over all electrical setup in sfgcs

PAKISTAN PETROLEUM LIMITED

SUI FIELD GAS COMPRESSOR STATION TRAINING PROGRAM FOR Mr. Dur Muhammad

ELECTRICAL DEPARTMENT .

S.NO TOPICPAGE NO.

1. POWER GENERATION AT SFGCS .

2. OVERALL SETUP OF ELECTRICAL INSTALLATION AND ONE LINE DIAGRAM

3. HT AND LT DISTRIBUTION OF THE PLANT

4. INTRODUCTION TO SUL VARIABLE FREQUENCY DRIVE SYSTEM.

5. UPS SYSTEM

6. SWITCHGEAR TRIPPING SUPPLY

7. LOAD SHEDDING SYSTEM OF THE PLANT

8. Earthing system .

9. MAINTENANCE OF ELECTRICAL MAIN AND AUXILIARY EQUIPMENTS.

10. HAZARDOUS AREA EQUIPMENT

Prepared by: JAN ALI

A. E (ELECTRICAL).

Training report page No. 1


1.0 POWER GENERATION AT SFGCS

Four gas turbine driven generators are installed in SFGCS.Power is generated at 3 phase 6600 Volts, 50Hz, and distributed to step down transformer through HT circuit breakers. The distribution transformer step down 6.6KV into 3-phase 400Vots, neutral solidly ground. The transformer secondary supply is connected to motor control center MCC panels through LT, air circuit breaker (ACB). Mostly power is consumed at 3- phase 400Volts 50 Hz supply. One emergency generator is installed for emergency power supply. Power generation and distribution system of SFGCS is shown in one line diagram. Following is the data of SFGCS generation and distribution system equipments.

1.1. TURBO GENERATOR

Turbo Generator G 501-A/B/C/D

Capacity 4X4010 KVA 4X 3.2 MW

Current 351 Ampere

Voltage 6600 Voltage,

Frequency 50 Hz

Power factor 0.85

1.2 EXCITATION SYSTEM

Type: Brush less excitation

1.3 EXCITER STATOR

The exciter stator is installation onto the main generator end-shield.

1.4 EXCITER ROTOR



Exciter rotor directly coupled to the main generator rotor shaft. The rotor of the exciter is a magnetic core made from stacked silicon laminations and mounted on a sleeve forThe easy assembly onto the main generator shaft.

1.5 ROTATING (DIODES) RECTIFIER ASSEMBLY

Since out put of the exciter is three phase AC. It is rectified to provide the DC power for generator field excitation.

1.6 PERMANENT MAGNETIC EXCITER (PME)

PME is directly coupled to the main generator rotor shaft. It supplies 120VAC, 50 Hz to the Automatic Voltage Regulator.

1.7 AUTOMATIC VOLTAGE REGULATOR ( AVR)

The Automatic voltage regulator installed in unit control panel of each generator. It works on 120VAC supply of PME. It senses the 3-phase line-to-line main generator voltage through AVR PT voltage 6.6KV/100Volts and gives the output DC Voltage/ current to the exciter stator in order to maintain the main generator line voltage at regulated 6.6 KV.

1.8 EMERGENCY GENERATOR

Emergency generator supplies power to Turbo. Generator auxiliaries, UPS one instrument air compressor one chiller or Essential load when complete power supply failure occurs. EG start automatically in case of black shut down EG can be start manually and put on load

Emergency Generator set = 740 KVA or 650 KW 400 V, 3 phase, 50 HZ.



2.0. OVERALL SETUP OF ELECTRICAL INSTALLATION AND ONE LINE DIAGRAM .

Refer to one line diagram the over all setup of electrical installation are as under in SFGCS.

2.1 TURBO GENERATOR

Four gas turbine driven generators G-501A/B/C and D are installed to meet the electrical load requirement of SFGCS. Normally three generators are running and one is standby or under maintenance.

