0004-2287_v05_tps msc

Copyright © - Vestas Wind Systems A/S, Hedeager 44, 8200 Aarhus N, Denmark, www.vestas.com

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CLASS 1

TECHNICAL PURCHASE SPECIFICATION

DOCUMENT:

0004-2287 V05 DESCRIPTION:

Technical Purchase Specification for Generic Mechanically Switched Capacitor (MSC) Bank Solutions

Technical Purchase Specification for Generic MSC Bank Solutions

VESTAS PROPRIETARY NOTICE: This document contains valuable confidential information of Vestas Wind Systems A/S. It is protected by copyright law as an unpublished work. Vestas reserves all patent, copyright, trade secret, and other proprietary rights to it. The information in this document may not be used, reproduced, or disclosed except if and to the extent rights are expressly granted by Vestas in writing and subject to applicable conditions. Vestas disclaims all warranties except as expressly granted by written agreement and is not responsible for unauthorized uses, for which it may pursue legal remedies against responsible parties.

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Technical Purchase Specification for Generic Mechanically Switched Capacitor (MSC) Bank

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Version History VERSION:

DATE CHANGE:

03 18.05.11 Updated communication requirements with the

PPC (section 4.1.1.11).

04 26.05.11 Updated template and contents.

05 15.03.12 New corporate address, change to Class 1.

Table of Contents

CHAPTER: DESCRIPTION: PAGE:

1. Introduction 3 1.1 Purpose 3 1.2 Copyright Notice 3 1.3 Disclaimer 3 1.4 Product Described by the Purchase Specification 4 1.5 Function of the Product 5 2. Scope of Supply 6 3. Technical Requirements 8 3.1 Product Requirements 8 3.1.1 General Requirements 8 3.1.2 Interface Requirements 14 3.1.3 Calculation of Structural and Electrical Integrity 14 3.1.4 Material Requirements 15 3.1.5 Health and Safety Requirements 15 3.1.6 Operation Environment 15 3.2 Reference Requirements 16 3.2.1 Reference to Standards 16 3.2.2 Reference to Other Vestas Documents 17 3.3 Traceability Requirements 17 4. Quality Assurance Requirements 18 4.1 Tests to be Carried Out by Supplier 18 4.1.1 Terminology 18 4.1.2 General Requirements 19 4.1.3 Notification of Tests 20 4.1.4 Factory Acceptance Test (FAT) 20 4.1.5 Site Acceptance Test (SAT) 21 4.1.6 Performance Verification Test (PVT) 22 5. Delivery Requirements 25 5.1 Transport and Delivery Requirements 25 5.2 Packing and Storage Requirements 25 5.3 Lifting and Transport Tool Requirements 26 6. Documentation Requirements 27 6.1 Documentation to be Filed by the Supplier 27 6.2 Documentation to be Forwarded to Vestas 27 6.2.1 Design Documents 27 6.2.2 Scope of Documentation 28 6.2.3 Declaration of Conformity 29 7. Definitions 30

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1. Introduction

1.1 Purpose

The document is to be used by Vestas (Vestas Wind Systems A/S and its

subsidiaries) as a basis for purchase of Mechanically Switched Capacitors (MSC) for

wind power plants based on Vestas wind turbines. Furthermore, Vestas may decide

to make the document available to third parties intending to purchase MSC for wind

power plants based on Vestas wind turbines.

The document will describe various overall design concept possibilities and

interfaces. The final concept must be decided at a case-by-case approach and will

depend on the specific project.

1.2 Copyright Notice

The document is created by Vestas Wind Systems A/S and contains copyrighted

material, trademarks, and other proprietary information. All rights reserved. You may

not alter or remove any trademark, copyright or other notice from the document.

Unless Vestas’ prior written consent is obtained the documents may only be used as

follows:

a) The document is for your internal use only and may be copied and used by

you only to the extent necessary to fulfil the Purpose. Copies of the

documents may only be distributed or disclosed to and used by your

designated advisors in accordance with the purpose stated below.

b) Vestas’ copyright notice or, where indicated, the notice of confidentiality

must appear in all electronic or hard copies of any documents as well as in

all extracts from the documents and due accreditation must be given to

Vestas in all extracts.

c) Except as expressly permitted by Vestas, you may not in any way modify or

alter the document.

Any rights not expressly granted in these terms or otherwise are reserved by Vestas.

1.3 Disclaimer

In drafting the document, Vestas has used its best practice experience and

knowledge in the field. Notwithstanding the foregoing, Vestas does not assume any

responsibilities for the content of the document nor for the results of using the

document. Specifically it shall be noted that the document should not be relied on as

a final technical specification of MSC fitting all wind power plants based on Vestas

wind turbines and that detailed MSC specifications for each individual wind power

plant application always must be carried out in connection with the final electrical

design of the wind power plant. This disclaimer applies to the document in its

entirety.

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1.4 Product Described by the Purchase Specification

This technical purchase specification (TPS) describes the MSC installation on the

medium voltage (MV – collecting system voltage level) of a wind power plant (WPP),

as shown in Figure 1.

