electrical system comm procedure

x

COMMISSIONING PROCEDURE

ELECTRICAL SYSTEM

REVISION HISTORY

REVISION DESCRIPTION OF REVISION

A1 Issued for IDC

HOLD LIST

HOLD NO. SECTION NO. DESCRIPTION

1 5.0 Pre-Comm. & Comm. procedure for 220kV Switchyard

2 5.0 Pre-Comm. & Comm. procedure for 4MVA (EL-199030197-N05-0001) & 350 kVA (EL-199030197-N05-0002) DG Sets

TABLE OF CONTENTS

1.0 INTRODUCTION ................................................................... 5

1.1 General ............................................................................. 5

1.2 Overview - Electrical System ................................................... 5

1.3 Abbreviation ....................................................................... 6

1.4 Terminology ....................................................................... 8

2.0 ELECTRICAL SYSTEM DESCRIPTION ........................................... 9

2.1 System Voltage and Frequency ................................................. 9

2.2 Power Distribution ............................................................... 12

2.3 Switchgears ....................................................................... 13

2.4 Gas Turbine Generator (GTG) .................................................. 14

2.5 Transformers ..................................................................... 14

2.6 Motors ............................................................................. 15

2.7 UPSs ............................................................................... 16

2.8 Essential Diesel Generators (EDG) ............................................. 16

2.9 Lighting ........................................................................... 16

2.10 Electrical Heat Tracing / Heaters ............................................. 17

2.11 Power Factor Improvement .................................................... 17

2.12 IPCS/ENMS/SCADA ............................................................... 17

2.13 Cathodic Protection ............................................................. 17

3.0 GENERAL SCOPE OF COMMISSIONING PROCEDURE ........................ 19

4.0 GENERAL HEALTH, SAFETY AND ENVIRONMENT CONSIDERATIONS .... 20

4.1 General ............................................................................ 20

4.2 Compliance ....................................................................... 20

4.3 Health Hazards ................................................................... 20

4.4 Environment ...................................................................... 21

4.5 Pre-start Safety Checks ......................................................... 21

5.0 COMMISSIONING PROCEDURE ................................................. 22

5.1 Test Preparation/Prerequisite ................................................. 23

5.2 Tools and Test Equipment Required .......................................... 23

5.3 Control and Auxiliary Power Supplies ......................................... 24

5.4 Vendor Commissioning Assistance ............................................. 24

5.5 Energisation of UPSs ............................................................. 25

5.6 Energisation of Distribution Boards ........................................... 26

5.7 Power Cables ..................................................................... 27

5.8 Emergency Diesel Generators .................................................. 28

5.9 Commissioning of 220kV Switchyard .......................................... 32

5.9.1 Switchyard Configuration ....................................................... 32

5.9.2 Pre-energisation Checks ........................................................ 34

5.9.3 Order of Energisation ........................................................... 35

5.9.4 Energization of Switchyard ..................................................... 36

5.9.5 Synchronizing Grid Mains and GTG ............................................ 38

5.9.6 Energization of outgoing feeders .............................................. 39

5.10 Transformers and Switchgears ................................................. 40

5.10.1 Pre-Energisation Checks ........................................................ 40

5.10.2 Energisation of Transformers .................................................. 42

5.10.3 Energisation Switchgears ....................................................... 44

5.10.4 Functionality and Interlocks ................................................... 49

5.10.5 Switchgear Configurations ...................................................... 50

5.11 35kV & 10kV Overhead Lines ................................................... 52

5.12 Motors ............................................................................. 53

5.13 VSD/Soft Starters ................................................................ 53

5.14 PF Improvement Capacitors .................................................... 54

5.15 Gas Turbine Generator .......................................................... 54

5.16 Cathodic Protection ............................................................. 56

6.0 POST TEST STATUS ............................................................. 58

7.0 COMMISSIONING SUPPORT DOCUMENTS ..................................... 59

8.0 REFERENCE DOCUMENTS ...................................................... 60

1.0 INTRODUCTION

1.1 General

This document provides basic information, guidance and support documents to

carryout commissioning activities for the Electrical System at SYG in a

planned, safe and controlled manner.

This document shall be used in conjunction with the TMG specifications for

commissioning and the manufacturers or vendors documents and drawings.

In the mechanical completion/pre-commissioning phase, the Equipment,

Systems and Units are tested and prepared so that the system, etc., are in a

condition where they are ready for commissioning (RFC).

During Commissioning, the Electrical Equipment, Systems and Units are

energised and prepared to support the commissioning of other

systems/Companys Start-up schedule.

Commissioning includes activities that enable systematic and safe introduction

of power supply into the electrical system and verification of performance

parameters with the intended design, such as checks on Voltage, Phase

sequence, Man Machine Interfaces, Automatic Changeover scheme and

IPCS/ENMS/ICSS interfaces.

1.2 Overview - Electrical System

The Electrical system at SYG consists of Main intake power through two 220kV

OHL from Turkmen Energo National Grid. The outdoor 220kV, 3 phase, 3 wire

switchyard has 13 bays including above two OHL incomer bays from Mary SPS,

four outgoing OHL feeders of two each for CPF-2(CNPC) & future

development, four outgoing transformer feeders- two each for CPF-1 &

CPF-1A(Hyundai), one GTG Incomer, one Bus coupler and one Bus Transfer

breaker.

The estimated total electrical power requirement for CPF-1 is 85MW and

CPF-1A is 40MW. The 220kV power from Mary SPS is stepped down distributed

within the facilities at 35kV, 10kV and 400V voltage levels. The electrical

system at the facility includes transformers, GTG, motors, switchgears, UPSs,

EDGs, electrical heaters, heat tracing, cathodic protection, PF improvement

capacitors, lighting & power distribution.

During normal time, GTG is in standby mode keeping auxiliaries running.

During Mains failure or at the requirement of authorities, GTG will be made to

run. EDGs installed will come in line automatically during Mains failure and

serve all the emergency power requirement. Separate EDGs are installed for

CPF-1 as well as GTUs.

For centralised monitoring and control of electrical systems, IPCS and ENMS

are installed.

This document provides the commissioning procedure for the Electrical system

without compromising the safety and reliability.

1.3 Abbreviation

Abbreviation Description

AC Alternating current

AIS Air Insulated Switchgear

APFC Automatic Power Factor Controller

AVR Automatic Voltage Regulator

ACSR Aluminium Conductor Steel Reinforced

B/C Bus Coupler

BVS Block Valve Station

CB Circuit Breaker

CBCT Core Balance Current Transformer

CCR Central Control Room

CP Cathodic Protection

CPF Central Processing Facility

CPU Central Processing Unit

CT Current Transformer

DC Direct Current

EDG Emergency Diesel Generator

E/F Earth Fault

EMC Electromagnetic Compatibility

ENMS Electrical Network Monitoring system

ESD Emergency Shutdown System

FEED Front End Engineering Design

F&G Fire and Gas System

GCP Generator Control Panel

GIS Gas Insulated Switchgear

GTG Gas Turbine Generator

HMI Human Machine Interface


HSE Health Safety and Environment

HV High Voltage

HVAC Heating Ventilating & Air Conditioning

ICCP Impressed Current Cathodic Protection

I DMT Inverse Definite Minimum Time

I EC International Electrotechnical Commission

IP Ingress Protection

ICSS Instrumentation Control & Safety System

I/C Incomer

I/O Input/Output

IPCS Integrated Protection and Control System

IPCD Integrated Protection and Control Device

ITR Inspection and Test Report

JSA/JHA Job Safety Analysis/Job Hazard Analysis

LER Local Equipment Room

LV Low Voltage

MCB Miniature Circuit Breaker

MCCB Moulded Case Circuit Breaker

MCC Motor Control Centre

MCS Motor Control Station

MPR Motor Protection Relay

MVA Mega Volt Ampere

OHL Over Head Line

O/L Over Load

O/C Over Current

OCTC Off Circuit Tap Changer

OLTC On Load Tap Changer

PCP Permanent Cathodic Protection

PE Protective Earth

Pf Power Factor

PRC Power Factor Improvement Capacitor

PLC Programmable Logic Controller

RCD Residual Current Device

REF Restricted Earth fault

RMU Ring Main Unit

RMS Root Mean Square

RTCC Remote Tap Changer Cubicle

RTD Resistance Temperature Device

SACP Sacrificial Anode Cathodic Protection


SF6 Sulphur Hexafluoride

TCP Temporary Cathodic Protection

TEFC Totally Enclosed Fan Cooled

UPS Uninterrupted Power Supply

VCB Vacuum Circuit breaker

VDU Visual Display Unit

VSD Variable Speed Drive

VT Voltage Transformer

XLPE Cross Linked Polyethylene

VCU Vacuum Contactor Unit

1.4 Terminology

Term Definition

Procedure Specified directions or commands on how to undertake a particular task or series of tasks. A procedure generally comprises of a series of instructions presented within a specified sequence.

Instructions A description of an action to be undertaken generally forms part of a procedure.

2.0 ELECTRICAL SYSTEM DESCRIPTION

2.1 System Voltage and Frequency

Transmission and Primary Distribution System

220kV, 3ph, 3 wire, system neutral solidly earthed

HV distribution system: Central Processing Facilities (CPF-1)

35kV and 10kV, 3ph, 3 wire. 35kV earthed through Zigzag earthing transformer and 10kV neutral resistance earthed

Incoming supply to Gas Treatment Units (GTUs)

35kV, 3 ph, 3 wire

HV distribution system: GTUs 10kV, 3 ph, 3 wire, system neutral solid earthed

LV Distribution system for Gas Treatment Units (GTUs) and Wellheads.