Capacity = 4x 4010 KVA4x 3.2 MW

Voltage and frequency 6.6 KV, 50 HZ

2.2 HT PANEL SUB-STATION NO.1

Main Generator Switch Board (MGS) or HT panel consists of HT bus bar A & B. The vacuum type HT circuit breakers are installed in HT panel. Following is the brief installation sequence of HT circuit breakers.Bus bar ‘A’ and ‘B’ Bus-Section HT breaker is normally closed.

HT BUS ‘A’

Turbo generator A, B and Transformer T-1, T-3, T-5, T-7, T-9, T-12/T12A, T-13/T13A (standby),

HT BUS ‘B’

Turbo generator C, D and Transformer T-2, T-4, T-6, T-8, T-10, T-11, T-14/T-14A, T-13

2.3 PLANT SERVICES BOARD. SUB-STATION NO.1.

Transformer T-7 and T-8 are connected to plant services board MCC panels in following distribution order.LT ACB of T-7 is connected to Bus ‘A’, normally 'Closed'.LT ACB of T-8 is connected to Bus ‘B’, normally Closed.LT ACB of Bus-section ‘A’ and ‘B’ Normally ‘Opened’.



And ‘B’ LT circuit breaker ACB of plant services board is normally opened.

2.4 EMERGENCY BOARD.

Transformer T-9, T-10 and emergency generator are connected to emergency board MCC panels. In following distribution order.LT ACB of T-9 is connected to Bus ‘A’, normally Closed.LT ACB of T-10 is connected to Bus ‘B’, Normally Closed.LT ACB of Emergency Generator is connected to Bus ‘B’ Normally ‘Opened’.

2.5 TURBO COMPRESSOR AUXILIARIES TCA-1 SUB-STATION NO.3 Transformer T-1 and T-2 are connected to MCC panels of C101A and C101-B in following distribution order.

LT ACB of T-1 is connected to Bus ‘A’, Normally ‘Closed’.LT ACB of T-2 is connected to Bus ‘B’, Normally ‘Closed’.LT ACB of Bus section ‘A’ and ‘B’, Normally ‘Opened’

2.6 TURBO COMPRESSOR AUXILIARIES TCA-2 SUB-STATION NO.4 Transformer T-4 and T-5 is connected to MCC panels of C101-C and C101-D in following distribution order.

LT ACB of T-3 is connected to Bus ‘A’, Normally ‘Closed’.LT ACB of T-4 is connected to Bus ‘B’, Normally ‘Closed’.LT ACB of Bus section ‘A’ and ‘B’, Normally ‘Opened’

2.7 TURBO COMPRESSOR AUXILIARIES TCA-3 SUB-STATION NO.5 Transformer T-5 and T-6 are connected to MCC panels of C101-E and C101-F in following distribution order.

LT ACB of T-5 is connected to Bus ‘A’, Normally ‘Closed’.LT ACB of T-6 is connected to Bus ‘B’ , Normally ‘Closed’.LT ACB of Bus section ‘A’ and ‘B’ , Normally ‘Opened’

2.8 TURBO COMPRESSOR AUXILIARIES TCA-4 SUB-STATION NO.6 Transformer T-11 is connected to MCC panels of C101-G in following distribution order.



LT ACB of T-11 is connected to Bus ‘B’, normally ‘Closed’.LT ACB of feeder to Bus ‘A’ of TCA-4 which is coming from T-5 MCC panel is connected to Bus ‘A’, Normally ‘Closed’.LT ACB of Bus section ‘A’ and ‘B’, normally ‘Opened’.

2.9 SUL MOTOR COMPRESSOR VFD AND MCC PANEL SUB-STATION NO.7 (C201A) Converter Transformer T-12 is connected to VFD and Auxiliary transformer T-12A is connected to MCC panels of C201-A. Provision to feed MCC panel of sub-station No.7 from Substation No.8 or vice versa is also incorporated.