G

G

G

G

G

G

Connecting Grid:

Typically 110 kV

Cable or overhead line

or a combination

Wind Power Plant:

Typically 50 MW

Mechanically Switched

Shunt Capacitor

Installation

Shunt Capacitor Banks:

In total about 18 Mvar

Wind Power Turbine:

Typically 2 MW

Substation:

Indoor or outdoor

WPP Radials

Collection Grid:

Typically 33 kV

Figure 1 - Single line diagrams of the WPP substation layouts.

The MSC installation is split into a number of similar MSC banks. These banks can

be equally or differently sized. In the shown diagram, a total capacity of 18 MVAr has

been decided. Each capacitor bank comprises disconnector, switching device, short

circuit current interruption device, current limiting reactor, shunt capacitor (a number

of units in an assembly), surge arrester, protection, and control.

The MV grid where the capacitor is connected is a uni-grounded system using either

impedance or earthing reactor.

Main design issues related to the operation of the MSC bank are size, layout, filter,

switching sequences and control strategies, and discharge time. Important

constraints with respect to protection and abnormal conditions are the earthing

system, surge arrestor dimensioning, network interaction and resonance

phenomena, traditional equipment protection, as well as internal and external fuse

protection.

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1.5 Function of the Product

The MSC installation on the WPP MV level is to be used to support the system with

reactive power. The MSC installation comprises a number of similarly designed

capacitor banks, which are to be controlled individually to supply an appropriate

amount of reactive power according to a predefined control criterion. This control

criterion is based on the voltage, reactive power, or power factor at a predefined

point in the power system. Capacitors are expected to be switched in and out up to

15 times per day. The installation must withstand all reasonable electrical and

mechanical conditions to which it may be exposed in its vicinity.

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2. Scope of Supply

The Supplier must deliver a complete, properly designed, and sized MSC

installation, including adequate control and protection systems, suitable for its

purpose for the specific WPP installation (according to the functioning of the MSC

installation as described in section 1.5).

Figure 2 shows a schematic drawing of the components included in the scope of

supply. Note that each WPP installation is unique, with respect to the connecting grid

conditions, concerning pure technical conditions such as short circuit capacity and

harmonic levels, and concerning administrative grid code requirements such as

reactive power supply capability, voltage controllability, and communication.

Disconnector

-Optional

Circuit

breaker

Contactor

-Optional

Current

limiting

Reactor

Surge

arrestor

-Optional

Current

transformer

Capacitor

Unit

Assembly

Mounting assembly, earth switch, etc.

Protection

MV Bus

Voltage

transformer

Control

Communication

Communication

Figure 2 – Components included in scope of supply.

A single line diagram for the two possible connections of the capacitor banks is

shown in Figure 3 and Figure 4. A contactor-based MSC installation is shown in

Figure 3.

VT

Shunt Capacitor

Installation

3-6 Shunt Capacitor Banks:

6+6+6 Mvar

3+3+3+3+3+3 Mvar

6+6+3+3 Mvar

Shunt Capacitor Bank:

CT

Vacuum Contactor

Disconnector

Current limiting device

Surge arrestor

Capacitor

Vacuum Contactor

Circuit Breaker

Disconnector

Figure 3 – A contactor-based MSC installation.

The contactor is used for the normal switching of each bank. The circuit breaker is

used for fault clearance. The circuit breaker is common for the entire installation.

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A single line diagram for a circuit breaker-based installation is shown in Figure 4.

VT

Shunt Capacitor

Installation

3-6 Shunt Capacitor Banks:

6+6+6 Mvar

3+3+3+3+3+3 Mvar

6+6+3+3 Mvar

Shunt Capacitor Bank:

CT

Circuit Breaker

Disconnector

Current limiting device

Surge arrestor

Capacitor

Circuit Breaker

Figure 4 – A circuit breaker-based MSC installation.

For this kind of installation, a circuit breaker for each MSC bank is used for normal

switching and fault clearance.

The MSC bank is connected to the busbar via a disconnector and a circuit breaker.

The disconnector function can be integrated in the circuit breaker function. The

circuit breaker must have the capability to interrupt all possible short circuit currents

without restriking. The circuit breaker must use synchronised point-on-switching in

and out. The capacitor bank bays in the substation will be of the same manufacture

as in the rest of the substation, but with additional control units for the capacitor

bank.

The current limiting device is most likely a reactor chosen in such a way that the risk

for resonances with the connecting grid is small. The surge arrestor between the

capacitor and the current limiting device should be dimensioned to protect the

capacitor by handling all possible switching overvoltages. Lightning overvoltages

should be handled by surge arrestors on the high voltage side of the substation step-

up transformer.

The bus-connected voltage transformer (VT) and current transformer (CT) in the

capacitor bay should provide the control and protection system with relevant

measurements.

The discharging resistors are to be integrated in the capacitor elements. The

discharging resistors should be chosen in such a way that the capacitor voltage

reaches harmless levels after about 5 minutes.

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3. Technical Requirements

3.1 Product Requirements

3.1.1 General Requirements

3.1.1.1 Shunt Capacitor Design

The MSC design must be in compliance with IEC 60871, Shunt capacitors for a.c. power systems having a rated voltage above 1000 V.

