Training diary copy

STEAG O&M COMPANY (SOMC)
FIELD TRAINING DIARY
FOR
SEMI SKILLED TECHNICIANS
Name of Technician:
Employee Code: Prepared by:
SAHADEVA RAULA

SCHEDULE OF 15 WEEKS FIELD TRAINING
Sr No. Electrical Equipment Durationin weeks
1 Transformers 2
2 HT Switch Gear 1.5
3 LT Switch Gear 1.5
4 HT Motor 0.5
5 LT Motor 0.5
6 MCC Feeders 1
7 ACDB(Inverter/UPS) 0.5
8 DCDB(Rectifier/Charger) 0.5
9
VFD(VariableFrequency Drive)& Synchronous
Motor
1.5
10 DC Motor & Starter panel 0.5
11 ESP(Electro Static Precipitator) 1.5
12 Generator & Excitation System 1.5
13 Relay Protection System of Generator and Motor 1
14 InstrumentTransformer 0.5
15 DG Set 0.5

TRANSFORMER
Location, rating and types of transformer, Types of cooling system, Parts of transformer,
Function of breather and silica gel, Function of conservator, Function of buchholz relay, type
and function of Tap changer , Transformer testing , Different types of protections for
transformer, Quality of transformer oil, Testing procedures of transformer oil, Shut down
maintenance check list of transformer.
SPECIFICATION OF SOME TRANSFORMERS IN PLANT AREA:
GENERATOR TRANSFORMER:
Rating-216MVA /1Ph /3 Nos.,Pr.Volt- 21kv, Sec.Volt-400KV/50Hz
Pr.current-10285Amp., Sec.current-890Amp., Cooling- ONAN/ONAF/OFAF
Impedence-15%, Service- Out door type, Duty- continuous.
Winding connection- Pr-∆ , Sec- Y , Vector group – Ynd11
Winding insulation- Pr-Li 125, AC-50, Sec- Si 1050, Li 1425, AC -50, Tap control – Off load
STATION TRANSFORMER:
Rated output-90/45-45MVA, Pr.Volt-400kv/3ph /50Hz ,Sec.Volt—11kv/50hz/3ph ,
Pr.current-130Amp. , Sec.current- 2260Amp. , Cooling – ONAF, Duty – continuous ,
Vector group – Ynoyno, Tap control – on load,
UNIT TRANSFORMER:
Rated output – 25/20MVA, Pr.Volt -22.5kv/3ph/50Hz, Sec.volt – 11kv/3ph/50hz,
Pr.Current – 680Amp.Sec.Current – 1250Amp. Duty- continuous,
Cooling –ONAF/ONAN.

UAT TRANSFORMER :
Rated output -16MVA ,Pr.Volt- 11kv/3ph/50hz , Sec.Volt- 3.3kv/3ph/50hz ,
Pr.current- 840Amp. , Sec.current- 2642Amp. , Cooling- ONAN,
Duty- continuous, Vector group- Dyn1, Winding insulation – class A ,
Tap control – Off load.
DRY TYPE TRANSFORMER (STACKER & RECLAIMER):
Rated output - 800KVA, Volt.Ratio -3.3/0.433KV, Hz-50, Ph-3, Cooling – AN,
Vector group – Dyn11, Winding insulation –Class F, Protection class- IP44.
PARTS OF TRANSFORMER:
1. Primary Winding
2. Secondary Winding
3. Core
4. Conservator
5. Breather & Silica jell
6. Buchholtz Relay
7. Tap changer
8. Pressure release valve
9. Drain valve
10. Primary&Secondary Bushing
11. Neutral Bushing
12. Transformer Oil
TRANSFORMER TESTING:
1. IR Value Test
2. PI Value Test
3. Voltage Ratio Test
4. Magnetic Balance Test

