NTPC Ltd. KAHALGAONNTPC Ltd. KAHALGAONVOCATIONAL TRAINING AT THERMAL POWER STATION

NTPC-Kahalgaon NTPC-Kahalgaon At a GlanceAt a Glance

4 x 210 MW USSR make units4 x 210 MW USSR make units 3 x 500 MW BHEL make units.3 x 500 MW BHEL make units.

ST-II Phase - 1 ---- 2 x 500 MWST-II Phase - 1 ---- 2 x 500 MW ST-II Phase - 2 ---- 1 x 500 MWST-II Phase - 2 ---- 1 x 500 MW

OVERVIEWOVERVIEW NTPC KAHALGAON TAKES COAL FROM LALMATIYA COAL NTPC KAHALGAON TAKES COAL FROM LALMATIYA COAL

MINES.MINES. AFTER RECEIVING THE COAL ,IT IS PULVERISED IN COAL AFTER RECEIVING THE COAL ,IT IS PULVERISED IN COAL

HANDLING PLANTHANDLING PLANT THROUGH CONVEYOR BELTS , ITS BEING SENT TO MILLING THROUGH CONVEYOR BELTS , ITS BEING SENT TO MILLING

SYSTEM WHERE IT IS GRINDED.SYSTEM WHERE IT IS GRINDED. THEN IT IS BEING SENT TO BOILER BY PA (PRE-AIR) FAN THEN IT IS BEING SENT TO BOILER BY PA (PRE-AIR) FAN

SYSTEMSYSTEM DM WATER IS SENT TO THE BOILER TUBES BY BFP SYSTEMDM WATER IS SENT TO THE BOILER TUBES BY BFP SYSTEM OXYGEN IS SENT THROUGH FD FAN AND HERE THE WATER IS OXYGEN IS SENT THROUGH FD FAN AND HERE THE WATER IS

CHANGED TO STEAM FORM WHICH IS USED TO ROTATE THE CHANGED TO STEAM FORM WHICH IS USED TO ROTATE THE TURBINE AT 3000 RPMTURBINE AT 3000 RPM

THE GENERATOR ROTOR IS COUPLED WITH THE SAME THE GENERATOR ROTOR IS COUPLED WITH THE SAME TURBINE AND HENCE IT GENERATE ELECTRICAL POWER.TURBINE AND HENCE IT GENERATE ELECTRICAL POWER.

AND THE POWER IS SENT TO THE GRIDAND THE POWER IS SENT TO THE GRID

System coveredSystem covered1)1) BoilerBoiler

2)2) TurbineTurbine

3)3) GeneratorGenerator

4)4) HT/LT aux. power HT/LT aux. power distribution systemdistribution system

5)5) DC system and batteryDC system and battery

6)6) Switch yardSwitch yard

7)7) Electrical LabElectrical Lab

BOILERBOILER

SUPPLIED BY: SUPPLIED BY: 200 MW Unit200 MW Unit USSR/ USSR/ 500MW Units500MW Units BHEL BHEL

TypeType- Natural circulation, Dry bottom, - Natural circulation, Dry bottom, Balanced draft, Convective Reheat, Balanced draft, Convective Reheat, Solid fuel with direct, Tangential fired, Solid fuel with direct, Tangential fired, Pulverized fuel system.Pulverized fuel system.

BOILER MAIN AUXILLIARIESBOILER MAIN AUXILLIARIES: MILL, PA FAN , ID FAN, : MILL, PA FAN , ID FAN, FD FAN, ASH WATER PUMP, SEAL AIR FAN, FD FAN, ASH WATER PUMP, SEAL AIR FAN, SCANNER AIR FAN, SCREW CONVEYOR, CLINKER SCANNER AIR FAN, SCREW CONVEYOR, CLINKER GRINDER.GRINDER.

TURBINETURBINE

200MW LMZ USSR MAKE AND 500MW BHEL MAKE

Type- K 210-130-8, Impulse reaction, Type- K 210-130-8, Impulse reaction, Tandem compound, Reheat type, Closed Tandem compound, Reheat type, Closed cycle with regenerative bleeding.cycle with regenerative bleeding.