400V, 3 ph, 4 wire, system neutral solidly earthed

Emergency Generation System (CPF-1)

10kV, 3 ph, 3 wire, system neutral resistance earthed

Emergency Generation System (GTU)

400 V, 3 ph, 4 wire, system neutral solidly earthed

Motors > 6000kW

10kV, 3 ph, 3 wire, system neutral resistance earthed (motors are supplied from 35 kV system using unit transformers with Dyn11 vector group)

Motors >150kW and < 6000kW 10kV, 3 ph, 3 wire, system neutral resistance earthed. Soft starter for above 1000 kW motors shall be used.

Motors > 0.18kW and < 150kW (All Motors)

400V, 3 ph, 3 wire, system neutral solidly earthed. Soft starter for above 100 kW motors shall be used.

Motors < 0.18kW 230V, 1 ph, system neutral solidly earthed

Motor operated valves 400V, 3 ph, 3 wire, system neutral solidly earthed

Lighting, convenience socket outlets, electrical trace heating, single phase power tools, single phase consumers etc.

400V, 3 ph, 4 wire/230V, 1 ph 2 wire + RE (TN-S system), system neutral solidly earthed

Welding socket outlets: 400V, 3 ph, 4 wire, system neutral solidly earthed

Escape lighting: 230V, 1 ph, (vital supply from UPS), system neutral solidly earthed

Power tools 230V, 1 ph, system neutral solidly earthed

Anti-condensation heaters 230V, 1 ph, system neutral solidly earthed

Heaters up to 3kW 230V, 1 ph, system neutral solidly

earthed

Heaters up to 250kW 400V, 3 ph, 4 wire, system neutral solidly earthed

Non vital instruments 230V, 1 ph, 2 core + RE, system neutral solidly earthed

Electrical ENMS and IPCS System 230V AC UPS

ICSS, ESD, F&G and other vital instruments:

230V, 1 ph, 2 core + PE, (vital supply from UPS), system neutral solidly earthed

Communication system for CPF-1, GTU & Wellheads

230V, 1 ph, (vital supply from UPS), system neutral solidly earthed

Communication system for pipelines:

230V, 1 ph, (vital supply from UPS), system neutral solidly earthed

Control/protection of 220, 35 & 10kV Switchgear HV switchboards (circuit breakers) and power transformers.

110V DC, unearthed (from UPS)

Circuit breaker spring charging motors for HV switchgear


Electrical control of HV motor starters (contactor feeders)


Electrical control of 400V motor starters

230V, 1 ph, solidly earthed

Fig. 1 - Key SLD with EDGs (Reference: SYG-PSH-04-EL-SLD-0001)

400A 400A 400A 400A 400A 400A 400A 630A

Bus A Earth

Switch

N/C

2000A

Bus E Earth

Switch

HV PF Improvement

Cap. Bank (1600 KVAR)

56" E

xpor

t

Gas

Pipeline

OHLSpare

For T

MG

(100

0 kV

A) M~M~

Mot

or F

eede

r

up to

1.6

MW

(Typ

)

Mot

or F

eede

r

abov

e 1.

6 M

W

(Typ

)

400A

M~

Mot

or F

eede

r

up to

1.6

MW

(Typ

)

400A400A400A400A

X1

400A

Spare

For T

MG

(100

0 kV

A)

400A

HV PF Improvement

Cap. Bank (1600 KVAR)

M~

M~

400A 400A 630A 400A 400A

Mot

or F

eede

r

abov

e 1.

6MW

(Typ

.)

Mot

or F

eede

r up

to 1

.6M

W (T

yp.)

Bus B Earth

Switch400A400A400A400A400A400A

Spare

ATS

For T

rans

form

er

Spar

e

For O

HL

Spar

e

220 kV Two Single Circuit

Overhead Line (OHL) to

CNPC (CPF-2)


Overhead Line (OHL) from

Turkmenenergo 220 kV MARY

SPS Switchyard for CPF-1


Overhead Line (OHL) for Power

Supply DevelopmentG GTG-1

400A

12.5/16 MVA

35/10.5 kV

Bus BBus E

Bus A

Motor

Feeder for

GTG starting

Motor Unit

Transformer

12.5/16 MVA

35/10.5 kV

GG

EDG

3.32 MW

10 kV

EDG

3.32 MW

10 kV

10 kV Switchgear

91-SS01-ES01

Loc: CPF-1 Main SS (04-SS01)

2SB101

Loc: SS-503

Inst. & SS Building-1 CPF-1A

35 kV GIS CB. 91-SS01-EP03


35 kV GIS CB. 91-SS01-EP02


Loc: 220 kV Switchyard Control Room

220 kV Air Insulated

Outdoor Switchyard

Loc: CPF-1, Switchyard

35 kV GIS 91-SS01-EP01

Loc: CPF-1 (Main SS) 04-SS01

15 kV

128.8 MW 0.8 PF

Transfer Bus

15/0.42 kV

Dyn11.

1.2 MVA

10/0.42 kV

Dyn11.

1.2 MVA

Main Bus II

Main Bus I

Generator

Transformer

230 kV/181 MVA

400V Aux. Switchboard

For 220 kV Switchyard

BAY 1 BAY 2 BAY 11 BAY 12 BAY 3 BAY 4 BAY 8 BAY 7 BAY 5 BAY 6 BAY 3 BAY 9 BAY 10

To GTG

Aux. MCC

1.2 MVA

Transformer

220/36.6 kV

100/125 MVA

Transformer

Bus Transfer

Bus Coupler

2.2 Power Distribution

Electrical power is supplied to the Turkmen Gas field from Mary SPS 220kV

grid by 2 single circuit overhead lines of 65km length. The outdoor 220kV, 3

phase, 3 wire switchyard has 13 bays including 2 Nos OHL incomer bays from

Mary SPS, 4 Nos outgoing OHL feeders of 2 each for CPF-2(CNPC) & future

development, 4 Nos outgoing transformer feeder for CPF-1 & CPF-

1A(Hyundai), 1 No GTG Incomer, 1 No Bus coupler and 1 No Bus Transfer

breaker

220kV OHL outgoing feeder conductors are terminated on the primary side of

the 100/125MVA 220/36.5 kV Transformers 91-SY01-ET01A/B (CPF-1) & 91-

SY01-ET02A/B (CPF-1A). Secondary side 35kV cables of the transformers of

CPF-1 are terminated at 35kV GIS Switchgear 91-SS01-EP01 and 35kV cables of

the transformers of CPF-1A are terminated at 35kV GIS Switchgear 91-SS01-

EP02 & EP03. Further distribution from 91-SS01-EP02 & EP03 are taken care by

Hyundai.

The Electrical energy required for the operation of the facility is met from the

Grid power during normal course of time. When grid fails or as and when

required by the authorities, the energy is supplemented by the Gas Turbine

Generator (GTG).

During Mains failure, the Emergency Diesel Generators (EDG) kept in standby

mode will automatically come in line and feed all the emergency services as

well as auxiliary power to GTG. As and when Grid/GTG power is available, the

power will be restored and EDGs will be kept in standby mode

The power is stepped down distributed within the facilities at 35kV,10KV and

400 Volts voltage levels. The electrical system at the facility includes

transformers, GTG, motors, switchgears, UPSs, EDGs, electrical heaters, heat

tracing, cathodic protection, PF improvement capacitors, lighting & power

distribution.

In the facility soft starters are provided for large motors (400V motors above

100kW and 10kV motors above 1000kW) to avoid voltage dips in the system

and to avoid heating of motors during starting.

GTUs 5,6,7 & 8 located farther from the CPF-1 are powered through 35kV OHL

from the CPF-1 Main SS, 04-SS01. 35kV is stepped down to 10kV at GTU and

feeds power to connected well heads as well as GTU. Well heads are

connected through 10kV OHLs and at GTU 10kV is further stepped down to

400V and distributed. A 350kVA 400V EDG installed at each GTU meets the

emergency power requirement of respective GTU

56 Export pipe line power requirements are met through 10kV OHLs powered

from Main SS, 04-SS01, 91-SS01-ES01 10kV switchgear

At Well heads and export pipe lines, 10kV is stepped down and distributed at

400V and do not have any EDGs


are installed. IPCDs mounted on the electrical feeders are interfaced with

IPCS/ENMS. The interface between IPCS/ICSS provide control and operation of

process feeders from CCR

2.3 Switchgears

Switchgears ranging from 220kV, 35kV, 10kV, and 0.40kV are installed in the

facilities. Except 220kV, all the switchgears are indoor and metal enclosed.

220kV switchgears are outdoor type AIS with SF6 circuit breakers. 35kV

Switchgears at CPF-1 are Gas Insulated (GIS) and at GTUs are Air Insulated

(AIS). 10kV switchgears are AIS type.

35 and 10kV circuit breakers are draw out type. Earthing switches are

provided in incoming and outgoing circuits. Suitable mechanical Castell

Interlock keys are provided to ensure that the circuits are isolated before

closing earthing switches and to ensure opening of earthing switches before

energising the circuits.