2.10 SUL MOTOR COMPRESSOR VFD AND MCC PANEL SUB-STATION NO.8 (C201B ) Converter Transformer T-13 is connected to VFD panel and Auxiliary transformer T-13A is connected to MCC panels of C201-B. Provision to feed MCC panel of sub-station No.8 from Substation No.7 and Substation No. 9 or vice versa is also incorporated

2.11 SUL MOTOR COMPRESSOR VFD AND MCC PANEL SUB-STATION NO.9 (C201C) Converter Transformer T-14 is connected to VFD panel and Auxiliary transformer T-13A is connected to MCC panel of C201-C. Provision to feed MCC panel of sub-station No.9 from Substation No.8 or vice versa is also incorporated.

2.12 110 VAC INSTRUMENT SUPPLY UPS (UNINTERRUPTED POWER SUPPLY).

2x160 KVA UPS inverter and 110V Ac instrument supply distribution board are installed in UPS room. UPS battery bank No.1 and 2 and their fused switch panel are installed in Battery room. Each battery bank contains 2x297 Nickel cadmium cell and capacity of each cell is 250 Ah.Mains supply feeder of Inverter No.1 is connected to Emergency switch board bus bar ‘A’ Mains supply feeder of Inverter No.2 is connected to Emergency switch board bus bar ‘B’ Mains supply Feeder manual link is connected to Emergency switch board bus bar ‘B’ UPS battery bank 1 is connected to inverter No.1 and Bank 2 is connected to inverter No.2.

2.13 110VDC SWITCHGEAR TRIPPING SUPPLY .



110V DC switch gear tripping supply is consists of Charger No.1, 2, their battery bank No.1, 2 and 110 VDC switch gear tripping supply distribution board is installed in Substation No.1. The AC supply of Charger No1 is fed form emergency switchboard bus bar ‘A’ and The AC supply of Charger No.2 is fed form emergency switchboard bus bar ‘B’. Each Battery bank consists of 88Cells nickel cadmium battery and capacity of each cell is 29 Ah

2.14 24 V DC FIRE AND GAS SUPPLY .

Battery chargers No.1 and 2 and distribution board of 24VDC fire and gas are installed in UPS room. Battery bank No.1 and 2 of 24VDC supply of fire and gas are installed in battery room. Each Battery bank consists of 20 Cells nickel cadmium battery and capacity of each cell is 520 Ah.

2.15 48 V DC TELEPHONE SUPPLY

Battery charger module is installed in UPS room and battery bank is installed in battery room. Battery bank consists of four cells of lead acid sealed type maintenance free batteries.



3. HT AND LT DISTRIBUTION SYSTEM OF THE PLANT

Reference should be made to one line diagram attached herewith this report for understanding HT and LT distribution system in SFGCS. Power is generated at 6600Volts and connected to main generator switch board (MGS) through HT circuit breakers of turbo generators.

HT panel consists of two bus bar A and B. Normally the bus section HT circuit breaker is closed. HT Voltage distributed from HT panel through HT circuit breakers of transformer feeders. Each transformer has its own HT circuit breaker. Transformer step down 6.6KV/400V, 3-phase, and neutral solidly grounded. Secondary voltage, which is 400V phase to phase, is connected to LT bus bar of MCC panel through LT air circuit breaker.

HT Distribution panel switchboard voltage 6600V

HT circuit breakers Vacuum type: rating 630 Amp.

Transformer T-1 to T-6 and T-9, T-10 = 1.25MVA, 6.6KV/400V

Transformer T-11 = 750 KVA, 6.6KV/400V

Transformer T-7 and T8 = 1.6 MVA, 6.6KV/400V

Converter transformer T-12, T-13 and T-14 =3010 MVA, 6.6KV/2X1175/900V

SUL Aux transformer T-12A, T-13A and T-14A = 750KVA, 6.6KV/400V



4. INTRODUCTION TO SUL VARIABLE FREQUENCY DRIVE SYSTEM

Three motor driven compressors are installed in SFGCS to maintain SUL gas pressure and flow. Induction type motors capacity 2.2 MW each, having soft start Variable Frequency Drive System are installed. Induction type motors are robust and require minimum maintenance. Frequency of the motor is varied in VFD system so that a desired motor speed is obtained.