5. Open Circuit Test
6. Short Circuit Test
7. Over Voltage withstand Test
8. Phase Current Unbalance Test
QUALITY OF TRANSFORMER OIL:
1) Transformer oil should be free from moisture and suspended particles.
2) Flash point should be > 160®C.
3) Viscosity should be 30 at 15 ®C.
4) Density should be 0.89.
5) KOH (alkali) in transformer oil should not be more then 0.03/1gm of oil.
6) Moisture should be less than 35ppm.
Out of the above properties, the transformer oil should be filtered or replaced.
TESTING OF TRANSFORMER OIL:
1. BDV TEST
2. ACIDITYTEST
3. CRACKLETEST
4. MOISTURE TEST
SHUT DOWN MAINTENANCE CHECK LIST OF TRANSFORMER:
1. Obtain PTW and ensure isolation of power supply.
2. Cleaning of transformer body properly.
3. Cleaning of bushing with non-fluffy cloth.
4. Check the tightness of primary and secondary side cable connection and healthiness of
Expansion bellow.
5. Check any crack or damage on the bush.
6. Check TX. Oil leakage.

7. Check Breather Silica jell (blue, when dry)
8. Check for oil in the Breather Housing cup, if required top up.
9. Check the oil level in the Conservator tank.
10. Clean the radiator pins and check for any leakages.
11. Clean the marshalling box.
12. Check the tightness of control wiring in the marshalling box.
13. Check the oil pump motor condition &it’s IR value.
14. Check the fan motor condition &it’s IR value.
15. Check the buchholz relay, oil level indicator pressure gauge, temp.indicator (WTI, OTI).
16. Check BDV of TX. Oil.
17. Close the PTW after work completed.
ELECTRICAL FAULT IN TRANSFORMER:
1. Bushing fault.
2. Winding fault.
3. Inter turn fault.
4. Core fault.
5. Tape changer fault.

From………………………………………………………………….To………………………………………………………………………………..
Date……………………………….
Scheduled Activity for the day : TRANSFORMER
Describe the activitycoveredduringthe day:
Describe keylearningpointsof the day:
Signature of Trainer
Signature of Trainee

From………………………………………………To………………………………………………………………………………..
Date…………………………
ScheduledActivityforthe day:
TRANSFORMER
At the end of prescribed
durationof the field training of
particular equipment ,
summaries your knowledge:

HT SWITCHGEAR
Location of HTSwitchgears,HT power distribution with voltage level,
Use & function of HT breaker, parts of HT breaker,
Function of closing coil, function of tripping coil, function of anti-pumping relay.
PARTS OF HT BREAKER:
1. Closing coil & closing mechanism.
2. Tripping coil & tripping mechanism.
3. Vacuum gas (sf6) cylinder.
4. Anti-pumping relay.
5. Auxiliary relay.
6. Rack in/Rack out.
7. Arc chute.
8. Earth switch.
9. Spring charging.
Specification details of some HT breakers:
 HT breaker of Station Transformer:
Voltage 12kV /50HZ , circuit current 1600A , Bus bar current 1600A.
 HT breaker of Unit Auxiliary Transformer:
Voltage 12kV /50HZ, circuit current 1250A, Bus bar current 1600A.
 HT breaker of MDNFOP motor:
Voltage 12kV /50HZ, circuit current 1250A, Bus bar current 3150A.
PREVENTIVE MAINTENANCE CHECKLIST OF HT BREAKER:
1. Ensure power isolation with work permit.
2. Draw out the breaker carefully.
3. Clean breaker with blower/brush/marking cloth.

4. Check control circuit tightness.
5. Check panel Indication lamps working condition.
6. Check the service/test position limit condition.
7. Check the freeness of breaker rack in/ rack out mechanism, apply lubricant.
8. Check the breaker spring charging motor condition.
9. Measure the resistance of closing coil and tripping coil.
10. Check the multi-function meter condition.
11. Check the IR value of all poles pole to pole and pole to ground.
12. Check the relay setting.
13. Close the work permit after completion of work.