400V Switchgears are metal clad, fully withdrawable and double front (single

front panels with back to back arrangement) panels. Incomers are either ACBs

or MCCBs based on the rating and outgoing isolation is provided by MCCBs.

HV/LV Incomers, Bus sections and Outgoings are fitted with Intelligent

Protection Control Devices (IPCDs). IPCDs are programmable and have

communication facilities with IPCS/ENMS/ICSS for remote control and

operation. Interface between IPCS/ICSS enable the control of process feeders

from CCR. . Interface between IPCS/ENMS enable the control of switchgear

incomers/bus-sections from SS01.

2.4 Gas Turbine Generator (GTG)

The Gas Turbine Generator installed in the facility is for standby purpose and

is designed to the meet full load requirement of both CPF-1 & CPF-1A. The

15kV, 116MW, 0.8PF GTG is connected to the 220kV switchyard through a unit

step up generator transformer of 220/15kV, 115/165MVA. GTG control system

is designed operate the GTG either in parallel with the Grid or in islanded

mode. When running in parallel, the control system will allow set point

control of GTG output power.

GTG is a self contained complete package generating set and equipped with

necessary protection, control and monitoring. GTG can be operated either

from CCR remote GTG HMI (Remote- OWS) or from the local TCC HMI (Local

UCP). Also local control permits operations such as commissioning, trouble

shooting and maintenance. Operating Set points of the GTG can be

programmed from the GTG HMI

The 220kV switch yard has two main bus and one transfer bus. During normal

operation GTG & the feeders of CPF 1/1A are connected one main bus II. The

other bus (main bus I) is connected with the Grid incomers and third party

feeders. The 220kV bus-tie breaker will be normally closed.

2.5 Transformers

Transformers with ratings are used in the facilities. Primary side of all the

Transformers are connected through cables and secondary through cable/bus

duct based on the ratings. Transformers are provided with Inter-Trip and

necessary protection schemes. Operation and control part is discussed in the

subsequent section.

Except Main intake transformers at 220kV yard and GTU transformers, all the

other transformers are fitted with Off Circuit Tap Changing (OCTC) facility.

220/35kV Main intake transformers and 35/10.5kV step down transformer at

GTUs have On Load Tap Changing (OLTC) facility. The Remote Tap Changer

Control Panel (RTCC) for each transformer located in the SS operates the

motorised tap changing mechanism fitted on the transformers. Voltage

regulator equipped in the RTCC compares the transformer secondary voltage

with the set value and sends the signal, if the voltage is different from set

value, to the tap operating mechanism to increase or decrease the taps to

maintain the desired secondary voltage. RTCC has got

Master/Follower/Independent selection modes to operate in line with the

other transformer. This is also fixed with Local/Remote selection and Local

mode allows the operation taps in the transformer bay. Tap changing

mechanism can also be operated manually by the Handle exclusively provided

for this. Mechanical as well as Electronic tap position indicators along with

Voltage display in local and remote indication facilities are provided.

Main intake Transformers being Star/Delta connected, as the neutral is not

available for earthing, the earthing is derived through Zig-Zag transformer.

The star point of the Zig-Zag transformer in turn is earthed through Resistor.

All the other transformers have star connected secondary windings and their

neutrals are earthed either through resistors or solidly grounded.

2.6 Motors

10kV & 400V, 3phase and 230V single phase motors are used in the facility and

are of squirrel cage induction motors. Motors less than are equal to 0.18 kW

are supplied from 230V power supply. Motors above 0.18kW and less than or

equal to 150kW are 400V, 3 phase motors. Motors above 150kW are 10kV

motors. 400V motors above 100kW and 10kV motors above 1000kW are

provided with soft starters and the others are DOL type. 10kV motors with soft

starters and above 1600kW are VCB controlled or otherwise controlled with

Fuse & vacuum contactors. VSDs are provided for specific motors

LV motors are controlled and protected through MCCB/soft starters/VSDs.

MCCBs provide protection against S/C & O/L. Additional protections include

Thermal Image O/L, phase imbalance, Sensitive earth fault for motors above

30kw and locked rotor protection for EEx-e motors

HV motors are provided with MPR with CBCT and motors above 1600kW are

provided with differential protection.

Motors can be controlled locally through MCS, located adjacent to the motor.

Remote control of motor from ICSS is possible only when Auto mode is

selected in MCS. MCS selector switch is having OFF-AUTO-ON selection and

OFF position is lockable. Selector switch is having spring facility to return to

Auto mode from ON position when operator removes his hand.

IPCDs on the motor starter enables the motor to monitor/control from ICSS

through IPCS. ESD trip signals hardwired from the ICSS/ESD.

2.7 UPSs

110V DC UPS system is connected to Electrical Switchgear controls. DC UPS

consists of one set of battery, two sets of chargers and one set of integral DC

DB. One charger is supplied from normal power and other charger is input is

fed from emergency supply.

240V AC UPS System is connected to IPCS, ENMS, ICSS, ESD, F&G and Telecom

System. AC UPS systems consist of 2 set of single UPS with bypass supply and

battery. Normally the bypass input is fed from normal supply and the inverter

input is fed from Emergency Switchgears which in turn are fed from EDGs.

400V UPS is with 3 Phase output and is used for Emergency and Escape

Lighting in the CPF-1.This consists of single UPS with bypass supply and

battery

48V DC UPS system is exclusively used in the 220kV yard for PLC and RTU

applications

Batteries of all the UPS are located in a separate ventilated room with MCCB

isolation. All the UPS have integral DB at their output. UPSs having dual input

are fed normal and emergency switchgears. Emergency switchgears in turn are

fed by EDGs during Mains failure.

2.8 Essential Diesel Generators (EDG)

The Essential Power requirement at CPF-1 is met by 2 Nos. 3.32MW, 10kV, 50%

rated EDGs. Apart from essential process loads, Instrument Air Compressors,

GTG starting motor, GTG auxiliary supply, fire water jockey pumps,

emergency and escape lightings, UPSs and essential HVAC units are other

essential loads connected with the EDG switchboards.

All GTUs and Rotational camp have their exclusive 400V, 350kVA EDGs

connected to their respective switchgears.

EDGs on Auto mode will start against Mains failure have Auto/Manual

provisions for Changeover, Synchronising, Mains restoration along with Test

Trial Run facilities.

2.9 Lighting

Apart from general plant and indoor lighting, essential and emergency/escape

lightings are provided. Essential lightings are fed from EDGs.

Emergency/escape lights are fed from lighting UPS or in-built battery backup.

2.10 Electrical Heat Tracing / Heaters

Heat tracing avoids condensation of process gas in the pipelines and

Instrumentation and maintains the temperature as specified in the design.

Heating is carried out with Self regulating heat tracing cables with line sensing

thermostats. Heaters operate at 230V AC supply and distributed through

respective Distribution Boards. Part of the heat tracing circuits are fed

through Emergency DBs based on the requirement

Electrical heaters installed in the facility are either controlled through

contactors or thyristor. Heaters have hardwired control from ICSS and

additionally thyristor heaters have 4-20mA set point control

2.11 Power Factor Improvement

As system power factor need to be maintained at 0.98 lagging, PF

improvement capacitors are installed in the facility. Both 10kV & 400V

capacitors are installed in the facilities. 10kV Capacitors are outdoor type and

IP54. Ratings above 500kVAR will have two step control through APFC

controller.

LV capacitors have multiple step controls and are indoor type and IP41. Once

again step control is achieved through APFC controllers.

2.12 IPCS/ENMS/SCADA


are installed. IPCDs mounted on the electrical feeders are interfaced with

IPCS/ENMS. The interface between IPCS/ICSS provide control and operation of

process feeders from CCR

35 kV, 10kV and 400V Switchgear incomers and bus tie can be controlled

either locally in front of the panel or remotely through ENMS OWS. For ENMS

operation, the remote mode shall be selected on the switchgear

TurkmenEnergo will control the 220kV switchyard CBs through SCADA. GTG

incomer and bus tie CBs will be controlled from GTG UCP

2.13 Cathodic Protection

To prevent corrosion of the buried pipelines, tanks, vessels and structures,

Cathodic protection is installed throughout the plant depending on the

requirement.

CP system is designed and installed considering site condition, soil resistivity,

service (water, hydro carbon etc.), MOC, Interaction and Induced effects from

foreign service crossings, parallelisms and buried/overhead transmission

electrical power lines.

The two main types of CP are Impressed Current and Sacrificial Anode.

Impressed Current CP requires continuous power from the mains which in

turn, stepped down through transformers and converted into DC through

rectifiers and connected. Sacrificial anode requires no power.

Infield & export pipe lines and tank external surfaces are protected by

Impressed Current Cathodic protection. Mix of both Impressed and Sacrificial

anode CP are used in in-plant buried pipe lines, hydrants and tank internals

Temporary CP using sacrificial anode system is installed while laying the

pipelines and will be disconnected while commissioning the Permanent CP

system using Impressed Current.

3.0 GENERAL SCOPE OF COMMISSIONING PROCEDURE

The section provides basic information, guidance and support documents to

carryout commissioning activities of the electrical system including HV/LV

switchgears, transformers, cables, motors, VSDs, UPS, distribution boards and

lighting system.

During the pre-commissioning , all the equipment are tested and prepared to

keep in a condition ready for commissioning.