Normally two SUL compressor (VFD) are in operation and one is stand by or under maintenance. Sufficient power generation capacity is available in SFGCS to feed these VFD motors..

4.1 SUL VFD PANEL MCC PANEL :

Variable frequency drive motor VFD panel and its 400V MCC panels for motor compressor auxiliaries of C201-A, C20-B, C201-C. are installed in sub-station No. 7,8 and 9 respectively. A castle key inter locking system is available for safe isolation and energization of VFD system.

4.2 VFD SYSTEM.

CONVERTER TRANSFORMER CAPACITY 3010 MVA ,

Primary 6.6KVSecondary Delta /Delta/star 2x1175Tertiary winding : 900V

6 Phase bridge rectifier ( thyristers ). Rectify 2 X 1175 VAC, 50Hz AC supply into DC supply.

DC link reactor to smooth DC voltage.

4.3 DIVERTER .



A capacitor and inductor circuit, activated during startup of motor when low frequency, low RPM.

4.4 INVERTER BRIDGE PANEL .

Thyrister bridge for inverting DC supply into AC supply

4.5 MOTOR OUT PUT PANEL .

Connected to main motor via motor capacitors and inductor circuit.

4.6 DIGITAL FREQUENCY MODULE DFC MODULE .

DFC module performs following tasks.

Total control and monitoring of VFD system. Generate and control the firing pulses of thyristers of bridge rectifier, inverter, diverter. Control of Start up and shut down.Initiate Protection alarm and trip signals. Communicate unit control panel in control room. Inter face with programmable logic control (PLC) of chilled water and air-conditioning system of the VFD.DFC module interfacing (auxiliary cards) are BIB (Bridge Interfacing Boards ),VFB cards (voltage Feed Back) CT transition board for current feed back. Harmonic filter alarm & trip PCB (printed Circuit Board ).

4.7 HARMONIC FILTER PANEL .

The purpose of harmonic filter is to reduce harmonics voltage and current distortions which produces during the rectification and inversion process of VFD system. Harmonic filter consists of capacitor, inductor and resistor circuit. Harmonic capacitors and inductors circuit is installed in VFD panel and resistors are installed in transformer yard.

4.8 CHILLED WATER AND AIR-CONDITIONING SYSTEM .

VFD thyristers have chilled water cooling system 02 Nos chilled water cooling units are installed for each VFD sub-station. One chilled water unit is in operation and another one is standby. Each chilled water unit consists of 02 Nos refrigerant compressor, 01 chilled water pump. Chilled water is circulated via hoses and ABS plastic pipes to the thyrister heat sinks.

A de-ionizer bottle having primary and secondary filters is installed in chilled water circuit for de-ionization of water and kept it less than 1.5µs. An overhead tank is normally filled with chilled water up to the maximum level to maintain water flow. A chilled water system is monitored by conductivity meter, pressure switch, pressure gauge, temperature switch and temperature gauge.



02 Nos air-conditioning unit are installed in each VFD sub-station to maintain over all temperature of VFD system and keep a positive air pressure inside sub-station. Normally one unit is on line and another one is stand by.

4.9 AUXILIARY TRANSFORMER

Auxiliary transformer feeds the supply to 400V MCC panel for motor compressor auxiliary transformer Data:

KVA Rating: 750 KVA

Primary voltage: 6.6 KV

Secondary voltage: 400 V

4.10 RING MAIN UNIT

A ring main unit is installed on auxiliary transformer of each VFD system . The purpose of ring main unit is to isolate/ground and re-energize converter transformer and auxiliary transformer locally as per requirement.

5.0 UPS

The 110VAC instrument supply UPS (Uninterrupted Power Supply) System of SFGCS comprises UPS-1 and UPS-2 (2X160KVA) which was installed on April 2005 in place of old UPS-1 and UPS-2 (2X180KVA) as old UPS system. The original configuration of old UPS was such that both the UPS were online in parallel redundant operation and sharing the 110VAC instrument supply load equally having a common i.e. only one static by pass switch. The new UPS-1 and 2 are made in Germany and based on latest IGBT technology with microprocessor control system designed for parallel redundant operation in accordance with our original configuration with built in static by pass switches i.e. two static by pass switches.