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Date……………………………….
ScheduledActivityforthe day: HT SWITCHGEAR

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Date…………………………
HT SWITCHGEAR
duration of the field training
of particular equipment ,

LT SWITCHGEAR
Location, LT Power Distribution with voltage level, use and function of LT Breaker, Parts of LT
Breaker, Function of Closing Coil &tripping coil, function of anti-pumping relay.
PARTS OF LT BREAKER(ACB):
 Closing Coil & its mechanism.
 Tripping Coil & its mechanism.
 Spring charging motor
 Anti-pumping Relay.
 Auxiliary Relay
 Rack in/Rack out mechanism
 Arc Chute
SPECIFICATION DETAILS OF LT BREAKERS
LT Breaker of AOP: - In -800V, Ui- 1000V, F-50HZ, Ics-50KA,Icw-50KA.
PM CHECKLIST OF LT SWITCHGEAR (ACB)
 Obtain PTW and ensure the isolation of power supply.
 Draw out the ACB carefully and clean with air blower/brush.
 Check the guide rails for proper movement and apply lubricant to the rail.
 Clean the arc chute.
 Clean the moving contact & apply lubricant.
 Check the breaker spring charging motor resistance & its control circuit
 Check the closing coil & tripping coil resistance.
 Check the IR value of poles (Ph-Ph & Ph-GND)
 Check the tightness of power cable connection.
 Close the permit after work completed.

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Date……………………………….
ScheduledActivityforthe day: LT SWITCHGEAR

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Date…………………………
LT SWITCHGEAR

HT MOTOR
Location &purpose of HT Motor, Parts of HT Motor, Use of HT Motor, voltage level of HT Motor,
testing and fault finding of HT Motor, preventive maintenance of HT Motor, its cable size &
type.
PARTS OF HT MOTORS
 Rotor and its winding
 Stator and its winding.
 Rotor Shaft
 Bearings
 End covers
 Cooling Fan & its cover
 Air Cooler
 Terminal Box and Terminal Block
 Greasing Nipple
 Motor Casting Body
SPECIFICATION DETAILS OF SOME HT MOTORS:
 CEP MOTOR
KW-900KW,Volt-3.3KV/3ф/50 Hz, RPM-1489.
Current-195 Amp, Temperature-50⁰C, Connection-Y
Protection- IP55,Make-BHEL
 PA FAN MOTOR
KW-3900KW, Volt-11KV/3ф/50 Hz, RPM-1492.
Protection- IP50, Make-BHEL, Ic-511.

 FD FAN MOTOR
KW-1325KW, Volt-11KV/3ф/50 Hz, RPM-994
Protection- IP55, Make-BHEL
PREVENTIVE MAINTENANCE CHECKLIST OF HT MOTOR:
 Ensure Power Isolation with work permit.
 Cleanliness of the motor.
 Double Earthing connection.
 Terminal tightness.
 Terminal Box Condition.
 Cooling Fan Condition.
 DE/NDE Bearing Temperature Indicator condition.
 Motor Body Condition.
 Motor Bearing Greasing as per schedule.
 Motor Space Heater Condition.
 Motor EPB Condition.
 Motor winding WR/IR Value and PI Value with cable &without cable.
 Close the PTW after work completed.

From………………………………………………………………….To………………………………………………………………………………..
Date……………………………….
ScheduledActivityforthe day: HT MOTOR
Describe key learningpointsof the day:

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Date…………………………
HT MOTOR
duration of the field training of