Turbine used are-Turbine used are-1.1. high pressure turbine (HPT)high pressure turbine (HPT)2.2. Intermediate pressure turbine (IPT)Intermediate pressure turbine (IPT)3.3. Low pressure turbine (LPT) Low pressure turbine (LPT)

Turbine auxiliariesTurbine auxiliaries: BFP, CEP, GAS COOLER, : BFP, CEP, GAS COOLER, STATOR WATER PUMP, SEAL OIL, LUBE OIL STATOR WATER PUMP, SEAL OIL, LUBE OIL PUMP.PUMP.

Details Of GeneratorDetails Of Generator4 x 210 MW USSR make units4 x 210 MW USSR make units Power ---Power ---247.059MVA, 210MW247.059MVA, 210MWRated voltage ---15.75KVRated voltage ---15.75KVRated current---9056A,Rated current---9056A,Power factor--0.85pf (lag)Power factor--0.85pf (lag)Efficiency--98.55%Efficiency--98.55%Speed and frequency---3000rpm, 50HzSpeed and frequency---3000rpm, 50Hz3 x 500 MW BHEL make units.3 x 500 MW BHEL make units.Rated Output – 500MW, 588MVARated Output – 500MW, 588MVARated Terminal voltage – 21kVRated Terminal voltage – 21kVRated Stator current – 16166 ARated Stator current – 16166 Aspeed and frequency – 3000 rpm and 50Hzspeed and frequency – 3000 rpm and 50HzRated power factor – 0.85 (Lag)Rated power factor – 0.85 (Lag)

GENERATORGENERATOR

Turbo Generators used in NTPC, Kahalgaon are 210 Turbo Generators used in NTPC, Kahalgaon are 210 MW AND 500 MW . MW AND 500 MW . Main Parts:Main Parts:

RotorRotor: cylindrical type, shaft and body forged in : cylindrical type, shaft and body forged in one piece from Nickel-chromium- Vanadium-one piece from Nickel-chromium- Vanadium-molybdenum steel. Slots are milled out axially. molybdenum steel. Slots are milled out axially. Dynamically balanced with high degree of Dynamically balanced with high degree of accuracy up to 20% over speed for 2 minutes. accuracy up to 20% over speed for 2 minutes. Critical speed is at 1200rpm (1370rpm) and 2.7 Critical speed is at 1200rpm (1370rpm) and 2.7 and 3.0 times this speed. and 3.0 times this speed.

StatorStator: cold rolled grain oriented silicon steel, : cold rolled grain oriented silicon steel, mechanically strong to withstand internal pressure mechanically strong to withstand internal pressure of explosion of hydrogen and air mixtureof explosion of hydrogen and air mixtureWindingWinding: 3 phase, double layer, short chorded, : 3 phase, double layer, short chorded, single turn, two parallel winding (double star). single turn, two parallel winding (double star).

Excitation systemExcitation system

Function of Excitation system?Function of Excitation system? Creating and strengthening the magnetic Creating and strengthening the magnetic

field of the generator by passing DC field of the generator by passing DC through the filed winding.through the filed winding.

Importance of Excitation system?Importance of Excitation system? With large alternators in the power With large alternators in the power

system, excitation plays a vital role in the system, excitation plays a vital role in the management of voltage profile and management of voltage profile and reactive power in the grid thus ensuring reactive power in the grid thus ensuring ‘‘StabilityStability’’

STATOR

ROTOR

EXCITATION PRINCIPLE

220V DC SUPLLY

CT

RS11 Q21

R10

R11 UM1 UM2

Q1

QE1

QE11 KM1 FROM DCDB

Q22 FROM STANDBY EXCITOR

QE12

GR

UN1

UN2

AVR

AUM1

AUM2

FV1

GME

AUN1, AVN1

AUN2, AVN2PT

SCHEMATIC OF EXCITATION SYSTEM

Brushless excitationBrushless excitation

PILOT EXCITER

MAIN EXCITER

GENERATOR

FIELD BREAKER

FIELD

(PM)

ARMATURE

ROTATING DIODES

R

Y

B

Components of Brush less Components of Brush less Excitation SystemExcitation System

•Three Phase Main Exciter.•Three Phase Pilot Exciter.•Regulation cubicle•Rectifier Wheels•Exciter Coolers•Metering and supervisory equipment.