During Commissioning, the Equipment, Systems and Units are prepared for

Ready for Startup (RFSU) and this will be in a sequence that supports the

facilitys Startup schedule.

Commissioning includes activities that enable systematic and safe introduction

of power supply into the electrical system and verification of performance

parameters with the intended design, such as checks on Voltage, Phase

sequence, Man Machine Interfaces, Automatic Changeover scheme, IPCS/ENMS

and IPCS/ICSS interfaces.

4.0 GENERAL HEALTH, SAFETY AND ENVIRONMENT CONSIDERATIONS

4.1 General

HSE assurance is provided by identifying and managing HSE risks, according to

the principles of risk tolerance, risk reduction and continuous performance

improvement. All employees are responsible for complying with the TMG

Safety Guidelines. Safe work practices are discussed and followed prior to

starting any activity

4.2 Compliance

All personnel familiarise themselves with the safety rules and guidelines

provided in TMG HSE guidelines.

4.3 Health Hazards

Shock and Fire/Explosion Hazards

Mitigate possibilities of the hazards by following correct procedure, systemic

approach and by using correct PPE and additional PPE:

Eye: Handling Electrolyte of the batteries may cause physical damage

Skin Contact: Contact with Electrolyte may cause irritation and burns of

exposed area.

Contact with Hazardous Voltage: Contact with live electrical parts can cause

mild shock to fatality, depending on path of the current flow through the body

and other factors such as sweat, moisture, body resistance, level of voltage

etc.

First Aid

Eye: Wash thoroughly with water immediately. Repeat as needed till the

irritation subsides. If irritation persists, consult medical personnel.

Skin Contact: Wash with clean water till the irritation or pain subsides.

Contact with Electric Voltage: Isolate power supply, remove the victim from

the equipment contact and perform first aid if needed, call for medical help

Systemic and Other Effects: Mild shock, burns, shivering, de-hydration and

fatality

Personnel Protection

Eye Protection: Safety glasses with side shield should be worn and eye wash

arrangements should be available.

Skin Protection: Acid resistant gloves, Apron, Boots.

Protection Equipment (for Electricity): Depending on the voltages, Gloves,

Boots, insulation mats, voltage detectors, insulated tools, etc., are

recommended to be worn and used.

4.4 Environment

The Electrical substations, GTG, EDGs, Switch yards and the surroundings shall

be well protected, clean and dry.

4.5 Pre-start Safety Checks

Before starting any activity the minimum required safety checks are followed

and approval from the supervisors/Engineers and relevant inter discipline

engineers is obtained.

Prior to any electrical activity, ensure the following safety items in place:

1. Safety signboards

2. Escape route markings

3. Emergency exit lighting

4. Electrical emergency safety equipment

5.0 COMMISSIONING PROCEDURE

Commissioning involves energisation of electrical equipment and system.

Commissioning is to be taken up only after the completion pre-commissioning

activities. The procedure outlined in the following sections describes activities

involved during commissioning

Commissioning includes test preparation, energisation and demonstration as

explained below:

A. Test Preparation

The individual equipment or components such as switch gears, cables,

transformers etc., of the electrical system considered for commissioning are

already tested during pre-commissioning whereas the commissioning test

preparation is the preparation of the electrical system as a whole with its

interfaces, controls, interlocks, etc.

The test preparation may include the following depending on the position of

the system in the overall electrical system:

1. Preparation of safety equipment

2. Preparation of test equipment and tools

3. Isolation and locking of outgoing feeders of the equipment

4. Energisation of control circuits

5. Energisation of the upstream side of the equipment

B. Energisation and Demonstration

After the system is made ready for its first energisation, the equipment will be

energised following a detailed step-by-step procedure which is included in this

procedure or the one that is provided by the manufacturer/vendor. The

electrical equipment is energised for the first time and kept energised for a

significant period so that any abnormality may be discovered and problems

identified may be rectified.

After the equipment is energised, the live testing of the system commences.

The live test sequence is provided below:

1. Check the voltage presence and value

2. Check all controls on the equipment

3. Check interfaces and indications

4. Check the phase sequence of the supply voltages, where applicable

5. Verification of the main equipment (example: Transformers) of the

Electrical Distribution System for its mechanical aspects by monitoring and

taking required readings during soaking period after energisation.

a. Noise

b. Equipment vibration

c. Oil leaks, where applicable

d. Temperature readings

5.1 Test Preparation/Prerequisite

The following are the prerequisites of the equipment and system:

1. Ensure the availability of competent and authorised Commissioning

Engineer for the activities

2. Ensure that all the required documents such as marked-up drawings,

PetroPCS-B check sheets, etc., are available.

3. Ensure that the available documents are the latest "As built" mark-

ups/Latest revision.

4. Ensure that safety and fire fighting systems are ready for use.

5. Barricade the area with barrier tape and place warning signs to prevent

entry by unauthorised personnel.

6. Ensure that the required Isolation Certificates, Limitation-of-Access and

Sanction-for-Test are obtained specific to the equipment.

7. Ensure availability of Approved switching program for Electrical Switching

Activity

8. Ensure that the Electrical Permit to Work is obtained,

9. Ensure that the TRA is complete and available for the activities

10. Conduct Tool Box Talk prior to the commencement of activities for the

day.

11. Ensure that the surroundings and the equipment are clean, tidy and are

accessible without any obstruction.

12. Ensure that the radio and alternate communication is available.

13. Ensure that the earthing system testing is complete

14. Ensure that the Control and auxiliary power supplies are available

15. Ensure that the temporary power for auxiliary/control, essential lighting

and HVAC are available

5.2 Tools and Test Equipment Required

1. Megger 500V, 1000V, 2500V, 5000V (AC/DC)

2. Multimeter

3. Clamp meter for AC/DC Current measurement

4. Phase rotation meter

5. Galvanometer

6. Arc Flashing Jacket Kit (If applicable in PTW)

7. Hot stick

8. IR Temperature Gun

9. Insulated hand tools, Rubber gloves

10. 3 Phase, 400V AC Supply

11. Lux meter

12. Electrical discharge device

5.3 Control and Auxiliary Power Supplies

220kV, 35kV, 10kV, 400V switchgears control & protection

110V DC

Electrical control of HV motor starters- Contactor feeders

110V DC

Spring Charging motors of HV switchgear 110V DC

400V motors feeder controls 230V AC

Switchgear anti-condensation heating, cubicle lighting

230V AC

IPCS/ENMS 230V AC

ICSS, ESD, F&G and other vital Instrumentation 230V AC

Communication systems 230V AC

Switchgear control supply 110V DC is supplied by 110V DC UPS system.

230V/400V auxiliary supplies are derived from Substation Miscellaneous DBs.

IPCS/ENMS/ICSS/F&G/ESD/Instrumentation and Telecom are powered from

230V AC UPS.

Along with the above, Lighting and HVAC DBs need to be initially energised

with temporary power supply in the respective substations to enable

commissioning of the electrical distribution systems.

The above equipment will be switched over to normal power supply after the

commissioning of the upstream side equipment is completed. With the normal

power supply, the above equipment has to be fully commissioned and

functionalities have to be demonstrated as per the relevant procedures.

5.4 Vendor Commissioning Assistance

Vendor commissioning assistance may be utilized for commissioning the

following systems:

220kV switchyard

Switchgears and MCC

Protective Relays

Power Transformers

UPS / Battery System

Soft starters/VSDs

Emergency Diesel Generator

Gas Turbine Generator

5.5 Energisation of UPSs

UPSs and DBs provide control and auxiliary power supply to the Switchgear.

These systems need to be commissioned prior to the main equipment of the

substation. These systems are already commissioned using a temporary source

of power supply in order to make the upstream side equipment available.

When the normal power switchgear which are going to feed the UPSs/DBs are

ready, re-commissioning of UPS shall be carried out as per the vendors

procedure having completed the necessary checks.

Note:

Commissioning of the UPS system will be with the vendors support.

Commissioning reports and checks shall be as per the vendor formats.

UPSs with dual input power supply and bypass supply shall be tested for their

operability while re-commissioning.

Interface facilities with IPCS/ENMS/ICSS shall be verified.

A. DC UPS

Step Actions Sign/Date

1. Ensure that all Pre-requisite checks are completed

2. Carryout Megger test on the system before energising

3. Ensure that all checks required as per vendor commissioning procedure are completed

4. Switch on the feeders on Incoming power supplies to rectifiers and verify voltage and phase rotation

5. Check indications/meter readings/alarm/abnormal noise/temperature

6. Ensure operation of Unit Cooling Fans

7. Energise the DC Distribution Board

B. AC UPS

The following AC UPS is to be commissioned. Ensure that the pre-

commissioning activities are completed before taking up commissioning.




3. Ensure that all checks required as per vendor commissioning procedure are completed

4. Switch on the feeders on Incoming power supplies to rectifiers and verify voltage and phase rotation

5. Check indications/meter readings/alarm/abnormal noise/temperature

6. Ensure operation of Unit Cooling Fans

7. Switch ON Inverter and check output Voltage & Frequency

8. Check Inverter synchronism and by-pass modes

9. Energise the AC Distribution Board

5.6 Energisation of Distribution Boards

Distribution boards are tested during the pre-commissioning phase itself and

further following shall be ensured before energizing the DBs.

A. Lighting (Normal & Essential) DBs

The Lighting Distribution Boards are commissioned following the steps, after

completing pre-commissioning activity of the system.