LT MOTOR
 Locationand purpose of LT motor
 Parts of LT motor
 Use of LT motor
 Voltage level of LTmotor
 Testingandfaultfindingof LT motor
 Preventivemaintenanceof LT motor
 Cable type andsize of LT motor
SPECIFICATION DETAILS OF SOMELT MOTOR:
 ClinkerGrinder:
KW-7.5
Volt-415v/3ᶲ/50Hz
Amp-14.8
RPM-1450
 TDBFP LOP Motor:
KW-90, Volt-415v/3ᶲ/50Hz
Amp-147, RPM-1480
IP-55, Duty-51
Temp-50°C
 Vacuum Pump:
KW-132, Volt-415v/3ᶲ/50Hz
Amp-267, RPM-590
IP-55
 AC Seal Oil Pump(ACSOP):
KW-7.5, Volt-415v/3ᶲ/50Hz
Amp-13.79, RPM-1455
IP-55, Duty-51

TYPES OF LT MOTOR:
1. Squirrel cage motor
2. Slipping motor
3. Synchronousmotor
PARTS OF LT MOTOR:
1. Stator winding
2. Rotor
3. Rotor shaft
4. Bearing
5. End cover
6. Coolingfanwithcover
PREVENTIVE MAINTENANCEOF LTMOTOR:
1. ObtainPTW and confirmthe isolationof power
2. Cleanthe motorbody
3. OpenTB and cleanitthencheck tightnessof cable connection
4. Checkthe conditionof coolingfan
5. CheckIR value of motor(UE/VE/WE/UV/VW/WUforLT>2MΩ,for HT>14MΩ & HT VFD>2MΩ)
6. Check resistance value of motorwinding
7. Checkthe motor space heaterresistance
8. Checkthe Earthlingconnectiontomotorbody
9. Close PTWafter workcompleted

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Date……………………………….
ScheduledActivityforthe day: LT MOTOR

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LT MOTOR

MCC FEEDER
 Locationand purpose of MCC feeder
 Powerdistribution
 Spare parts available inthe feeder
SPAREPARTS AVAILABLEIN MCC FEEDER:
1. Incomingbreaker
2. Relayprotectioncircuit
3. Space heater
4. Feeders:
a) Starter(Y-∆ / DOL /FR DOL)
b) SFU
c) Fuse
d) OLR
e) 1ᶲ preventer
f) Start/stoppushbutton
g) Selectorswitch
PM CHECKLIST OF MCC:
1. ObtainPTW and ensure the isolationof powersupply
2. Draw out the feedertrolleycarefullyandcleanitwithvacuumcleaner/blower/brush
3. Inspectthe module foranyburningof leadsanddamage to any component
4. Remove powercontactorcoverand checkthe fixing/movingcontactsforany signsof erosion
and pitting,if requiredreplace the spare kits
5. Checkthe tightnessof powercable andcontrol cables
6. Checkthe guide railsforpropermovementandapplylubricanttothe rail
7. Checkthe jaw contactsof incomingandoutgoingpowercircuit
8. Check tightnessandalignmentof slidingcontact
9. Checkthe conditionof MCCB handle anditsproperoperation
10. Checkthe healthinessof overloadprotectionsystem.

From………………………………………………………………….To………………………………………………………………………………..
Date……………………………….
ScheduledActivityforthe day: MCC FEEDER

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Date…………………………
MCC FEEDER

ACDB(INVERTER & CONVERTER)
 Location
 Rating
 purpose of Battery
 purpose of ACDB
 Powerdistribution systemof ACDB
 Preventivemaintenanceof ACDB
LOCATION OF ACDB:
 Unit service ACDB
 BoilerACDB
SECTION OF ACDB:
1. Incomingbreaker
2. Stepdowntransformer
3. Rectifiercircuit
4. Charger
5. Batterybank
6. Invertercircuit
7. AC powerdistributioncircuit
PM CHECKLIST OF ACDB:
1. ObtainPTW and ensure isolationof powersupply.
2. Cleanthe panel & batterybankusingblower.
3. Checktightnessof all TB connections.
4. Checkthe specificgravity(1150-1250)of battery.
5. Checkthe waterlevel of battery,if requiredthentopup.
6. Checkthe conditionof thermistors inthe rectifierandinverterbridge.
7. Checkthe tightnessof all outgoingcablesinthe ac distributionpanel.
8. Checkthe panel LED’s conditionbydigital multimeter.
9. Checkthe condition of fuse &MCB in the ACdistributionpanel.
10. Close the permitafterworkcompleted.