PMG

MAIN EXCITER

EXCITER ROTOR

AVR / DVRAVR / DVR

TYPES OF AVR/DVRTYPES OF AVR/DVR

Single channel AVR systemSingle channel AVR system

Dual channel AVR systemDual channel AVR system

Twin channel AVR systemTwin channel AVR system

TYPES OF AVR SYSTEM-TYPES OF AVR SYSTEM-

SSingle channel AVRingle channel AVR : : It consists of two controllers one is It consists of two controllers one is automatic and the other is manual and both the controllers automatic and the other is manual and both the controllers are fed from the same supply are fed from the same supply

Dual channel AVR : Dual channel AVR : It consists of two controllers in the same It consists of two controllers in the same manner as the previous case i.e. one automatic voltage manner as the previous case i.e. one automatic voltage controller and one manual controller. we have different controller and one manual controller. we have different power supply, gate control and pulse amplifier units for power supply, gate control and pulse amplifier units for each of the controllers. Reliability is more in this case than each of the controllers. Reliability is more in this case than previous one since a fault in either gate control unit or previous one since a fault in either gate control unit or pulse amplifier or power supply in single channel AVR will pulse amplifier or power supply in single channel AVR will cause failure of whole unit, but in dual channel AVR this cause failure of whole unit, but in dual channel AVR this can be avoided by switching to another channel.can be avoided by switching to another channel.

Twin channel AVR system:Twin channel AVR system: This system almost resembles This system almost resembles the dual channel AVR but the only difference is that the dual channel AVR but the only difference is that here we have two automatic voltage regulators here we have two automatic voltage regulators instead of one automatic voltage regulator and one instead of one automatic voltage regulator and one manual Voltage regulator manual Voltage regulator

GENERATOR PROTECTION SYSTEM

GENERATOR PROTECTION COMPRISES

1. GENERATOR & ITS EXCITATION SYSTEM

2. GENERATOR TRANSFORMER

3. UNIT TRANSFORMER

4. AUXILLARIES AND THEIR CHANGEOVER TO SERVICE TRANSFORMER SUPPLY.

5. Generator Protection divided in Three Groups based on their function CLASS-A / CLASS-B/ CLASS-C

Class A: The Class A will Class A: The Class A will cause the following cause the following actionsactions

Trip the steam turbineTrip the steam turbine Trip both the 400kv breakers Trip both the 400kv breakers

connected with the unit.connected with the unit. Trip the Field breaker Trip the Field breaker Trip both the UT LV Breakers and Trip both the UT LV Breakers and

will initiate Fast change overwill initiate Fast change over

Class B: The Class B will Class B: The Class B will cause the following actionscause the following actions

Trip both the 400kv breakers Trip both the 400kv breakers connected with the unit.connected with the unit.

Trip the Field breaker Trip the Field breaker Trip both the UT LV Breakers and Trip both the UT LV Breakers and

will initiate Fast change overwill initiate Fast change over

Class C: The Class C will Class C: The Class C will cause the following actioncause the following action

Trip both the 400kv breakers Trip both the 400kv breakers connected with the unit.connected with the unit.

PROTECTIVE RELAYS

HT/LT SWITCHGEAR FOR HT/LT SWITCHGEAR FOR AUXILARY SUPPLYAUXILARY SUPPLY

STN#2 132KV/6.6KV

63MVA

BV02

4BB 4BA 3BB 3BA 2BA 2BB 1BA 1BB

BL02

BM02

B/C, BL -12

BL01

B/C, BM -12

BM01

Generator G.T, 250MVA

UAT, 40MVA

15.75KV/6.6K.V

15.75/400KV

UAT

I/C (B)

UAT

I/C (A)