Capacitors must not give less than rated reactive power at rated sinusoidal voltage

and frequency, and not more than 110% of this value, measured at 25˚C uniform

case temperatures.

Figure 5 shows the three-phase layout of the capacitor in a single capacitor bank.

The shunt capacitor comprises a number of parallel- and series-connected capacitor

elements. For each phase (L1, L2, and L3, respectively), the capacitor elements are

connected in two balanced groups to two separate neutrals (N1 and N2). The two

neutrals are normally connected to each other. The connection could comprise a CT

to detect unbalances between the two balanced groups of each phase. It is also

possible to measure the voltage between the neutrals and earth to indicate

unbalance or to measure the current in the connection to earth, if the neutrals are

low-impedance earthed. The different methods to identify unbalances are also

shown in Figure 5.

L1 L2 L3

N1

N2

N1

N2

N1

N2

N1

N2

Figure 5 – Shunt capacitor design and methods for unbalance detection.

It is the Suppliers’ responsibility to choose the design.

The capacitor banks must be able to operate at 3% negative sequence voltage.

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3.1.1.2 Shunt Capacitor Earthing System

Shunt capacitor earthing must be ungrounded wye-connected banks.

3.1.1.3 Inrush Current Limiting Reactor

Each capacitor bank must be equipped with an inrush current limiting reactor.

3.1.1.4 Shunt Capacitor Discharging

The discharge resistor must be designed so the discharge time must be a maximum

of 5 minutes with a residual voltage of 50 V.

As an option, the discharge resistor must be designed so the discharge time must be

a maximum of 10 seconds with a residual voltage of 50 V. This requirement can be

requested in connection with using the capacitor banks in connection with voltage

control.

3.1.1.5 Shunt Capacitor Dielectric

The Supplier must state the use of capacitor dielectric materials – solid and/or fluent.

Flame point and precautions in case of leakage and decommissioning of materials

must be stated in the offer.

3.1.1.6 Insulators

The insulator lengths must be in accordance with IEC 60815.

3.1.1.7 Shunt Earthing

It must be possible to ground the capacitor bank via a solid earthing switch located

directly between the disconnector and the capacitor bank. The earthing switch must

be according to IEC 62271.

3.1.1.8 Connection

The capacitor bank is connected via a switching device directly to the MV busbar.

There can be a number of capacitor banks in parallel connected to the same busbar.

3.1.1.9 Switching Devices

Switching devices for the MSC can be:

Power circuit breaker, designed to interrupt fault currents

Load switch, designed to interrupt load currents

Other switchgear in the substation gives the type for the circuit breaker and loads switch. Requirements for switching devices are given in section 3.1.1.19 and 3.1.1.20.

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3.1.1.10 Instrumentation and Communication

The instrumentation comprises indications and measurements for protection, control,

and condition monitoring. Indications should be available, locally as well as at the

WPP control place, for each MSC bank disconnector position and circuit-breaker

position.

Measurements must be available for the MV busbar voltage, and the current from

each MSC bank. These measurements should normally be presented as:

The busbar phase-phase voltage in kV

The reactive power output from the MSC bank in MVAr

Indications from protection relays must be available at a remote WPP control center

via SCADA, as well as the possibility to download disturbance recordings from the

capacitor bank protection, either via Ethernet or manually in the substation.

3.1.1.11 Control System

The control principles for the WPP with MSC are mainly voltage control, reactive

power control, or power factor.

During the WWP operation, the control system for the capacitor banks (located in the Power Plant Controller [PPC]) will send the command for connecting / disconnecting the capacitor steps with a sufficient built-in hysteresis to avoid repetitive switching.

If the PPC controls the switching of the capacitors to obtain optimal control performance, the execution of the issued commands must take place without unnecessary delays. This means that when a command for connecting / disconnecting is issued from the PPC to the capacitor breaker or switch, it must be implemented in less than 250 ms, including intermediate control communication devices (e.g., the R.T.U. or other PLC) and relay delays. Note that the discharging time is not included in the 250 ms.

Additionally, in order for the PPC to use fed-forward control strategies, the feedback status of the MSC (ON/OFF) must reach the PPC with a maximum delay of 90 ms from the moment that the status of the MSC is changed to a new status.

The number of control signals needed in the PPC is shown in Figure 6.

Number of Send / Received data / PPC<-

>Capacitors

Com /protocol

Depending of number of Steps (N): 9 signals x N

Modbus TCP/IP fibre

Figure 6 - Number of control signals needed in the PCC.

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The PPC uses Modbus signals to communicate with the capacitor steps. The signals are defined as follows in Figure 7.

Figure 7 – Signal definitions.

The capacitors use synchronised point-on-wave switching.

The MSC bank relay system must have the following properties:

The ability to switch in manually (thus blocked by the discharging time) and out each capacitor bank (in manual or automatic mode)

Selectable operational mode: local or remote

Overvoltage protection

Overcurrent protection

Phase-phase unbalance protection

The switchgear will either be three single poles or a three-pole switch with a built-in mechanical delay.

The time for point-on-wave switching must be adjustable.

Note: Selection of switchgear will be dependent on the other equipment installed in the substation. Requirements will be according to this section, and sections 3.1.1.19 and 3.1.1.20.