From………………………………………………………………….To………………………………………………………………………………..
Date……………………………….
ScheduledActivityforthe day: ACDB (INVERTER& CONVERTER):

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Date…………………………
ACDB (INVERTER& CONVERTER)

DCDB (RECTIFIER AND BATTERY CHARGER)
Location, Rating, Purpose of Battery Charger, Battery Rating, Power Distribution System of
DCDB, Preventive Maintenance of DCDB and Battery.
LOCATIONS OF DCDB:
 Unit & Station DCDB
 Switchyard DCDB
 JNT-5 DCDB
 CCW System DCDB
SECTIONS OF DCDB
 Incoming Breaker
 Step-down Transformer
 Rectifier
 Charger
 Battery Bank
 DC Power Distribution Circuit
SHUT DOWN MAINTENANCE CHECK LIST OF DCDB :
 Obtain PTW and ensure isolation of Power Supply in DCDB Panel.
 Clean the Panel & Battery Bank using Blower.
 Check Tightness of all TB Connections.
 Check Specific Gravity of Battery (1150-1250).
 Check the Water Level of Battery, if required top-up it.
 Check the condition of thynistors in the Rectifier Bridge.
 Check the tightness of all outgoing cables in the DC Distribution Panel.
 Check the condition of fuses&MCB in the Distribution Panel.
 Close the PTW, after work completed.

From………………………………………………………………….To………………………………………………………………………………..
Date……………………………….
ScheduledActivityforthe day: DCDB (RECTIFIERAND BATTERY CHARGER)

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Date…………………………
DCDB (RECTIFIER AND BATTERY CHARGER)

VFD(AC DRIVE) & SYNCHRONOUS MOTOR
Location, Rating & Purpose of VFD, Different Section of VFD, Preventive Maintenance ,Check
Listof VFD, TX and Motor connected to VFD , part of synchronous motor ,fault finding &
rectification.
SPECIFICATION DETAILS OF SYNCHRONOUS MOTOR
 Motor Rating: - 4500KW, Current: - 300Amp, Rpm: - 570.
 Stator Voltage:- 2300V, Current:- 619Amp, Connection:-Y
 Brush Less Exciter Input:- 300 VAC, 57Amp,Connection-Y
 Brush Less Exciter Output:-57VDC,300ADC,574Rpm,97.8Hz
DIFFERENT SECTIONS OF SYNCHRONOUS MOTOR
 Motor Rotor
 Motor Stator
 Shaft&Bearings
 End Cover
 Bearings
 Exciter Rotor& Stator
DIFFERENT SECTION OF VFD
 Step down TX (3250KVA, 11KV/2300Volt)
 AC Line Reactor(10MH)
 Converter Bridge
 Inverter Bridge
 Neumeric Logic Control & Protection Device.
 AC Voltage Regular Circuit for Motor Excitor.
PREVENTIVE MAINTENANCE CHECK LIST
 Ensure Power Isolation with PTW.
 Clean the VFD Panel all companntment with Blower/Vacuum Cleaner/Marking Cloth.
 Check Tightness of Power Cable and Control Cable.
 Check the condition of cooling fans.

 Check Tightness of Earthings to Panel.
 Clean the Motor &Exciter with Blower.
 Check the Tightness of Power Cable Connection.
 Check the IR& PI Value of Stator & Cables.
 Check Earthling Tightness of Motor.
 Close the Permit after work Completed.