132KV SWYD

STN#1

BVO1 BWO1

BCO

STN

SWGR

SINGLE LINE DIAGRAM OF HT SWITCHGEARSINGLE LINE DIAGRAM OF HT SWITCHGEAR

BRIEF DESCRIPTION OF 6.6KV HT.SW.GR OF BRIEF DESCRIPTION OF 6.6KV HT.SW.GR OF MAINPLANT SCHEMEMAINPLANT SCHEME

6.6KV switcher of Kahalgaon is designed and supplied by Russia. 6.6KV switcher of Kahalgaon is designed and supplied by Russia. Each Unit consists of Two 6.6KV bushes, Named as BA & BB. Every Each Unit consists of Two 6.6KV bushes, Named as BA & BB. Every bus is charged by two sources, namely station or Reserve Incomer bus is charged by two sources, namely station or Reserve Incomer and UAT or working Incomer. These Incomer are charged by two and UAT or working Incomer. These Incomer are charged by two transformers, i.e. 63 MVA Station Transformer (ST) & 40 MVA Unit transformers, i.e. 63 MVA Station Transformer (ST) & 40 MVA Unit Auxiliary Transformer (UAT). The ST is charged from Switch Yard Auxiliary Transformer (UAT). The ST is charged from Switch Yard 132 KV bus and UAT is charged from its Unit Generator at 132 KV bus and UAT is charged from its Unit Generator at 15.75KV. These transformers are having double secondary 15.75KV. These transformers are having double secondary windings of 6.6KV.windings of 6.6KV.

Generally, the buses are loaded on UAT, when the units are in Generally, the buses are loaded on UAT, when the units are in running condition. When unit trips, Station comes into service by running condition. When unit trips, Station comes into service by AUTO-CHANGE OVER SCHEME (ACO). The ACO scheme operates AUTO-CHANGE OVER SCHEME (ACO). The ACO scheme operates following condition: following condition:

When Group - I protection of Unit operates,When Group - I protection of Unit operates, When Group - II protection of Unit operates,When Group - II protection of Unit operates, Under voltage in the bus, & Under voltage in the bus, & Mechanical Problem in UAT breaker.Mechanical Problem in UAT breaker.

The The Control CircuitControl Circuit takes care of Closing & Tripping of the breaker. takes care of Closing & Tripping of the breaker. It also checks per missives of C&I and Electrical before closing the It also checks per missives of C&I and Electrical before closing the breaker. Apart from above, control circuit gives close or trip breaker. Apart from above, control circuit gives close or trip command to other equipment, e.g. LT incomers, in case of command to other equipment, e.g. LT incomers, in case of Transformer feeders.Transformer feeders.

The The Protection circuit Protection circuit is the heart of any electrical system. is the heart of any electrical system. For all protection circuit, current is drawn from CT of the Breaker For all protection circuit, current is drawn from CT of the Breaker Cabinet and it is fed to all protective relays. Following are the Cabinet and it is fed to all protective relays. Following are the major protections used in our 6.6KV Switch Gear:major protections used in our 6.6KV Switch Gear:

Earth fault protection.Earth fault protection. Short circuit protection (Current Cut - Off),Short circuit protection (Current Cut - Off), Overload Protection,Overload Protection, Arcing Protection,Arcing Protection, Differential Current Protection (Only in BFP feeders),Differential Current Protection (Only in BFP feeders), Under Voltage Protection (Only in Selected feeders),Under Voltage Protection (Only in Selected feeders), Bucholtz Protection ( Only in Transformer feeders),Bucholtz Protection ( Only in Transformer feeders), Temperature (WTI / OTI) Protection (Only in Transformer feeders),Temperature (WTI / OTI) Protection (Only in Transformer feeders), Oil Level (MOG) Protection (Only in Transformer feeders),Oil Level (MOG) Protection (Only in Transformer feeders), Maximum Protection (Only in Transformer feeders).Maximum Protection (Only in Transformer feeders). All the above protection circuit is having a flag relay in series, so All the above protection circuit is having a flag relay in series, so

that it may be defected easily which protection has been that it may be defected easily which protection has been operated.operated.