Signal Description Signal to ‘0’ Signal to ‘1’ Signal to ‘2’ Read/Write

1 Switch position Open Close Indeterminate Read

2 Disconnector in

grounding position Close Open Indeterminate Read

3 Breaker position Open Close Indeterminate Read

4 Temporary

operation block Blocked Free - Read

5 Permanent

operation block Blocked Free - Read

6

Failure for

opening and

closing command

Failure for

opening No failure

Failure for

closing Read

7 Discharging time in

process Activated Finalised - Read

8 Automatic Manual position Automatic position - Read

9 Command to the

step switch Open Close - Write

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3.1.1.12 Shunt Capacitor Bank Protection

The mechanically switched capacitor bank must be satisfactorily protected from

abnormal conditions in the network such as overvoltages, harmonics, resonance,

etc. It must also be protected from internal faults, such as earth-faults and short-

circuits to ensure that the MSC is disconnected and any damage is limited. Normally

sufficient protection is achieved by the N-1 criterion, which states that the protection

scheme must be able to fulfill the fault clearance even if one component in the fault-

clearance chain is out of service.

Table 1 shows the events that are of interest from a protection point of view:

Event Protection

External arcing

Protected by surge arrestors on the grid side

of the WPP main transformer

Bank overcurrent

Overcurrent protection, measured on each

MSC bank current

Internal bank current imbalance

Imbalance current measured between each

of the bank neutrals

Loss of bus voltage

Loss of voltage indication, measured on the

busbar

System overvoltage

Overvoltage protection, measured on the

busbar

Loss of VT fuse

A high degree of zero sequence (or negative

sequence) voltage but no zero sequence (or

negative sequence) current. This function is

most important when impedance or

undervoltage protection is used.

Breaker failure protection

Breaker failure protection has to be applied

to all fault current interrupting devices that

lacks other kinds of backup protection for

breaker failure.

Surge arrestor protection

The surge arrestor connected between the

capacitor and the current limiting device has

to protect the shunt capacitor against

overvoltages due to network switchings.

Table 1 – Fault events and protection

Note: Selection of relays will be dependent on the other equipment installed in the substation and requirements will be according to this.

3.1.1.13 Surge Arrestor Protection

Surge arrestors will be placed on the capacitor side of the switch.

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3.1.1.14 Enclosure and Installation

The capacitor bank must be an outdoor installation.

Note: Selection of switchgear will be dependent on the other equipment installed in the substation. Requirements will be according to this section and sections 3.1.1.19 and 3.1.1.20.

3.1.1.15 Marking of Components

Each capacitor bank and unit must be marked with a visible and unique name plate

showing the information specified in IEC 60871-1.

3.1.1.16 Rated Voltage

The rated voltage area for the capacitor to operate in steady-state is within 0.9 –

1.1 pu. of rated voltage.

3.1.1.17 Shunt Capacitor Bank Maintenance

Maintenance and field measurements must be possible to schedule while the bank is

still on site. It must be possible to remove the capacitor to fulfill maintenance, change

components, and make measurements on site.

Maintenance recommendations must be supplied by Supplier.

3.1.1.18 Current and Voltage Transformer

Type and individual requirements for CT and VT will normally be decided by the

switchgear in the substation.

Class for measurement transformers:

CT must be class 1.0 (IEC 60044-1)

VT must be class 1.0 (IEC 60044-2)

3.1.1.19 Circuit Breaker

Pre- and restrike-free circuit breakers are to be used. Switching can be made as single-pole switching or three-pole switching with a mechanical delay.

If a mechanical delay is used, two poles must switch simultaneously and the last pole with a predefined delay. The circuit breaker is to be prepared for this.

If a setup with load switches after the circuit breaker is used, see Figure 3; synchronised switching of the circuit breaker is not necessary.

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3.1.1.20 Load Switch

Restrike-free load switches with a controlled energising (so called point-on-wave switching) is to be used; the switching pattern is as for circuit breakers.

Disconnection in case of faults will be made by a circuit breaker in front of the load switch. See Figure 3.

3.1.2 Interface Requirements

Electrical main data for the system in which the capacitor bank is to be placed will be

a combination of the data shown below:

Nominal frequency 50 or 60 Hz

Nominal voltage level 10, 20, or 30 kV

Highest operating voltage 12, 24, or 36 kV

Nominal voltage level 1 min. 50-60 Hz voltage 1.2/50µs impulse voltage

10 kV 28 kV 86 kV

20 kV 50 kV 125 kV

30 kV 70 kV 170 kV

Table 2 - Electrical main data for the connecting system

Short circuit level and X/R-ratio: ISCmax at MV busbar: 30 kA (Um=36 kV)

X/R-ratio: 1.7-10.0

3.1.3 Calculation of Structural and Electrical Integrity

When a candidate shunt capacitor installation design is made according to the

requirements in this TPS, its properties with respect to switching transients have to

be verified. An electromagnetic transient programme like PSCAD/EMTDC is

recommended for the verification. The transient overvoltages at the most critical

points of the WPP have to be observed for the most critical switchings, with respect

to energisation and back-to-back switching, for the most unfavorable operational

conditions. If the candidate design does not pass the verification test, it must be

redesigned and tested again until it passes. See Figure 8.