5.1 MANUAL BYPASS .

To enable servicing of the system or incase of failure of both inverters the load may be fed from the main supply by inserting the manual bypass link Q7 as per procedure.

UPS DATA

UPS rating; 2X160 KVAInput : 400Vots phase to 400 and neutral, 50 HZBattery bank of each inverter: 415 VDC (2x297 cells Nickel Cadmium

Battery)Out put: 400Volts 3-phase



Distribution through Step down transformer =110VAC, 50Hz.

6.0 SWITCHGEAR TRIPPING SUPPLY

The 110VDC switchgear tripping supply consists of dual chargers and battery bank No.1and 2. Both the chargers and battery banks are connected in parallel to feed the load. Both the chargers are float charging their respective battery bank and feeding the 110VDCsupply load to the 6.6KV HT vacuum circuit breakers and 415Volts Air Circuit Breakers ACBs. 110VDC switch gear tripping supply performs tripping & closing duties of HT VCBs. In case of failure of charger (s) due to internal fault or power shutdown the battery bank supplies the load without any interruption. The availability of 110VDC supply is vital for the protection of the plant’s electrical system, therefore any interruption in 110VDC supply shall trip LT ACBs of Transformer T-9 and T-10 and subsequently the running generators shall trip followed by complete shutdown of the entire plant.

6.1 BATTERY CHARGER PARAMETERS SET UP

There are 27 parameters to be entered in the set-up menu, each field was entered according to the parameter-setting list on the next section and following are the list of parameter fields:

1. Float 2. Equalize3. Equalize Mode 4. Equalize Time5. Auto Equalize6. Floating Time7. Battery Capacity8. High VDC9. Low VDC10. Low Charge Current11. HV Shutdown12. Load Disconnected13. Battery Disconnected14. Battery Hi Temp15. Near Discharge16. End Discharge17. Batt Discharge18. Charger Fail19. Alarm Delay20. Latch Alarm21. Temp Compensation22. Load Share23. Pot Control



24. Grnd Fault25. Current Limit26. B Current Limit27. AC Fail

6.2 THE PROCEDURE TO ACCESS THE PARAMETER SETUP IS AS FOLLOWS :

1. Press SETUP on the keypad.2. Press INC or DEC until desired parameter is displayed on the display.3. Press RIGHT to move the display cursor to the parameter variable field on

thedisplay.

4. Press LEFT to position the cursor at the desired integer.5. Press INC or DEC until desired value is displayed on the display.6. Press LEFT to move the cursor at the next integer.7. Repeat 6 until all integer values are displayed on the display8. Press ENTER to save the value.9. Repeat the above until all parameters are entered into memory as desired.10. To exit set-up, press SETUP.