FUNCTION OF RELAYSFUNCTION OF RELAYS

Over current relayOver current relay: -: - When a fault occurs, the When a fault occurs, the current flowing in the system increases, in most current flowing in the system increases, in most cases the fault current will be many times the cases the fault current will be many times the normal local current. By using a relay responding normal local current. By using a relay responding to the amount of current in the circuit it is to the amount of current in the circuit it is possible to detect the fault and locate and isolate possible to detect the fault and locate and isolate the faulty section.the faulty section.

Differential RelaysDifferential Relays: - This principle is widely : - This principle is widely used to protect generators, transformers, used to protect generators, transformers, transmission lines and station buses. The method transmission lines and station buses. The method compares the current entering and leaving the compares the current entering and leaving the equipment being protected. Under normal equipment being protected. Under normal conditions when there is no fault in the protected conditions when there is no fault in the protected section, these two currents are identical. When section, these two currents are identical. When the fault occurs the currents being compared will the fault occurs the currents being compared will no longer be equal. By measuring its in difference no longer be equal. By measuring its in difference between the currents entering and leaving it is between the currents entering and leaving it is possible to determine the fault.possible to determine the fault.

Directional Relay:Directional Relay: - When a fault occurs it affects the - When a fault occurs it affects the direction of current flow in the system. In some of the direction of current flow in the system. In some of the protective schemes the direction of current flow is used to protective schemes the direction of current flow is used to obtain selective action of the relays.obtain selective action of the relays.

Under Voltage Relay:Under Voltage Relay: - One effect of a short circuit is - One effect of a short circuit is reduction of system voltage. A relay that measures voltage reduction of system voltage. A relay that measures voltage can be used to detect the fault. can be used to detect the fault.

Distance RelayDistance Relay:: - In this type of protective relay, the ratio - In this type of protective relay, the ratio of voltage to current is measured, By this means the relay of voltage to current is measured, By this means the relay can detect a fault and determine the distance between can detect a fault and determine the distance between relay and fault. relay and fault.

Balanced current Relay:-Balanced current Relay:- When two identical When two identical transmission lines operate in parallel, the currents in the transmission lines operate in parallel, the currents in the two lines are equal. If a fault occurs on one line the currents two lines are equal. If a fault occurs on one line the currents become unbalanced. This condition can be used to detect become unbalanced. This condition can be used to detect the fault.the fault.

Timer Relay:Timer Relay: - The factor of time aids in determining what - The factor of time aids in determining what part of system is to be disconnected after occurrence of a part of system is to be disconnected after occurrence of a fault. For example, transmission line protection utilizes this fault. For example, transmission line protection utilizes this principle of zones in distance relays by providing timers.principle of zones in distance relays by providing timers.

DC IS THE NERVOUS SYSTEM OF DC IS THE NERVOUS SYSTEM OF ELECTRICALELECTRICAL

EQUIPMENTS CONTROL AND EQUIPMENTS CONTROL AND PROTECTIONPROTECTION

DC SYSTEM COMPRISES OF :DC SYSTEM COMPRISES OF : 1. DCDB1. DCDB

2. CHARGER.2. CHARGER.

3. BACKUP BATTERY BANK.3. BACKUP BATTERY BANK. LEAD ACID BATTERYLEAD ACID BATTERY NI-CD BATTERY BANKNI-CD BATTERY BANK

BATTERY VOLTAGES & SP GRAVITY MONITORING

SWITCHYARD AND DIFFERENTSWITCHYARD AND DIFFERENTSWITCHING EQUIPMENTSSWITCHING EQUIPMENTS

252

452

552

652

ICT 2 BSF 1

752

852

952

BSF 2

BSF 3

2852

2952

3052

MTN 1FKK 2

1052

1152

1252

BR# 1 U#2

152

352

ICT 1 U# 1

2252

2452

U#4

1652

1752

BSF 4

400 KV BUS 1

400 KV BUS 2

1352

1452

1552

U#3 BR#2

2052

2152

MTN 2

2552

2752

U#5

3152

3252

3352

FKK 1 PAT 2

PAT 1

4152

4052

U#6

3652

3452

U#7

3952

3752

SINGLE LINE DIAGRAM OF 400 KV SWYD KAHALGAON

What is a Switchyard ?What is a Switchyard ?