3. Ensure arrangement of lighting fixtures/sockets against approved drawing.

4. Energize the Distribution Board.

5. Verify all lighting fixtures are working/verify correct voltage and phase sequences in the sockets.

6. Check and record lighting intensity level and lighting projection points.

7. Simulate and check the operation of timers/photocell switches (as applicable).

8. Allow Emergency and escape lighting (in built battery fixtures) for initial charge, disconnect the supply and verify the operation of lighting fixtures.

B. Miscellaneous Power & HVAC DBs


1. Ensure that all Pre-requisite checks are completed.

2. Carryout Megger test on the system before energising.

3. Energize Distribution Board.

4. Ensure Indicating lamps are working

5. Verify correct voltage and phase sequences.

6. Ensure DB ON status at IPCS/ENMS/ICSS

C. Heat Tracing & MOV DBs

The Heat Tracing and MOV Distribution Boards are commissioned following the

steps, after completing pre-commissioning activity of the system.




3. Energize Distribution Board.

4. Ensure Indicating lamps are working

5. Verify correct voltage and phase sequences.

6. Ensure DB ON status at IPCS /ENMS/ICSS

7. Ensure Atmospheric thermostat is connected and set for Automatic operation of Heat Tracing

8. Ensure Auto/Manual/Off selector function is working properly for Heat Tracing

9. Ensure ON status at IPCS for each MOV outgoing feeder

10. Ensure Space heater is working

11. Ensure Indicating lamps & measuring circuits are in order

5.7 Power Cables

All the HV/LV/Control Cables are tested during pre-commissioning phase itself

and further they may be ensured for the following:


1. Ensure that all the cables are tested and relevant ITRs are available

2. Ensure that the tests specific to 220kV cables are carried out before energising

3. Ensure all the 35kV, 10kV HV Power cables are tested


4. Ensure that the control cables are checked

Note:

Commissioning of the 220 kV Cables will be with the vendors support.

5.8 Emergency Diesel Generators

Following are the Emergency Diesel Generators (EDGs) installed in the facility

Location Rating EDG Tag Number

Downstream Switchgear Tag

Number

CPF-1 10kV, 4.15MVA, 50Hz 99-SS01-EG01 91-SS01-ES01, Bus E

CPF-1 10kV, 4.15MVA, 50Hz 99-SS01-EG02 91-SS01-ES01, Bus E

GTU-5 400V, 350kVA, 50Hz 99-SS51-EG01 91-SS51-EL01, Bus C




Note:

Commissioning of EDG will be with the vendors support. Commissioning

reports and checks shall be as per the vendor formats.

Fig. 2 - Key SLD with EDGs at CPF-1 (Reference: Key SLD SYG-PSH-04-EL-SLD-0101 CPF-1 Main S/S)

Motor Feeder

M~

M~

M~

Power

Feeder

Power Factor

Improvement

Capacitor Bank

Motor Feeder

Power

Feeder

Motor Feeder

Power

Feeder

Power Factor

Improvement

Capacitor Bank

NC

BUS A10kV

91-SS01-ES01

91-SS01-ET01A

35/10.5 kV

12.5/16 MVA

NO NC

BUS B BUS C

ATS+AMF

G~

G~

ATSATS

NC

91-SS01-ET01B

35/10.5 kV

12.5/16 MVA99-SS01-EG01

10 kV, 4150 kVA

99-SS01-EG02

10 kV, 4150 kVA

Power

Feeder

Power

Feeder

NO NO

Fig. 3 - Key SLD with EDG at GTUs Typical (Reference: Key SLD SYG-PSH-04-EL-SLD-0534 GTU-5)

Motor Feeder

M~

M~

M~

M~

M~

Power

Feeder

LV Power

Factor

Improvement

Capacitor Bank

Motor Feeder

Power

Feeder

VFD FeederMotor Feeder

Power

Feeder

VFD FeederLV Power

Factor

Improvement

Capacitor Bank

G~

MCCB MCCB MCCB MCCB MCCB MCCB MCCB MCCB MCCB MCCB

NCNC

BUS A400V

91-SS51-EL01

91-SS51-ET02A

10/0.42kV, 1.6 MVA

91-SS51-ET02B

10/0.42kV, 1.6 MVA99-SS51-EG01

350 kVA, 400V EDG

NO NC

BUS B BUS C

ATS

EDGs are tested and commissioned during pre-commissioning phase itself and

further they may be ensured for the following



2. Ensure that all the piping, valves and instruments in the system are lined up.

3. Ensure that IPCS/ENMS/ICSS/F&G system are in line and functional.

4. Ensure system is free from leaks and spillage.

5. Breathing and draining devices are satisfactory.

6. Ensure that gas/flame/heat detectors are fixed and connected properly.

7. Switch on auxiliary and control power supply.

8. Ensure that the control/starting battery (starting battery is only for GTU sets and CPF-1 EDGs are Air start) is getting charged

9. Ensure that all Electrical, Instrumentation, other controls and protections are in order and lined up.

10. Ensure that all the safety controls such as thermostats, engine governor, automatic voltage regulator and protections are set to their values and tested.

11. Select the manual mode

12. Set the Governor just above the idle speed

13. Set the excitation to minimum

14. Give the start command from the engine control panel

15. Air motor (CPF-1 EDGs) / Battery (GTU EDGs) cranks the engine and engine picks up speed and runs at idle speed

16. Observe all the parameters such as speed, vibration and temperature

17. Observe any abnormal noise from the engine

18. If satisfied, increase the speed slowly up to normal speed (1000 RPM for CPF-1 EDGs & 1500 RPM for GTU EDGs) and monitor continuously.

19. Increase the excitation gradually and record alternator voltage versus excitation current to conduct open circuit tests.

20. When the engine reaches operating speed, observe other parameters including the above and additionally voltage, current, frequency, etc.

21. Check the phase rotation with the grid

22. If required, adjust AVR for voltage adjustment and speed for frequency


23. Switch on the loads with 25%, 50% and 75% each with 15 minutes duration and record all the parameters

24. Connect 100% load and observe for 4 Hrs and record all the parameters

25. Check ventilation and CB interlocks

26. With the maximum load on the engine, leaving cushion for the highest rated motor to start, start the highest rated motor and observe.

27. Connect 110% load and observe for 1 Hr and ensure that the parameters are within the limits.

28. After restoration of power, switch off the EDG.

29. Check the timing for auto start, auto close of EDG CBs, Interlock between EDG & Mains CBs, auto Mains restoration and auto stop of EDGs.

30. Check synchronisation between the EDGs, Grid synchronisation ( as applicable)

31. Check interface at IPCS/ENMS/ICSS

5.9 Commissioning of 220kV Switchyard

220kV Switchyard commissioning is package vendors scope and following may

be ensured prior to energising.

5.9.1 Switchyard Configuration

Description Quantity Bay Nos. Normally

Connected to

Bus sections Main Bus I, II & Transfer Bus

- -

Grid Incomers OHL-3 & 4 5&6 Main Bus I

220kV 3rd party OHL O/Gs OHL1 &2 1&2 Main Bus I

220kV Future OHL O/Gs OHL-5 &6 9&10 Main Bus I

220kV O/Gs 2 Nos CPF-1 3&4 Main Bus II

220kV O/Gs 2 Nos CPF-1A 11&12 Main Bus II

GTG Incomer 1 No 13 Main Bus II

Bus Coupler 1 No 8 Normally Closed

Bus Transfer 1 No 7 -

Fig. 4 220 kV Switchyard (Reference: SYG-PSH-04-EL-SLD-0001)

5.9.2 Pre-energisation Checks


1. Ensure that all the isolators are checked and available for operation

2. Check and confirm that the incomer breaker is ready and its spring is charged.

3. Ensure that earthing connections have been reinstated after the pre-commissioning tests.

4. Ensure that the busbar earth switch, bus coupler earth switch and cable side earth switch are kept open and locked with safety pad lock (wherever applicable).

5. Ensure all outgoing feeders of the 220kV yard are isolated and locked.

6. Ensure that the upstream side equipment is commissioned and is ready to energise the downstream equipment.

7. Ensure that the CT shorting links are reinstated after the pre-commissioning test; ensure that connections are tight.

8. Ensure that the protection relays and their settings are correct.

9. Ensure that all Voltage Transformer fuses are healthy and the earth connections are correct

10. Ensure that the control and auxiliary power supply 110V DC/48V DC/400V AC are available.

11. Ensure that the PLCC & Teleprotection panels are lined up for the OHL feeders

12. Ensure that communication systems, SCADA & RTU, relay protection and emergency control systems between CPF-1 220kV switchyard and Mary SPS, Maryenergo & Turmenenergo are ready as applicable

13. Ensure that the communication between 220kV yard SCADA and ENMS are ready.

14. Ensure that the preparatory checks/steps given in vendor procedures and commissioning manual are carried out.

15. Ensure clearance from Mary SPS/Turkmen energo to enrgise the yard

16. Inform control room about the energisation

17. Keep all the other isolators, CBs in Off position

18. Ensure all the other isolators are open and not earthed

19. At every stages of energisation, observe for any abnormality and take corrective action as required.

20. Ensure availability of status indication of


Isolators/CBs at yard control room/ENMS for every operation

5.9.3 Order of Energisation

The following order shall be applied for initial energisation of the switchyard:

A. Energization of 220kV Switchyard

Energization of Switchyard Main Bus-I & Main Bus-II from OHL-3, OHL-4 & GTG (Single feeder to Switchyard as per the Procedure 5.9.4).