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Start

Continue

Switching overvoltage

study to find potential

overvoltages at the WPP

Maximum

overvoltages

= Vmax

Vmax<VdMaximum acceptable overvoltages =

Vd

YES

Return to the current

limiting reactor design

and continue the process

NO

Stop

The design is OK

Current limiting

reactor design for

each bank

Figure 8 - Switching overvoltage study to verify that the switching overvoltages are within acceptable

limits.

The verification study must be reported and forwarded to Vestas for approval of the

final design.

3.1.4 Material Requirements

Materials used in the manufacturing of the complete capacitor bank unit must be of

high quality, suitable for their purpose, and capable of meeting the performance

(including temperature range) and reliability requirements of this document.

3.1.5 Health and Safety Requirements

The delivery of the complete capacitor bank unit must fulfill all necessary

international and national requirements related to health and safety requirements for

design, installation, maintenance, and operation. All components and services to

fulfill this are included in the scope of work.

3.1.6 Operation Environment

3.1.6.1 Operating Ambient Temperature

The ambient temperature for continuous operation of the capacitor units must be

allowed to range between -40 and +50C°, without de-rating of the exchanged

reactive power. The -40 and +50C° must be seen as the minimum performance

required; higher positive or lower negative temperatures are regarded as premium.

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3.1.6.2 Humidity

The capacitor unit must be able to operate under an atmospheric humidity ranging

between 0% and 100% condensing, including rain and snow.

3.1.6.3 Altitude

The capacitor unit must be able to operate up to 1500 metres above sea level

without de-rating of the continuous reactive power.

The altitude at which the capacitor unit will start reducing its reactive power capability must be clearly specified by the Supplier, together with the de-rating profile as a function of altitude.

3.2 Reference Requirements

3.2.1 Reference to Standards

Because the capacitor unit will be installed worldwide, the Supplier is responsible for

compliance with the standard and guidelines for the region in question. In the

following table, the different standards and guidelines for the different regions are

listed. For regions not mentioned in the list, the capacitor unit must comply with IEC

standards.

Standard Description

IEC 60871 Shunt capacitors for a.c. power systems having a rated voltage

above 1000 V.

IEC 61642 Industrial a.c. networks affected by harmonics – application of filters

and shunt capacitors.

IEC 62271 High-voltage switchgear and controlgear – Part 110: Inductive load

switching.

IEC 60815 Guide for the selection of insulators in respect of polluted conditions.

IEC 60044-1 Instrument transformer – CT.

IEC 60044-2 Instrument transformer – induction VT.

IEEE Std

1036-1992.

IEEE Guide for Application of Shunt Power Capacitor.

IEEE Std

18-2002

IEEE Standard for Shunt Power Capacitors.

Table 3 – Standards and guidelines.

The following description is referring to the relevant IEC standard. According to

Table 3, these standards must be substituted with the applicable standards

depending on site location; e.g., ANSI/IEEE for North America or AS for Australia.

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3.2.2 Reference to Other Vestas Documents

Table 4 defines other Vestas documents that are mandatory to comply with in

connection with delivery according to this TPS.

ID Subject Requirement References and

comments

4.3.4.1 Vestas Chemical and

Material Blacklist

Available from

www.vestas.com

Table 4 – Other Vestas documents.

3.3 Traceability Requirements

The Supplier must maintain a list for all components included in the complete

capacitor bank unit showing manufacturing data and date.

When asked, this list must be sent to Vestas. The list must cover a period for a

minimum of 10 years. The manufacturing date must be traceable with the serial

number.

http://www.vestas.com/

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4. Quality Assurance Requirements

All design and process changes that influence the function, performance, safety,

reliability, robustness, or lifetime of a component or parts hereof must be approved

by Vestas Wind Systems A/S prior to starting redesign.

Design changes must be verified using appropriate calculation and testing methods,

and based on all relevant technical experiences.

All design changes that affect type approvals must be approved by the relevant Type

Approval Bodies prior to starting redesign.

The product must comply with all relevant EU- and international directives. Vestas

wants to cooperate only with Suppliers who continuously prove their ability to meet

Vestas’ requirements. The condition for meeting requirements:

A documented and approved quality system according to ISO 9000/QS 9000/TS 16949 or similar standard together with a successful Supplier approval

A quality activity plan accepted by Vestas for the unit in question

An inspection agreement with Vestas

Continuous deliveries, meeting Vestas’ requirements

A successful part approval (Vestas’ sample test or PPAP)

Quality assurance and inspection must be done by the Supplier, with the result that

non-acceptable units are discarded before delivery to Vestas.

Such collaboration implies an inspection agreement between managers of quality

assurance at Supplier and Vestas.

4.1 Tests to be Carried Out by Supplier

4.1.1 Terminology

FAT: Factory Acceptance Test, which contains type tests and

routine tests to improve quality and performance.

SAT: Site Acceptance Test, which includes commissioning. The

SAT is a routine test to be performed at every

commissioning to improve quality and performance.