It is a switching station which has the following It is a switching station which has the following credits : credits :

(i) Main link between Generating plant and (i) Main link between Generating plant and Transmission / Distribution system. Transmission / Distribution system.

(ii) Step-up and/or Step-down the voltage (ii) Step-up and/or Step-down the voltage

levels depending upon the Network Node.levels depending upon the Network Node.

(iii) Switching ON/OFF Reactive Power Control (iii) Switching ON/OFF Reactive Power Control devices, which has effect on Quality of power. devices, which has effect on Quality of power.

(iv) Switching ON/OFF different lines with (iv) Switching ON/OFF different lines with safety and security. safety and security.

SWITCHYARD SWITCHYARD EQUIPMENTSEQUIPMENTS

Equipments commonly found in switchyard :Equipments commonly found in switchyard :

1.1. Lightening arrestorLightening arrestor

2.2. Current transformerCurrent transformer

3.3. Voltage transformerVoltage transformer

4.4. Power transformers / I.C.T.Power transformers / I.C.T.

5.5. Bus bar and clamp fittingsBus bar and clamp fittings

6.6. Support structureSupport structure

7.7. IsolatorsIsolators

8.8. Circuit BreakerCircuit Breaker

9.9. Wave trapsWave traps

10.10. Earthing switchEarthing switch

Functions of various equipment :Functions of various equipment :

* * TransformersTransformers : : - Transforms the voltage levels from higher to lower level - Transforms the voltage levels from higher to lower level or vice versa, keeping the power constant.or vice versa, keeping the power constant. * * Circuit breakers :Circuit breakers : - Makes or automatically breaks the electrical circuits under - Makes or automatically breaks the electrical circuits under

Loaded condition.Loaded condition. * * Isolators :Isolators : - Opens or closes the electrical circuits under No-load - Opens or closes the electrical circuits under No-load

conditions. conditions. ** Instrument transformers : Instrument transformers : - For stepping-down the electrical parameter (Voltage or - For stepping-down the electrical parameter (Voltage or

Current) to a lower and safe value for Metering and Current) to a lower and safe value for Metering and Protection Protection logics.logics.

* * Earth switch :Earth switch : - Used to connect the charged body to ground to discharge the trapped - Used to connect the charged body to ground to discharge the trapped

charge to have a safe maintenance zone.charge to have a safe maintenance zone.

* * Lightning arrestorsLightning arrestors : : - Safe guards the equipment by discharging the high - Safe guards the equipment by discharging the high

currents due to Lightning.currents due to Lightning. * * Overhead earth wireOverhead earth wire : : - Protects the O/H transmission line from Lightning - Protects the O/H transmission line from Lightning

strokes. strokes. * * Bus barBus bar : : - Conductors to which a number of circuits are - Conductors to which a number of circuits are

connected.connected. * Wave Traps/Line traps :* Wave Traps/Line traps : - Used in PLCC circuits for Communication and - Used in PLCC circuits for Communication and

telemetering.telemetering. * * Reactive Power control devicesReactive Power control devices : : - Controls the reactive power imbalance in the grid - Controls the reactive power imbalance in the grid

by switching ON/OFF the Shunt Reactors, Shunt Capacitors by switching ON/OFF the Shunt Reactors, Shunt Capacitors etc.,etc.,

* * Current Limiting ReactorsCurrent Limiting Reactors : : - Limits the Short circuit currents in case of faulty - Limits the Short circuit currents in case of faulty

conditions.conditions.

VIEW OF 400 KV SWYD

SWYD EQUIPMENTS

Current transformersCurrent transformers

FUNCTION :FUNCTION :

- To step-down the high magnitude - To step-down the high magnitude of current to a safe value to incorporate of current to a safe value to incorporate Measuring and Protection logicsMeasuring and Protection logics

- Current transformers are used for - Current transformers are used for the instrumentation, protection or the instrumentation, protection or metering of power systems.metering of power systems.