Energisation of 220kV switchyard through OHL-3

1. Dead bus closing to Main Bus-I

2. Dead bus closing Bus coupler to Main Bus-II

3. Dead bus closing to Transfer Bus

4. Open Transfer Bus CB

5. Open OHL-3 CB

Energisation of 220kV switchyard through OHL-4

1. Dead bus closing to Main Bus-I (As Bus coupler already closed, Main

Bus-II also gets energized)

2. Open OHL-4 CB

Energisation of 220kV switchyard through GTG

1. Dead bus synchro to Main Bus-I (As Bus coupler already closed, Main

Bus-II also gets energized)

2. Open GTG CB

3. Open bus coupler

B. Energization of Switchyard with OHL-3, OHL-4 and Synchronizing with

GTG (as per Procedure 5.9.5)

1. Dead bus closing to Main Bus-I through OHL-3

2. Closing OHL-4 after synchro check with OHL-3

3. Start GTG and energise Main Bus-II

4. Synchronize GTG with Main Bus-I through Bus-coupler

5. Switch Off GTG and keep in standby

6. System is ready

C. Energization of Switchyard outgoing feeders with OHL-3 & OHL-4 (as per Procedure 5.9.6)

1. Ensure Transformers are ready for energisation

2. Energise Transformers one by one

3. Energise OHL bay -1&2 only after obtaining approval and switch off

when not required

4. Energise OHL bay - 5 &6 only after obtaining approval and switch off

when not required

5.9.4 Energization of Switchyard

Energization of Switchyard Main Bus-I through OHL-3, OHL-4 & GTG (Single

feeder to Switchyard) and ensure clearance for energizing.


A. Energization of Switchyard Main Bus-I through OHL-3

1. Confirm that all the Pre - energisation checks are completed as per relevant section of section 5.9.2


3. Check for presence of 110V DC/48V DC/400V AC control supply to the control circuits.

4. Ensure that communication systems, telemetry, relay protection and emergency control systems between220kV switchyard and Mary SPS, Maryenergo & Turmenenergo are ready as applicable

5. Ensure that the inter panel wiring, Metering panel, Control panel, Relay panel, PLC Panel, SCADA Panel wiring are tested

6. Ensure that all the Isolators, CBs and Earth switches are open

7. Check that the indication lamps are healthy by using Lamp Test Switch.

8. Ensure that the close/open interlocks of all the isolators, CB and earth switches are tested and verified

9. Ensure that the closing spring of the CB of OHL-3 is charged

10. Ensure that all the conditions required for closing the CB of OHL-3 are satisfied

Bus-I not earthed

CB Mechanism healthy

Protective relays are healthy

Line & Bus earth switches are open

Trip & Closing coil supervision circuits are healthy

Ensure trip from Distance protection, Backup distance protection and line differential are not active

Ensure carrier inter trip protections are not active


Ensure bus bar protection is not active

Ensure no Phase Under Voltage is active

11. Ensure all checks recommended by the vendor for energization of the yard are completed.

12. Check with upstream CB for close permissive/inhibits/Inter trip as applicable

13. Check CB tripping by Remote through SCADA

14. Ensure that the Surge arrestors, CVTs & Line traps are lined up and yard is ready to receive the power

15. Ensure availability 220kV Power supply from Mary PP-1

16. Switch ON the MCBs for OHL-3 and Main Bus-1 to get 110V AC PT voltage to metering and protection.

17. Check presence of voltage on all three phases on Metering and Protective Relays

18. Check Phase sequence from line VT secondary three phase voltage and record (Normal/Clockwise)

19. Turn OHL-3 CB selector to S 453 to Local position

20. Ensure synchro permissive from distance relay

21. Close the Isolator Q9 of OHL-3 and observe for any abnormality

22. Close the Isolator Q1 of OHL-3

23. Close OHL-3 Circuit Breaker Q0 through S0 and this energises Main Bus-I and observe for any abnormality and carryout corrective action, if required

24. Check interface signals are correct

B. Energisation of Main Bus-II through Bus Coulper

1. Ensure Bus-coupler and Main Bus-II are ready for energisation

2. Close Main Bus-I VT Isolator Q3-A08 and availability of three phase Voltage and record phase sequence (Normal/Clockwise)

3. Close the isolator Q1-A08 of BC and observe for any abnormality

4. Close the isolator Q2-A08 of BC

5. Close the CB Q0-A08 of BC, energise Main Bus-II and observe for any abnormality

6. Close Main Bus-II VT Isolator Q3-A08 and availability of three phase Voltage and record phase sequence (Normal/Clockwise)


C. Energisation of Transfer Bus through Main Bus-1

1. Ensure that the Transfer Bus is ready for energisation


2. Close the isolator Q1-A07 and observe for any abnormality

3. Close the isolator Q7-A07

4. Close the CB Q0-A07, energise Transfer Bus and observe for any abnormality

5. Check Transfer Bus VT and availability of three phase Voltage and record phase sequence (Normal/Clockwise)


7. Open CB Q0-A07, then isolator Q1-A07 & Q7-A07 and de-energise the Transfer Bus

8. Earth the Transfer Bus through Earth Switch Q72-A07, later open earth switch

9. Open CB Q0-A08, then isolator Q1-A08 & Q2-A08 and de-energise the Main Bus-II

10. Earth the Main Bus-II through Earth Switch Q11-A08, later open earth switch

11. Open CB Q0-A05, then isolator Q1-A05 & Q2-A05 and de-energise the Main Bus-I

12. Earth the Main Bus-I through Earth Switch Q11-A05, later open earth switch

D. Energization of Switchyard through OHL-4

1. Follow steps 1 to 43 with respective Isolators & CB

2. Check the phase sequence and compare the same with OHL-3 phase sequence and ensure that they are same

E. Energization of Switchyard through GTG

1. Start GTG and ensure availability of Voltage

2. Follow steps 1 to 43 with respective Isolators & CB as applicable

3. Check the phase sequence and compare the same with OHL-3 phase sequence and ensure that they are same

5.9.5 Synchronizing Grid Mains and GTG

Grid Incomers paralleling and Synchronising with GTG requires prior approval

from Mary PP and Turkmen Energo. Grid incomers shall be tested and

paralleled later GTG shall be synchronised. Ensure that the GTG is already

tested and ready for energizing and loading.


1. Energise Main Bus-I through OHL-3 and record the VT phase sequence (Normal/Clockwise)


2. Record the VT phase sequence of OHL-4 (Normal/Clockwise)

3. Compare phase sequences of OHL-3 & OHL-4, across voltage on the same phase shall be zero and cross voltages between the phases shall be 110V

4. Ensure synchro check permissive through distance relay to close CB of OHL-4

5. Close CB of OHL-4 and observe for any abnormality

6. Run GTG and Energise Main Bus-II through GTG and record the VT phase sequence (Normal/Clockwise)

7. At Bus-coupler VTs compare Voltage and phase sequence of OHLs and GTG. Across voltage on the same phase shall be zero and cross voltages between the phases shall be 110V

8. Ensure synchro check permissive through distance relay to close CB of Bus-coupler

9. Close Bus-coupler CB and observe for any abnormality

10. Ensure that there is no abnormal circulation current at the bus-coupler ammeter

11. Switch Off GTG CB and connected Isolators and switch off GTG

12. Record all the details

13. Now the 220kV yard is ready for energising outgoing feeders and loading

5.9.6 Energization of outgoing feeders


A. Energisation of Transformer feeders

1. Main Bus-I is energised through OHL-3 & OHL-4 and Main Bus-II is energised through closed Bus coupler

2. Ensure that 220kV Yard is and ready and clearance available for loading

B. Energisation of Transformer feeder A-11 (CPF-1A HEC)

1. Ensure that the pre-energisation checks on Transformer is completed as 5.9.2

2. Ensure that the Transformer and connected downstream switchgear is ready to receive the power

3. Ensure that the secondary side CB and earth switches of the transformer are open in the switchgear

4. Close the isolator Q2-A11 and observe for any


abnormality

5. Close the isolator Q9-A11 and

6. Close the CB Q0-A11 and observe for any abnormality

7. Ensure that all the position indicators are correct with respect to actual position of the Isolators/Circuit Breakers

8. Ensure that the indicating lamps are showing the correct status

9. Ensure status indications of Isolators/CBs in SCADA/ENMS

C. Energisation of Transformer feeders A-12 (CPF-1A HEC), A-3&A-4 (CPF-1)

1. Repeat steps with respective isolators & circuit breaker of the concerned transformer

D. Energisation 3rd party outgoing OHL feeders

1. Energisation 3rd party outgoing OHL feeders is with Turkmen Energo and this is to be done as per their requirement

5.10 Transformers and Switchgears

5.10.1 Pre-Energisation Checks

A. General

The sequence of energisation of the equipment is listed below:

(The following commissioning description is shown for switchgear having two

bus sections and a normally open bus coupler. The same logic can be extended

for commissioning other type of switchgears by applying their respective

configurations. The pre-energisation checks applicable to Transformers shall

be followed to commission NETs)

Transformers with their respective NET/NER

Bus Section A

Bus Section B

Bus Coupler

B. Pre-energisation Checks on Transformers


1. Check and confirm that the oil level is correct in the conservator tank

2. Ensure that the upstream side panel is commissioned and the breaker is ready to energise the downstream


equipment

3. Ensure that the secondary side circuit breaker is isolated and locked

4. Ensure that earthing connections and NET/NER connections (where applicable) are reinstated correctly after pre-commissioning tests

5. Ensure that the tap setting of the transformer is in normal tap and pad locked

6. Ensure that all radiator valves are open

7. Ensure that CT shorting links are reinstated in Marshalling kiosk and in panels after pre-commissioning tests

8. Ensure that CT circuit connections are tight

9. Ensure that the auxiliary supply to the transformer is on and the indications are working correctly

10. Ensure that protective relays are set as per relay co-ordination documents

11. Ensure that Alarm and Trip settings of transformer Winding and Oil temperatures are set as per the vendors recommendations

12. Check the condition of silica gel breather and record the colour

13. Ensure that the any other preparatory checks/steps given in vendor procedure/commissioning manual are carried out

C. Pre-energisation Checks on Switchgears


1. Check and confirm that the incomer breaker is in service position and its spring is charged.

2. Ensure that earthing connections have been reinstated after the pre-commissioning tests.

3. Ensure that the busbar earth switch, bus coupler earth switch and cable side earth switch are kept open and locked with safety pad lock (wherever applicable).