PVT: Performance Verification Test, which demonstrates that the

required range of operation can be met, and demonstrates

compliance with grid codes. It can be included in the FAT

and/or SAT.

Type test: This test is not project-specific. It includes design

verification. Normally, the type test is a large part of the FAT.

Routine test: This test is specific to the project and needs to be performed

at each deliverable. It is a part of the FAT.

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4.1.2 General Requirements

1. Testing must be performed in accordance with the applicable standards in Section 3.2.1 and any additional requirements in this TPS. If the requirements of this specification conflict with any of the above standards or practices, this specification must apply. Where standards are not suitable or applicable, other common industry procedures and mutually acceptable methods must be used.

2. The Supplier may refer to type tests performed in the past. The Supplier must enclose with the bid a list of tests clearly stating the type and routine tests that will be performed for this project. The Supplier must also state the tests where a report from a previously performed test must be considered in lieu of performing new tests.

3. The results obtained from tests must demonstrate that the equipment

conforms to the requirements of this specification.

4. The results obtained from tests must be compiled and organised in writing. All test results must contain the appropriate signature of the Supplier.

5. Vestas reserves the right for itself and/or its representatives to be present and witness all tests. Vestas may require that tests be repeated in the presence of its representatives if the Supplier neglects to provide notification as presented below. If Vestas or its representatives do not attend a test to which proper notification has been given, Vestas has waived the right to witness the test.

6. The Supplier must furnish all labour, materials, instrumentation, recording, and testing facilities for all tests in this specification.

7. If any piece of equipment provided as a part of the capacitor unit system does not pass a test or is damaged, the Supplier must replace or repair the failed or damaged equipment and, if necessary, modify the equipment design. The Supplier must repeat the tests previously done on any equipment that is replaced, repaired, or modified. All expenses for the material, re-installation, and re-testing will be the responsibility of the Supplier.

8. At all times, the Supplier must obtain permission from Vestas to perform field verification tests when the capacitor unit is connected to the power system. These tests may have to be performed during night or low load periods. If transmission system conditions prevent the Supplier from performing field tests, this fact must not delay other contractual activities and obligations, neither of Vestas nor of the Supplier.

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4.1.3 Notification of Tests

The Supplier must give Vestas notice of type and routine tests three weeks before

the actual testing date.

Inspection and test plans must be submitted to Vestas 30 days prior to

commencement of the test.

The Supplier must furnish a detailed Inspection and Test Plan for the commissioning

and field verification 2 months before the beginning of the testing.

4.1.4 Factory Acceptance Test (FAT)

The Supplier must perform a full-scale FAT. Prior to delivery, the capacitor unit

should be tested at the factory with possible participation of Vestas and the end

user.

Notification of the FAT must be sent to Vestas a minimum of 3 weeks prior to the

start of the test.

The FAT must include, but is not limited to, the following:

Check mechanical state and earthing connection of all cubicles

Check satisfactory equipment labelling

Check that all wiring within cubicles matches drawings, and all cores are clearly identified

Perform insulation resistance tests on all secondary wiring

Perform magnetisation tests on all CTs, and check polarity

Perform primary injection tests on CT to relay terminals, to check ratios, and correct connections

Perform secondary injection tests

Perform functional tests

Perform a test with random change of setpoints in all control modes

Perform a test with random change in feedback process values in all control modes

Check calibrations of all measurement transducers and meters

Demonstrate communication between capacitor unit and SCADA

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4.1.5 Site Acceptance Test (SAT)

4.1.5.1 Cold Tests

The cold tests are performed on site with a fully assembled capacitor unit, without

connecting the capacitor unit to the power system. The SAT must include, but is not

limited to, the following:

Check insulation of auxiliary cables Verify operation of capacitor unit auxiliary power distribution Test relay protections and protective control functions (by secondary injection) Test control and monitoring system Check operation and indications of circuit breakers, disconnect, and earthing switches

Check capacitance and tan δ of capacitor banks

Check CTs and VTs

Check overall trip operations from protections to breaker

Check circuits through interface.

4.1.5.2 Heat Tests

Upon satisfactory completion of the cold tests, energising of the capacitor unit

system and a function test must be performed. These tests are performed on site

with the fully assembled capacitor system with the equipment connected to the

power system and in operation. The tests must include, but are not limited to, the

following items:

Measure and verify the capacitor system operation at nominal power system properties

Verify start, stop, and trip sequences

Verify current and voltage waveforms during in-rush and during high voltage / medium voltage (HV/MV) breaker trips

Verify change of reference point and slope setting

Verify manual control mode function

Verify the dynamic response of the voltage / reactive power (V/Q) regulator, and the gain supervision/optimisation functions

Measure harmonic voltage on the Point of Common Coupling (PCC) of the WPP

Measure audible noise

Measure temperature rise at maximum available load

Check supplementary control functions

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4.1.6 Performance Verification Test (PVT)

The PVT must demonstrate that the specified functional properties can be met in the

entire operating range, under all conditions. It is the responsibility of the Supplier to

perform and document the PVT. To the extent possible, the PVT must be conducted

in the factory, on the complete and assembled capacitor unit, subject to conditions

as close to the project-specific conditions as possible. All performance verification

tests should be conducted at worst-case combinations of minimum and maximum:

ambient temperatures

continuous frequencies

line voltages

short-circuit ratios

X/R ratios

These tests include, but are not limited to, the following (described in subsections

4.1.6.1 through 4.1.6.3):

Steady-State Properties – Limits of Operation

Robustness

Dynamic Properties of the Capacitor Controller

4.1.6.1 Steady-State Properties – Limits of Operation

In reactive power control, in power factor control, and in voltage control, the following

must be demonstrated:

Operation at maximum capacitive current. Results of interest are harmonic levels and temperature rise.