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Date……………………………….
ScheduledActivityforthe day: VFD(ACDRIVE) & SYNCHRONOUSMOTOR

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Date…………………………
VFD (AC DRIVE) & SYNCHRONOUS MOTOR

DC MOTOR & STARTERPANEL
Location, Rating, Use of DC Drive, Different Section of DC Drive, Different Part of DC Motor.
Preventive Maintenance of DC Motor & DC Drive. Fault finding & Rectification.
LOCATION OF SOME DC MOTOR
 JOP DC Motor
 SOP DC Motor
 TDBFP DC Motor
 Scanner Air Cooling Fan DC Motor
 EOP DC Motor
PART OF DC MOTOR
 Armature Winding
 Field Winding
 Armature Shaft
 Commutator
 Carbon Brush with Holder
 Bearing
 Cooling Fan
DIFFERENT TYPES OF DC MOTOR
 Shunt Motor
 Series Motor
 Compound Motor
PREVENTIVE MAINTENANCE CHECK LIST
 Obtain PTW and Ensure the Power Isolation of DC Drive.
 Clean the Starter Panel & Motor with Blower.
 Clean the Commutator with Marking Cloth.
 Check worn out of Carbon Brush and its holder spring tension, if required replaced it.
 Clean the motor TB ,Check the Tightness of Cable connection in motor and starter panel.
 Check the Tightness of Cable connection in the motor TB and in the Starter Panel.

 Check the IR value of Field Winding and Armature Winding of DC Motor.
 Check the continuity of starter resistor.
 Check the Jaw Contact Condition of power contactor in the starter panel.
 Check the setting of DC OLR.
 Check the Operating Condition of SFU.
 Check the continuity of starting resistor.
 Check the Jaw Contact Condition of power contactor in the starter panel .
 Check the setting of DC OLR.
 Check the Operating Condition of SFU.

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Scheduled Activity for the day :

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ESP (ELECTRO STATIC PRECIPITATOR)
Location , purpose of ESP, Rating of each Rectifier Transformer, Numbers of RTX, Function of
Electronic Control Panel (ECP), Heaters for Shaft Insulator, Support Insulator& Hopper. Function
of Emitting &Collecting Plate, Gap between Emitter and Collector Plate.
SPECIFICATION DETAIL S OF RECTIFIER TRANSFORMER:
Rating: - 118KVA, Step up Transformer, Make: - BHEL
Secondary Volt:-74KVA (1ф), Secondary Current: - 1.6Amp (1600MA)
Primary Volt: - 373 Volt (2ф) , Primary Current:- 316Amp.
Type of Cooling: - ONAN, WindingTemperature-55⁰C.
After Rectifier: - 95KV DC (Peak)/1200MA.
FUNCTION OF ELECTRONIC CONTROLLER
 Change Ratio Setting
 Under Voltage Management
 Rectifier Transformer OCSC Test
 Thynistor Failure Detection.
EQUIPMENTS AVAILABLE IN ESP
 Electronic Control Panel
 Rectifier Transformer
 EHT Earth Switch
 Support Insulator
 Shaft Insulator
 Space Heater
 Collecting Plate
 Emitting Plate
 ERM(Emitter Rapping Motor)
 CRM(Collector Rapping Motor)
 Hopper Heater
 Ash Level Indicator

SHUTDOWN MAINTENANCE CHECK LIST OF ESP :
 Obtain PTW and ensure power isolation of ESP Section.
 Clean the Electronic Control Panel and check tightness of all wiring terminal connection.
 Clean the ERM& CRMControl Panel and check the tightness of all wiring terminal
connection.
 Clean the body of ERM/CRM Motor & Check Power Cable tightness in TB.
 Check WR/IR Value of CRM/ERM.
 Check all the Space Heaters conditions, if require replace with new heaters.
 Clean all the Shaft Insulator and check its condition, if damaged replace it.
 Clean all the Support Insulator and check any damage, if require replace it.
 Disconnect Knife Switch (-ve) of Rectifier and clean the Bushing Insulator.
 Clean the Rectifier TX. Check silica Jell condition, check transformer Oil Level, if require
top up it.
 Check the IR Value of ESP Field.
 Now normalise the Knife Switch of RTX.
 Take trial of OC/SC Test ,after getting clearance from other concerned Departments.