4. Ensure all outgoing feeders of the Switchgear are isolated and locked.

5. In case of HV Switchgear, all the outgoing feeders shall be racked out to Test/Isolated position; busbar shutters/cable side shutters shall be locked with safety padlock and doors shall be closed and locked.

6. In case of 400V Board with non-isolatable type feeders, all the fuses in the outgoing feeders shall be removed and fuses shall be duly marked with feeder


numbers.

7. Ensure that the upstream side equipment is commissioned and is ready to energise the downstream equipment.

8. Ensure that the CT shorting links are reinstated after the pre-commissioning test; ensure that connections are tight.

9. Ensure that the protection relays and their settings are correct.

10. Ensure that all Voltage Transformer fuses are healthy and the earth connections are correct

11. Ensure that the Bus Coupler Breaker is open and in isolated position

12. Ensure that IPCS/ENMS/ICSS are ready and communicating to the Switchgear.

13. Ensure that the control power supply 110V DC/230V AC (UPS) /230V AC (wherever applicable) are on and the indications are working; verify the control supply voltages using a Multi-meter.

14. Ensure that the preparatory checks/steps given in vendor procedures and commissioning manual are carried out.

5.10.2 Energisation of Transformers


1. Confirm that all the preparatory works are completed as per Section 5.10.1-B, Pre-energisation checks.

2. Ensure the presence of primary power supply at the upstream Switchgear and the supply is within the tolerance limits.

3. Ensure that the secondary side Circuit Breaker of the Downstream Switchgears in Incomer and Earth Switch of the respective Transformer are open.

4. Check and ensure that all the indication lamps are healthy in primary and secondary breaker panels

5. At the upstream Switchgear, perform feeder de-earthing operation.

6. Operate the disconnector to ON position (wherever applicable) as per the vendors operating instructions.

7. Switch ON the primary circuit breaker of the concerned transformer feeder from the upstream panel as per the vendors operating instructions.

8. Check that the position indicators are correct with respect to the actual position of the disconnector


and breaker.

9. Check that the indication lamp is showing correct status of the breaker.

10. Check that the primary voltage and current are balanced.

11. Check that the voltage indications are working

12. Record the readings of the meters in the check sheet

13. Check the indications related signals to IPCS/ENMS/ICSS

14. Check the indications on the respective downstream Switchgear incomer for the presence of voltage.

15. Measure phase to phase and phase to neutral voltages to confirm secondary voltage of the transformer. Check and record the phase sequence across the secondary of the VT circuit.

16. Observe the transformer for any abnormal conditions noise, vibration, etc.

17. Put the transformer on no-load soak for 12 hours (duration to be decided at site in consultation with the vendor representative).

18. Monitor the transformer and record the winding temperature, oil temperature and voltages (primary and secondary) during the soak period.

19. After soaking period, switch OFF the transformer and check the Bucholz relay for collection of Air/Gas and vent off.

20. Correct the abnormalities identified during soaking.

21. Re-energise the transformer from upstream panel.

22. Close the secondary side circuit breaker in the downstream switchgear and ensure the following interlocks:

Ensure when downstream incomer CB is tripped, upstream primary CB trips on inter-trip and further inhibits closing of upstream CB, till fault gets reset at secondary side

Ensure downstream incomer gets tripped when upstream CB is opened or tripped

Ensure fault/close/open status in IPCS/ ENMS/ ICSS, upstream and downstream switchgears.

5.10.3 Energisation Switchgears

A. Energisation of Switchgear (Bus-A)

The transformers are now ready for loading. Initial energisation of Switchgear

will be done in bus sections with the Bus Coupler in open condition. Bus-A will

be initially energised.


1. Confirm that all the preparatory works are complete as per Section 5.10.1-C, Pre-energisation checks.

2. Ensure the availability of 110V DC/230V AC (UPS) /230V AC (wherever applicable) control supply to the control and auxiliary circuits

3. On Incomer Panel of Bus-A, ensure that the Earth Switch is open and the Circuit Breaker is in service position.

4. Ensure that the IPCS system is ready and the communications are established between ENMS & ICSS

5. Ensure that the line VT of incomer-1 is in service position.

6. Switch ON the MCB to provide 110 V AC line VT voltage signals to Relays, Meters and Indication lamps

7. On Incomer-1, check all the Phase Indicating Lamps to ensure the presence of voltage

8. Ensure that the indication lamps (on/off/auto trip/TCS Healthy) are healthy

9. Rack in the incomer-1 Circuit Breaker to service position

10. Ensure that all the conditions required for closing the Circuit Breaker are satisfied

a. Transformer is not faulty

b. Bus-A is not earthed

c. CB Mechanism is healthy

d. Cable side earth switch is open

e. Incomer under voltage relay is healthy

f. Incomer-1 is not faulty

g. Incomer-1 breaker is in service position

h. Incomer-1 Trip Circuit Supervision is healthy

i. Close permissive for Incomer-1

j. Bus Coupler CB is in open position/not in service

k. Upstream feeder CB is in service and ON

11. Ensure that the Bus-A VT is in service position.

12. Switch ON the MCB to provide 110V AC Bus VT voltage signals to relays, meters and indication


lamps

13. Ensure that all commissioning checks recommended for initial energisation by the vendor are complete

14. Ensure that the closing spring of the Circuit Breaker is charged

15. Close the Incomer-1 Circuit Breaker

16. Check the presence of bus voltage on all three phases using panel mounted voltmeter

17. Record the readings of the meters check sheet

18. Check the phase sequence of the voltage signals and record

19. Trip the Incomer Circuit Breaker via Transformer Protection. Ensure this CB trips, Inter trip of upstream and corresponding indications in all the places. Switch on the upstream and Incomer CB of the Switchgear under commissioning from remote, if applicable.

20. Check that the signals to IPCS/ENMS/ICSS system are correct

21. Check controls and indication to and from EWS

22. Observe the Switchgear for any abnormal conditions and take corrective action, if required.

23. After satisfactory initial energisation, the bus Section A of the Switchgear is ready for further checks with the Bus Coupler.

B. Energisation of Switchgear (Bus-B)


1. Confirm that all the preparatory works are completed as per Section 5.10.1-C, Pre-energisation checks.

2. Ensure the availability of 110V DC/230V AC (UPS) /230V AC (wherever applicable) control supply to the control and auxiliary circuits

3. On Incomer Panel of Bus-B, ensure that the Earth Switch is open and the Circuit Breaker is in service position.

4. Ensure that the IPCS system is ready and the communications are established between ENMS/ICSS

5. Ensure that the line VT of incomer-2 is in service position.

6. Switch ON the MCB to provide 110 V AC line VT voltage signals to relays, meters and indication lamps

7. On Incomer-2, check all the Phase Indicating


Lamps to ensure the presence of voltage

8. Ensure that the indication lamps (on/off/auto trip/TCS Healthy) are healthy

9. Rack in the Incomer-2 Circuit Breaker to service position

10. Ensure that all the conditions required for closing the Circuit Breaker are satisfied

a. Transformer is not faulty

b. Bus-B is not earthed

c. CB Mechanism is healthy

d. Cable side earth switch is open

e. Incomer under voltage relay is healthy

f. Incomer-1 is not faulty

g. Incomer-1 breaker is in service position

h. Incomer-1 Trip Circuit Supervision is healthy

i. Close permissive for Incomer-2

j. Bus Coupler CB is in open position/Not in service

k. Upstream feeder CB is in service and ON

11. Ensure that Bus-B VT is in service position.

12. Switch ON the MCB to provide 110V AC Bus VT voltage signals to relays, meters and indication lamps

13. Ensure that all commissioning checks recommended for initial energisation by the vendor are complete

14. Ensure that the closing spring of the Circuit Breaker is charged

15. Close the Incomer Circuit Breaker

16. Check the presence of bus voltage on all the three phases using panel mounted voltmeter

17. Record the readings of the meters in the check sheet

18. Check the phase sequence of voltage signals and record

19. Trip the Incomer Circuit Breaker via Transformer Protection. Ensure this CB trips, inter trip of upstream and corresponding indications in all the places. Switch on the upstream and the Incomer CB of the Switchgear under commissioning from remote, if applicable.