PARAMETERS DESCRIPTION

SET VALUE

Charger No.1 Charger No.2 RemarksFloat Voltage 128.48 Volt 128.48 Volt

Equalize 140.00 Volt 140.00 Volt

Equalize Mode Manual Only Manual Only

Equalize Time 5.00 Hrs 5.00 Hrs

Auto Equalize 114.00 Volt 114.00 Volt

Floating Time 52.00 Weeks 52.00 Weeks

Battery Capacity 31.00 AH 31.00 AH

High VDC 145.00 Volt 145.00 Volt *

Low VDC 110.00 Volt 110.00 Volt *

Low Charge Current

0.30 Amps 0.30 Amps

HV Shutdown 150.00 Volt 150.00 Volt *

Load Disconnected

88.00 Volt 88.00 Volt ON for local display alarm

Battery Disconnected

88.00 Volt 88.00 Volt ON for local display alarm

Battery Hi Temp 110.00 DegF 110.00 DegF



Near Discharge 98.00 Volt 98.00 Volt *

End Discharge 90.00 Volt 90.00 Volt *

Batt Discharge 0.50 Amp 0.50 Amp

Charger Fail 125.00 Volt 125.00 Volt *

Alarm Delay 1.00 Sec 1.00 Sec

Common Alarm ON ON

Latch Alarm ON ONTemp Compensation

OFF OFF

Load Share 0.50 Volts 0.50 VoltPot Control OFF OFF

Grnd Fault * * *Current Limit ON

Battery Current Limit

50.00 Amp 50.00 Amp

AC Fail * * *

* stands for common alarm inclusion

7.0 LOAD SHEDDING SYSTEM

7.1LOAD SHEDDING SYSTEM ( LSS )

The load shedding system is installed in control room. The purpose of load shedding is to prevent complete power failure or shut down of the plant due to cascade tripping of turbo-generators. Load Shedding System is ensure positive balance between Power Available and Power Generated.

Power Available > Power Generator.

The load shedding system initiate a trip signal to the priority selected feeder such as T-12, OR T-13 OR T-14 in case of tripping of one or two generator out of three running generators. Subsequently in this case power available will become less than power generated (load). The load shedding system trips HT circuit breaker or breakers until positive balance is achieved.

Following is the main features of LSS:-

7.2 MIMIC PANEL



Display, Generators status, HT Circuit breaker status, Active power, Reactive power, Generator current.Display leas bar A & B voltage and frequency.

7.3 OPERATOR CONFIGURATION TABLE

Feeding of generators hot capacity.

Feeding of transformer load.

Feeding of tripping priority of HT circuit breaker.

Feeding of temperature de-rating factor.

8.0 EARTHING SYSTEM

The earthing system is most important in a plant and especially in electrical system and network. Most important is the proper maintenance of earth pits and bars to keep earth network ,working and to provide proper protection to the equipments and human life. The earth network is divided in to following categories,

Computer earth network

Clean earth network

Fram earth network

Plant earth network

Lightning earth network

9. MAINTENANCE OF ELECTRICAL MAIN AND AUXILIARY EQUIPMENT OF SFGCS



Scheduled preventive maintenance of the electrical main and auxiliary equipments is planed and carried out once a year. Scheduled maintenance of all DC power source is performed once a month.

9.1 SCHEDULED PREVENTIVE MAINTENANCE OF MAIN EQUIPMENT .

Following jobs are performed during the maintenance:

9.2 GENERATOR

Inspection, cleaning , insulation test and connection tightness of main generator . Inspection cleaning and connection tightness of exciter stator, rotors and PME . Inspection of rotating diodes. Inspection, Cleaning , connection tightness of generator unit control panel.

Inspection and cleaning of generator anti condensate heaters.

9.3 HT CIRCUIT BREAKERS OF GENERATORS AND TRANSFORMERS

Inspection, cleaning, connection tightness and protection relays testing.HT circuit breakers.Inspection, cleaning, connection tightness and protection relays testing.

9.4 TRANSFORMERS

Inspection, cleaning, connection tightness and buchholz relay testing.Transformer oil testing.

Transformer winding insulation testing.

9.5 EMERGENCY GENERATOR

Inspection, cleaning , insulation test and connection tightness of emergency generator .Inspection cleaning and connection tightness of excitation system Inspection of rotating diodes.Inspection, Cleaning, connection tightness of Diesel engine generator control panel.

9.6 SUL MOTOR

Inspection, cleaning and connection tightness. Insulation resistance testing of DE and NDE sides bearings.

9.7 VFD SYSTEM .

Inspection, cleaning and connection tightness of all VFD panels.Testing of protections.Insulation testing of transformers. Nitrogen purging of converter transformer

9.8 AUXILIARY EQUIPMENT



Scheduled preventive maintenance of turbo-compressors auxiliaries, turbo generators auxiliaries, instrument and plant air compressors main motors and their auxiliaries, chiller units, SUL Motor compressor auxiliaries and Earthing system of the plant is carried out once a year.