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Date……………………………….
ScheduledActivityforthe day: ESP (ELECTRO STATICPRECIPITATOR)

From………………………………………………To………………………………………………………………………………..
Date…………………………
ESP (ELECTRO STATIC PRECIPITATOR)
Describe the activitycovered duringthe day:

GENERATOR & EXCITATION SYSTEM
Location, Rating, Different Section of Generator, Different Section of Exciter, Stator& Rotor
Cooling System, Purpose of PMG Exciter, Purpose of AVR, Use of Rectifier Wheel, Shutdown
maintenance check list.
SPECIFICATION DETAILS OF GENERATOR
Rating - 520MW/611MVA, RPM - 3000, Cos ф - 0.85.
Type - THDF 115/59, Insulatio: - Class F,
Stator Volt - 21KV/Stator Current - 16800Amp, Connection - Y,
Cooling System- DM Water cooling
Rotor Volt - 330VDC, Rotor Current - 4000Amp, Cooling system- H2 Cooling.
Main Excitor - 1500KW/4000 Amp, 330V
Pilot Excitor - 65KVA (Reactive)/200Amp/220V/400HZ 16 Pole.
SECTION OF GENERATOR
 Rotor Winding
 Stator Winding
 Rotor Shaft & Bearings
 Rotor H2 Cooling Header
 Stator Water Cooling Tube
 Power TB with Flexible links with Torrent C.T.
 LA PT Panel
 NGR
 NGT
 Rotor Earthing
 Stator Earthing
 IPBD (Individual Phase Bus Duct)
 IPBD Hot Air Blower.

DIFFERENT SECTION OF EXCITATION SYSTEM
 Permanent Magnet Pilot Excitor.
 Automatic Voltage Regulator.
 3ф Main Excitor.
 Rectifier Wheel.
 Stroboscope to Monitor Fuses.
 Anti-Condensation Heater to avoid formation of moisture.
SHUTDOWN MAINTENANCE CHECK LIST OF GENERATOR & EXCITOR:
 Obtain PTW and confirm the isolation from switchyard.
 Cleaning and tightness checking of flexible links in generator.
 Cleaning and tightness checking of cable in exciter.
 Cleaning & tightness checking of control wiring terminals in the AVR Panel
 Cleaning & terminals tightness checking in the LA PT Panel.
 Blowering&Cleaning of NGR & NGT.
 Check the continuete of NGR Resistance.
 Check the rotor earth fault carbon brush condition.
 IPBD Hot Blower Motor Cleaning .
 Check WR/IR value of Hot Blower Motor.
 Hot Blower Panel cleaning and its heater condition checking.
 After work completed , close the PTW.

From………………………………………………………………….To………………………………………………………………………………..
Date……………………………….
ScheduledActivityforthe day: GENERATOR & EXCITATION SYSTEM

From………………………………………………To………………………………………………………………………………..
Date…………………………
GENERATOR & EXCITATION SYSTEM

RELAY PROTECTION SYSTEM OF GENERATOR AND MOTORS
Why protections are required for Generator and motors.
Type of protection relay with using CT and PT, classification of protection relay according to
place of use, Function of each protection relay in the field, what is group protection relay and
its model in HNPCL BHEL generator , Different types of relay used for motor protection,
Different parameter setting used in motor protection relay,
TYPES OF PROTECTION RELAY USING CT AND PT :
1. CT operated relay:
*Generator Differential relay (87G)
*Local breaker back up relay (LBB-51)
* Stator earth fault relay (51N)
*Negative phase sequence relay(46)
*Restricted earth fault relay(64).
2. Voltage operated relay:
*Under voltage relay (27)
*Over voltage relay (59)
* Under frequency relay (84U)
*Over frequency relay (81O)
*Over fluxing relay (24).
3. Both Voltage and current operated relay:
*Field failure relay(21)
* Reverse power relay (32)
* Low forward power relay (37)
* Pole slip relay (78)
TYPES OF MOTOR PROTECTION RELAY :
 Motor management rely.
 Spam150 relay(ABB)
 Micom P211(AREVA)