Operation as 1, with one module out of service (N-1 operation).

Operation as 1, with 3% negative sequence line voltage.

4.1.6.2 Robustness

To test robustness of the capacitor unit, the following must be demonstrated:

Loss of sensor signal. Record response to removal of a CT or VT.

Loss of auxiliary supply: Record response to removal of power supply.

Response to failure in 1 of N units.

Trip of capacitor unit MV breaker in all three control modes.

Trip of WPP HV breaker in all three control modes.

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4.1.6.3 Dynamic Properties of the Capacitor Controller

The next requirements shall be considered only if the WPP control is implemented

outside the PPC supplied by Vestas.

Reactive power control

Large-signal properties. Response to change in reactive power setpoint from maximum inductive to maximum capacitive current, and reverse.

Small-signal properties. Response to 5% change in reactive power setpoint.

Disturbance rejection. Response to change in turbine reactive power load (possibly to be conducted on site).

Disturbance rejection. Response to change in turbine active power load (possibly to be conducted on site).

Disturbance rejection. Response to step in main transformer on-load tap-changer position (possibly to be conducted on site).

Transition between linear and limited operation. Response to steps in reactive power setpoint.

Power factor control

Large-signal properties. Response to change in power factor setpoint from maximum underexcited to maximum overexcited, and reverse.

Small-signal properties. Response to 0.01 pu change in power factor setpoint.

Disturbance rejection. Response to change in turbine reactive power load (possibly to be conducted on site).

Disturbance rejection. Response to change in turbine active power load (possibly to be conducted on site).


Transition between linear and limited operation. Response to steps in power factor setpoint.

Voltage control

Large-signal properties. Response to change in voltage setpoint from minimum to maximum, and reverse.

Small-signal properties. Response to 0.01 pu change in voltage setpoint.

Disturbance rejection. Response to symmetrical 3-phase fault causing a drop in line voltage positive-sequence level of 5%, and subsequent fault clearance.

Disturbance rejection. Response to 2-phase fault causing a drop in line voltage positive-sequence level of 5%, and subsequent fault clearance.

Disturbance rejection. Response to 1-phase fault causing a drop in line voltage positive-sequence level of 5%, and subsequent fault clearance.


Transition between linear and limited operation. Response to steps in reactive power setpoint.

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Fault ride-through

Response to 3-phase, 2-phase, and 1-phase faults causing a drop in line voltage positive-sequence level to between 0% and 90% remaining voltage, and subsequent fault clearance.

Response to 3-phase overvoltage beyond 110%.

The durations of the faults and the requirements to capacitor unit reactive output during faults will be specified in the project-specific data sheet.

Response to repetitive fault sequences. To be specified in the project-specific data sheet.

In addition to the above, special tests demonstrating grid code compliance may be

required and/or imposed by the grid owner. This will be stated in the project-specific

data sheet.

4.1.6.4 Comments

The Supplier must perform tests at factory and participate on site test. Routine tests

and type test must be performed at factory before the FAT.

For the first capacitor unit, both routine tests and type tests must be performed and

for the remaining capacitor units, only routine tests must be performed.

The test programme and procedures must be developed by the Supplier to ensure

that the commissioning of the equipment and the interconnection to the power

system:

do not adversely affect the security of the transmission/distribution network or the quality of supply.

minimise any possible threat of damage to other plant, equipment, and Vestas installations connected to the transmission/distribution network.

Test programme and procedures must be sent to Vestas a minimum of 3 months

prior to the start of test for approval. All tests must be listed in the bid.

Documentation of the tests must be submitted to Vestas for approval no later then 2

weeks after testing.

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5. Delivery Requirements

5.1 Transport and Delivery Requirements

The complete capacitor bank unit must be capable of full performance after being

exposed to ground handling and transportation by truck, train, ship, or airplane.

If the delivery of the product does not meet the specified demands, and the product

is damaged during transport, Vestas will bring out a deviation report to be fulfilled

according to the instructions.

If components are missing, the Supplier is obligated to deliver the components to

Vestas as soon as possible.

For transport where Vestas buys Ex Works (EXW), Free on Board (FOB), or Free

Carrier (FCA), the entire responsibility is located at Vestas.

A delivery is considered received when the last unit for the whole delivery, including

required documentation, is received at Vestas.

A delivery is accepted when Vestas has received documentation that the Supplier’s

outgoing inspection has approved the delivery.

However, Vestas has the full right to reject units and demand replacement if

defective units later are found (which can be traced back to lack of fulfilment of the

requirements defined in this document).

The transportation and storage temperature must fit the operating ambient

temperature specified in Section 3.1.6, for a total period of time of no longer than

3 months.