20. Check that signals to ENMS/ICSS system are correct

21. Check controls and indication to and from EWS

22. Observe the Switchgear for any abnormal conditions and take corrective action, if required.

23. After satisfactory initial energisation, the bus Section B of the Switchgear is ready for further checks with the Bus Coupler.

C. Energisation of Bus Couplers

Note: All the switchgears having bus sections have bus VTs. The phase

sequence of the section will be checked individually and the phase sequence

will be compared using volt meters.


1. Check the phase sequence of each section of the bus section as listed below, and record the results in the check sheet.

2. Check the phasing of busbars in the Bus Coupler panel as listed below and record the result in form

3. LV Switchgears

a. Rack out the Bus Coupler Circuit Breaker from the compartment

b. Open the top and bottom busbar shutters manually and temporarily latch it at the open position

c. Ensure that the meters used for testing have valid safety and calibration certificates

d. Use fused test leads

e. Select the appropriate voltage range for 600V AC

f. Check and ensure that there is voltage at each spout

g. Check the voltage across the similar phases of busbar at top and bottom; the voltage should be zero

h. Check the cross voltages across the top and bottom busbars; the value must be the same as the system voltage in all cases.

i. Record the results of phasing out measurements in the check sheet

j. Release the busbar shutter temporary latches and close the shutters

k. Return the coupler breaker into the compartment

l. Rack in the breaker to service position

4. HV Switchgears

a. Rack out the Bus Coupler Circuit Breaker from the compartment

b. Open the metering compartment and ensure that the respective PT terminals of each bus section (Bus-A & Bus-B) selected are correct

c. Ensure that the meters used for testing have valid safety and calibration certificates

d. Use fused test leads

e. Select the appropriate voltage range 110V AC

f. Check and ensure that there is voltage at each PT terminals


g. Check the voltage across the respective PTs of similar phases of Bus-A & Bus-B; the voltage should be zero

h. Check the cross voltages across the respective PTs of Bus-A & Bus-B; the value must be the same as the system voltage in all cases.

i. Record the results of phasing out measurements in the check sheet

j. Return the coupler breaker into the compartment

k. Rack in the breaker to service position

5. Dead Bus closing of the Bus Coupler with Incomer-2 open (Section B without power):

a. Ensure that all conditions required to close the Bus Coupler in Manual mode is satisfied.

i. Bus Coupler is in service

ii. Trip Circuit Supervision is healthy

iii. Incomer-2 Lockout relay is not operated

iv. Incomer-2 is open

b. Close the Bus Coupler Breaker

c. Check the indications and presence of voltage on bus Section B

d. Check the phase sequence on Section B at Bus VT and compare it with the phase sequence which was checked with the Incomer-2 CB closed. The phase sequence with Incomer-1 and this step shall be the same.

e. With successful Dead Bus closing checks and conditions satisfied, the Bus Coupler is ready for Live Bus closing check.

6. Dead Bus closing of the Bus Coupler with lncomer-1 open (Section A without power):

a. Ensure that all conditions required to close the Bus Coupler is satisfied.

i. Bus Coupler is in service

ii. Trip Circuit Supervision is healthy

iii. Incomer-1 Lockout relay is not operated

iv. Incomer-1 is open

b. Close the Bus Coupler Breaker

c. Check the indications and presence of voltage on bus Section A

d. Check the phase sequence on Section A at Bus VT and compare it with the phase sequence which was checked with the Incomer-1 CB closed. The phase sequence with Incomer-2 and this step shall be the same.

e. With successful Dead Bus closing checks and conditions satisfied, the Bus Coupler is ready for Live Bus closing check.


7. Live Bus closing of the Bus Coupler with Incomer-1 and Incomer-2 closed (Both the bus sections are live):

a. Ensure that all conditions required to close the Bus Coupler in Manual mode is satisfied.

i. Auto/Manual Selector Switch is in manual position

ii. Bus Coupler is in service position

iii. Trip circuit supervision is healthy

b. Close the Bus Coupler Breaker.

c. Check and ensure that there is no abnormal circulation current at the Bus Coupler ammeters.

d. Demonstrate the scheme checks in live/service condition and record the result in the form.

5.10.4 Functionality and Interlocks

A. Transformers

1. Functionality of the Transformers are checked and demonstrated during

soaking.

2. Interlocks of the Transformer breakers are tested during pre-

commissioning checks.

B. HV/LV Switchgears

Auto Transfer Scheme (ATS) Checking

Only 10kV and 400V Switchgears Bus Couplers are in normally open condition

and ATS may be checked on them. 35kV Bus coupler is kept in normally closed

condition.

After Auto Transfer changeover, returning to normal operating condition of

the breakers is completed manually.

Normal Condition


1. Both the incomer breakers of the Switchgears are in service and ON.

2. Supply voltages are within the limits

3. Auto/Manual Selector of the ATS selected to Auto

4. Vendor operation instruction and final drawings specific to the Switchgear shall be reviewed and followed to demonstrate the scheme.

5. Create Under Voltage on Incomer-1 (Bus-A) by opening the upstream Incomer Breaker for the Transformer


a. Ensure that the Bus Coupler CB closes to feed from Bus-B.

b. Check the voltage presence on Bus-A after Auto Transfer.

c. Normalise the bus sections by manual mode

d. Ensure that the Incomer Breaker closes and after that the Bus Coupler Breaker opens.

6. Create Under Voltage on Incomer-2 (Bus-B)

a. Ensure that the Bus Coupler CB closes to feed from Bus-A.

b. Check the voltage presence on Bus-B after Auto Transfer.

c. Normalise the bus sections by manual mode

d. Ensure that the Incomer Breaker closes and after that the Bus Coupler Breaker opens.

7. Check blocking of ATS for the following conditions (whichever is practical):

a. Simultaneous Under Voltage on both buses

b. Short time Under Voltage

c. Any Breaker is in test position

d. Lock out on any of the two Incomers except for Transformer fault

8. Check interface with IPCS/ENMS/ICSS for the following conditions during ATS demonstration:

a. Incomer CB tripped, ATS allowed

b. Incomer CB tripped, ATS inhibited

c. Inter trip of Upstream CB

9. Normalise the Switchgear after the tests by closing Incomer-1 & Incomer-2 CBs and by opening Bus Coupler CB

Note: For energizing switchgears of following configurations, the energization

procedure as outlined shall be followed with respective incomer with

concerned bus-coupler and applicable configurations.

5.10.5 Switchgear Configurations

Following are the different configurations of switchgear available in the facility.

A. 3 Bus sections/2 Bus couplers/2 Normal Incomers/2 Emergency Incomers from DG Sets

10kV Switchgear 04-SS01 (With Emergency Bus-E)

Fig. 5 Configuration with 3 Bus & 2B/C-SS01

1/C-A

N/C

B/C-A-E

N/O

1/C-E1

EDG 1

N/O

1/C-E2

EDG 2

N/C

B/C-E-B

1/C-B

B. 2 Bus sections/1 Bus coupler/2 Normal Incomers

35 kV Switchgear 04-SS01 (B/C-NC)

10 kV Switchgear 04-SS01 (B/C-NO)

400V Switchgear 04-SS01/02/03/04/05/06 (B/C-NO)

Fig. 6 - Configuration with 2 Bus & 1B/C

NORMAL INCOMER-A NORMAL INCOMER-B

1/C-A1/C-B

N/C

B/C

N/O

N/C

BUS-A BUS-B

C. 3 Bus sections/2 Bus couplers/2 Normal Incomers/1 Emergency Incomer from DG Set

400V Switchgear GTU-5,6,7 &8 (With Emergency Bus-C)

Fig. 7 - Configuration with 3 Bus & 2B/C-GTU

1/C-CN/C

N/O

B/C-A-B

1/C-B N/C

B/C-B-C

N/C

N/O

EDG

D. 1 Bus section/1 Normal Incomer/1 Emergency Incomer through transformer

400V Switchgear 04-SS01/02/03/04/05/06 (Emergency)

Fig. 8 Configuration with 1 Bus-LV Emergency CPF-1

NORMAL INCOMER EMERGENCY INCOMER

1/C-A 1/C-BN/C N/O

E. 1 Bus section/1 Normal Incomer

400V Switchgear - Infield pipeline

400V Switchgear - Export pipeline

400V Switchgear - Well head

5.11 35kV & 10kV Overhead Lines


1. Ensure that pre-commissioning checks are completed on the OHLs

2. Ensure that the downstream equipments are tested and ready to receive power

3. Prior to energisation, visually check the entire overhead line and the associated equipment


4. Megger the OHL and record the results

5. Give clearance to energise the OHL by switching on relevant Circuit Breaker

6. Observe for any abnormality

5.12 Motors




3. Ensure that the protection settings are as per the relay setting document.

4. Check Anti Condensation heaters and record IR values.

5. With the motor uncoupled, run the motor from both local and remote to check the sequence interlocks. Also, check the correct operation, operation of emergency stop push button, indication and annunciation of devices like lamps, alarms, etc.

6. Rotation of the motor, whether clockwise or anticlockwise, is recorde

electrical system comm procedure

Documents

electrical system description

overview electrical

general health

system voltage

power distribution

energisation of upss

auxiliary power supplies

power factor improvement