 MM30 relay(L&T)
 Bimetal thermal relay
Protection parameter setting for MOTOR:
 Over voltage setting.
 Under voltage setting
 Over current setting
 Earth fault setting.
 Instant earth fault setting
 Stalled rotor setting

From………………………………………………………………….To………………………………………………………………………………..
Date……………………………….
ScheduledActivityforthe day: RELAY PROTECTION SYSTEMOF GENERATOR ANDMOTORS

From………………………………………………To………………………………………………………………………………..
Date…………………………
RELAY PROTECTION SYSTEMOF GENERATOR AND MOTORS

INSTRUMENT TRANSFORMERS
CT and PT are calledinstrumenttransformer.
MeteringandProtectionpurposesCTandPT are used.
TESTING OF CT:
1) PolarityTest
2) Ratio Test
3) Knee pointTest
TESTING OF PT:
1) WR Testing.
2) IR Testing
3) PI Testing
SPECTION DETAILS OF CT:
CT Ratio- 20000/5, Core- 1 , Burden -75VA , Class -0.2
IL -24/55/125, HSV- 24KV, STC -132KA FOR 1Sec.
HZ-50HZ , Insulationclass-B
SPECIFICATIONDETAILS OF PT:
PT. Ratio- 21000/√3:110/√3, Frequency- 50HZ,Burden- 75VA,
Accuracy Class- 0.2PS , Insulationclass- B,Make-Paras.

From………………………………………………………………….To………………………………………………………………………………..
Date……………………………….
ScheduledActivityforthe day: INSTRUMENT TRANSFORMERS

From………………………………………………To………………………………………………………………………………..
Date…………………………
INSTRUMENT TRANSFORMERS

DG SET
Location,Rating,Purpose of DGSet,Differentpartsof DG Set,Preventive maintenance
checklistof DG Set.
SPECIFICATIONDETAILS OF DG SET:
Rating- 1500KVA, Volt- 415VAC/3PH/50HZ,
Load current– 2086.8Amp. , PF- 0.80,
Rpm- 1500, Windinginsulation- classH,Connection- y,
ExcitationVoltage-63,Excitationcurrent- 3.6Amp.
Make-StamfordJackson.
PARTS OF DG SET:
1) Rotor Winding
2) Stator Winding
3) Shaftand Bearing
4) Exciterrotor
5) Exciterstator
6) Terminal box
7) AVRand Rectifier
8) AirFilter
9) Radiatorwithwaterpump
10) Engine
11) lube-oil pump
12) SelfStarter
13) Smoke Exhauster
14) Batteryand batterycharger
15) Control panel
PREVENTIVE MAINTENANCECHECK LIST OF DG SET:
1) ObtainPTW and confirmthe isolationof outgoingBreaker.
2) Cleaningof DG Setwithblower/vacuumcleaner.
3) Tightnessof control panel wiring.
4) Cleaningandtightnesscheckingof powerTB.
5) Cleaningof battery,Checkingof batteryspecificgravityandbatterywaterlevel topup,if required.

6) Cleaningof lub,pumpandwaterpump
7) Checkradiator waterlevel,if requiredtopupit withcoolestwater.
8) Cleanair filter.
9) Checkengine oil level.
10) Cleaningandwiringtightnesscheckingof batterycharger.
11) Cleaningof generatorstatorandrotor windingbyairblower.
12) Close PTWafterwork completed.
13) Take trial run of DG Set.

From………………………………………………………………….To………………………………………………………………………………..
Date……………………………….
ScheduledActivityforthe day: DG SET

From………………………………………………To………………………………………………………………………………..
Date…………………………
ScheduledActivityforthe day
: DG SET
duration of the field
training of particular
equipment , summaries
your knowledge:

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