Equipment must be mounted with a G-meter during transport to register unwanted

vertical and horizontal movements during transport.

5.2 Packing and Storage Requirements

The Supplier has the responsibility of properly securing the product during transport

to the means of transportation.

The complete capacitor bank unit must be packed and supported in a way so that

the possibility of damaging any component is absolutely minimal. This includes, in

particular, damage to surface treatments.

Item no. and P no. must be indicated on the package, including on the packing list.

Furthermore, the complete capacitor bank unit must be packed so that the

permanently and temporary markings are visible when the box is opened.

Loose components must be packed in a way to prevent the possibility of scratching

or damaging other components in the delivery.

The complete capacitor bank unit must also be packed in a way so that the risk of oil

spill is absolutely minimal.

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The packing of the complete capacitor bank unit must ensure protection of untreated

surfaces from corrosion.

The complete capacitor bank unit must be capable of meeting the requirements of

this specification after long-term storage, which is defined as a minimum of 8 months

of normal shelf storage (air humidity [RF] < 50%) under the original packaging

conditions.

5.3 Lifting and Transport Tool Requirements

All necessary lifting and transport provisions are included in the scope of delivery.

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6. Documentation Requirements

6.1 Documentation to be Filed by the Supplier

The Supplier is requested to file all necessary documentation to comply with

declaration of conformity according to Section 6.2.3.

6.2 Documentation to be Forwarded to Vestas

6.2.1 Design Documents

All documentation must be in the English language.

Design must be based on the International System of Units (SI) and engineering

codes and standards as listed in Section 3.2.1.

All equipment, components, and permanent structures must be designed and

manufactured according to applicable local and international codes.

Designs, drawings, specifications, and supporting documents must be of a quality

and completeness consistent with electrical industry standards.

Coding and marking of equipment and documentation is subject to agreement with

Vestas.

Item number and name must identify each piece of equipment indicated on

diagrams.

The requested documentation is a part of the complete delivery.

Any deviations or changes from data in this TPS – or from data previously presented

and accepted – must be specifically mentioned by the Supplier. Information and data

not specifically mentioned and accepted/signed by Vestas must not be considered.

Vestas must be allowed 10 working days for review and commenting on documents

submitted for approval and acceptance.

Prior to Taking Over Certificate (TOC), the Supplier must submit five printed copies

and one CD with electronic copies of all specifications and drawings to Vestas as

listed below, revised to be ‘As Built’.

Maintenance and troubleshooting must include step-by-step instructions on specific

activities, unique to the equipment, as a part of the maintenance plan and/or

troubleshooting manual.

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6.2.2 Scope of Documentation

All data and documentation must be collected in electronic form on a CD. The CD

must contain, but is not limited to, the following documentation as .pdfs and drawings

as .dxfs. The documentation listed below must be arranged in the following four

groups on the CD:

Manuals

Drawings

Specifications

Test reports and certificate

Manuals

Operation manual

Installation manual

Service and Installation manual

Drawings

Panel outline drawings

Single line diagrams

Power circuit diagrams

Control circuit diagrams

Terminal connection diagrams

Cable list

Specifications

Component description (Main specifications)

Characteristic data (Detail specifications)

Component data sheets

Parts list

Spare part list

Supplier’s brochures

Test Reports and Certificates

Test specifications

Type test reports and certificates according to section 4.1

Type test certificate for conformity with IEC 60439-1

Test certificates for alarm and protection equipment

Routine test reports and certificates

SAT reports and certificates

PVT reports and certificates

Declaration of conformity

Documentation on manufacturing quality levels

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6.2.3 Declaration of Conformity

The supplier shall provide Vestas with an EC Declaration of Conformity for the

product with reference to valid directive(s) and include all supporting test reports to

demonstrate compliance to the applicable directives.

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7. Definitions

Back-to-back switching Switching a capacitor bank with and in close electric proximity to one or more other capacitor banks.

BIL Basic Impulse Level, which is the level of lightning strike the equipment can withstand.

Capacitor The word ‘capacitor’ is used when it is not necessary to specify the meaning between installation, bank, unit, or element.

Capacitor bank An assembly at one location of capacitors and all necessary accessories, such as switching equipment, protective equipment, controls, etc., required for a complete operating installation. It may be a collection of components assembled at the operating site or may include one or more piece(s) of factory-assembled equipment.

Capacitor element A device consisting essentially of two electrodes separated by a dielectric.

Capacitor installation One or more capacitor banks and their accessories.

Capacitor unit An assembly of dielectric and electrodes in a container (case), with terminals brought out, that is intended to introduce capacitance into an electric power circuit.

CT Current Transformer

EMC Electromagnetic compatibility

MSC Mechanically Switched Capacitor

MV Medium Voltage

PCC Point of Common Coupling

PF Power factor

PPC Power Plant Controller

TPS Technical Purchase Specification

VT Voltage Transformer

WPP Wind Power Plant

WTG Wind Turbine

0004-2287_v05_tps msc

Documents

technical requirements

documentation requirements

reference requirements

product requirements

vestas vestas wind systems

general requirements

delivery requirements

material requirements