9.9 STARTER PANEL

Inspection, cleaning, connection tightness, testing of thermal overload relays, renewal of damaged parts are performed during the scheduled maintenance.

9.10 MOTOR

Inspection and Cleaning of motor fan, fan cover, terminal blocks, exterior cleaning, insulation testing, bridge testing, tightness of motor terminals were performed during scheduled maintenance. Greasing of all fin fan coolers of turbo compressor and turbo generator is also performed during the maintenance.

9.11 LIGHTING SYSTEM

LIGHTING MAINTENANCE

Lighting maintenance of the plant is a continues process. It is beneficial to make a scheduled lighting maintenance plane so that frequent raising of MWOs from Operations depts. could be reduced. The basic purpose of the lighting maintenance plane is as under.

1. Ensure maximum lights of the plant operative.2. Reduce lighting maintenance cost.

It is observed that several lighting MWOs of turbo-compressors out door areas are held up due to unavailability of spare light fittings as tube light fittings installed in out door area are not repairable.

COMPRESSOR HALL LIGHTING .

EXd. Type Emergency tube light fittings are installed in compressor hall, which are easily repairable because complete lighting module is with draw able from Exd. Shell. Locally procured components such as choke, starter and holder can be installed in light fitting. Similarly faulty charger module of the light can be repaired. However faulty battery packs of these light fittings can be removed and light fittings can operate as normal. It is not feasible to renew battery packs due to high cost and probability of their requirement during the black shutdown is very rare.

COMPRESSOR HALL HIGH BAY LIGHTING .



All spare high bay light fitting should be repaired and kept in electrical workshop for installation as per plan. The 250-Watt sodium lamp with out igniter, which are easily available in local market, may be procured for repairing of these light fittings. Replacement and re-lamping of faulty high bay light fittings one may be carried out once a year.

TURBINE ENCLOSURE LIGHTING .

Replacement of fused 160 Watt mercury lamps and emergency bulb planed when turbine stopped condition.

COMPRESSOR AREA OUT DOOR LIGHTING .

The out door light fittings consists of 2ft, 4ft and 5ft tube light fittings. These all new types are repairable.

TURBO GENERATOR HALL AND COOLER AREA. UTILITY AREA .

Easily repairable as locally procured spares such as choke, starter and holder can be use. Locally manufactured light fittings can be installed in place of faulty one.Replacement of fused lamps of turbine enclosure can carried out when train is stopped.

TURBO GENERATOR AND WORKSHOP HIGH BAY LIGHTING .

Repairable as spares are available locally.

CONTROL ROOM/ENGG. OFFICE AND WORKSHOP BLOCK .

Easily repairable as locally procured spares such as choke, starter and holder can be use. Locally manufactured light fittings can be installed in place of faulty one.

PERIMETER AND STREET LIGHTING .

Perimeter lights fittings are repairable with locally procure spares. Choke less 250 Watt sodium lamp with out igniter may also be installed in fitting.

Street light are repairable with locally procured spare.

11. HAZARDOUS AREA EQUIPMENT

A hazardous area is defined as an area in which an explosive atmosphere is present, or may be expected to be present, in quantities such as to require



special precautions for the construction, installation and use of potential ignition sources.Major industries affected would include oil, gas, petroleum refineries, chemical plants, sewerage treatment and grain handling. Other industries include spray-painting shops, aircraft hangars, petrol depots, terminals and garages.Therefore, the use of any electrical apparatus in these areas is strictly controlled through various protection techniques to enable the operators to facilitate the handling or processing of the hazardous materials. This removes the possibility of ignition being caused by the electrical apparatus contained within the hazardous area.Standards Australia prepares, publishes and maintains Australian Standards and in the case of hazardous areas, looks at all aspects of implementing standards that affect the certification, testing, installation and maintenance of electrical equipment in these areas.AIRARISE

INTEMPERATURE,SPARK,ETC.INFLAMMABLESUBSTANCES(GAS,LIQUID,DUST)


over all electrical setup in sfgcs

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