VT / CVTVT / CVT

FUNCTION FUNCTION :: - To step-down the high magnitude - To step-down the high magnitude

of voltage to a safe value to incorporate of voltage to a safe value to incorporate Measuring and Protection logics. Measuring and Protection logics.

Voltage transformers serve a number of Voltage transformers serve a number of functions in a power system. VT‘s are functions in a power system. VT‘s are used for the operation of many types used for the operation of many types of instrumentation and relay protective of instrumentation and relay protective systems. They measure voltage and in systems. They measure voltage and in conjunction with CT , they measure conjunction with CT , they measure power. They feed synchronizing power. They feed synchronizing equipment. They can be used as equipment. They can be used as coupling capacitors in power line coupling capacitors in power line carrier network. carrier network.

LIGHTNING ARRESTORSLIGHTNING ARRESTORS FUNCTION :FUNCTION :

- To discharge the high voltage surges - To discharge the high voltage surges in the power system due to lightning to in the power system due to lightning to the ground. the ground.

Apparatus to be protected :Apparatus to be protected :

* Overhead lines………Earth/Ground * Overhead lines………Earth/Ground wireswires

* HV equipment………LAs* HV equipment………LAs

* Substation…………...Lightning Masts, * Substation…………...Lightning Masts, Earth wiresEarth wires

FEATURES OF EARTH SWITCHESFEATURES OF EARTH SWITCHES

SAFETY DEVICE.SAFETY DEVICE. USED TO GROUND THE PARTICULAR USED TO GROUND THE PARTICULAR

SECTIONS REQUIRED FOR MAINTENANCE.SECTIONS REQUIRED FOR MAINTENANCE. GROUND INDUCTION VOLTAGES.GROUND INDUCTION VOLTAGES. INTERLOCKED WITH BREAKERS AND INTERLOCKED WITH BREAKERS AND

ISOLATORSISOLATORS CAN OPERATE FROM LOCAL ONLYCAN OPERATE FROM LOCAL ONLY MOTOR DRIVEN AS WELL AS HAND DRIVENMOTOR DRIVEN AS WELL AS HAND DRIVEN

FEATURES OF ISOLATORSFEATURES OF ISOLATORS OPERATES UNDER NO LOAD CONDITIONOPERATES UNDER NO LOAD CONDITION INTERLOCKED WITH BREAKERS AND INTERLOCKED WITH BREAKERS AND

EARTHSWITCHESEARTHSWITCHES SHOULD WITHSTAND EXTREME WIND SHOULD WITHSTAND EXTREME WIND

PRESSURESPRESSURES MOTOR DRIVEN AND HAND DRIVENMOTOR DRIVEN AND HAND DRIVEN LOCAL AS WELL AS REMOTE OPERATION LOCAL AS WELL AS REMOTE OPERATION

POSSIBLEPOSSIBLE ISOLATES SECTIONS FOR MAINTENANCEISOLATES SECTIONS FOR MAINTENANCE USED TO SELECT BUS BARSUSED TO SELECT BUS BARS CT SWITCHING FOR BUS BAR PROTECTIONCT SWITCHING FOR BUS BAR PROTECTION

ELECT LABORATORYELECT LABORATORY FunctionFunction: To carry out the testing and : To carry out the testing and

calibration of different Elect. calibration of different Elect. equipments. equipments.

InstrumentInstrument : Multimeter, Megger, Tong : Multimeter, Megger, Tong tester, Ductor meter, LCR meter, DSO, tester, Ductor meter, LCR meter, DSO, DLRO, Tan-Delta Test Kit, OIL BDV Test DLRO, Tan-Delta Test Kit, OIL BDV Test Kit, Automatic Battery discharge Kit, Kit, Automatic Battery discharge Kit, Automatic Relay test kit, Primary Automatic Relay test kit, Primary Current Inj Kit, HV Test Kit, Cable Fault Current Inj Kit, HV Test Kit, Cable Fault Locator, IC Tester, Motor checker, Locator, IC Tester, Motor checker, Leakage Current tester, Power Leakage Current tester, Power analyzer.analyzer.

Thank youThank you