1. Assignment. 2
Power House Field Assignment
Q1. How many units are there inTarbela Power Station?
Ans.In Terbellapowerplant,There are total 14 Units that produceselectricity.
Q2. How much is the total generationof TPS?
Ans.In Terbellapowerplant,the total generationis3478MW . 1 to10 unitsare at 175MW and11 to
14 are 432MW .
Q3. Whichtype of Turbines are usedin TPS?
Ans. “Frances turbines”are usedinTerbellaPowerPlant.
Q4. How much is the diameterof penstockand MIV?
Ans. The diameterof panstockis24.5 inchesandThe diameterof MIV is 48.5 inches.
Q5. How much is the penstockpressure?
Ans. The pressure of penstockis150 bar.
Q6. What isthe pressure of water in Coolingwater System?
Ans. The pressure of waterincoolingsystemis10 bar.
Q7. What isthe pressure of oil in Lub. Oil System?
Ans.
Total Volume = 595 CF
Oil Volume = 215 CF
Air Volume = 380 CF
Max. Pressure= 400 Psi At(20 to 650 degree F)
Nor. Pressure= 350 Psi
Test Pressure= 600 Psi
Shell Thickness=1.18”
Q8. What isthe Governorsystem?
Ans Inlubricantsystem,we have abig compressoranda oil tank inthe hydrolicsystem70% of of
air and 30% of gas are mixedtogetherandusedto control the gatesopenand close .
Q9. Whichtype of Governorhas beenusedin TPS?
Ans.HydrolicType of governingsystemare usedinterbellapowerplant.
Q10. Whichtype of motors have beenusedwith the Governorsystem?
2. Ans. The governingsystemiscomposedof varietyof electrical andhydroliccomponents.The motors
used here are
1. Servo’smotors.
2. Ac Motor.
3. Dc Motor.
4. Servo’sAmplifiers.
5. Safetyvalvesoperate hydrayically.
PROTECTION SECTION
Q11.Generator protection
Ans
Generatorprotectionpanel(GPR) Thispanel hasfollowingfunctions: -
Generatorprotectionbydual digital protectionrelays - TransducersforGeneratormaincircuit
monitoringConstruction:
a) Powersupply: Forprotectionrelays:BothAC230V, 50Hz, 1-ph(UPS) andDC220V For
transducers:AC230V, 50Hz, 1-ph(UPS).
b) For relaycircuit:DC220V (distributedpanelinside)Forothers:AC230V,50hz.
Q12. Transformer Protection
Ans
Minimize the time of disconnectionfor faultswithinthe transformer.
To reduce the riskof catastrophicfailure tosimplifyeventualrepair.
Anyextendedoperationof the transformerunderabnormal conditionsuchasfaultsor
overloadscompromisesthe lifeof the transformer,whichmeans adequate protection
shouldbe providedforquickerisolationof the transformerundersuchconditions.
over-excitation protection
temperature-based protection
Protectionfor transformer
Buchholz Relay
Earth Fault Relay
Over current relay
Differential relay
Digital relay
Q13. Bus Bar Protection
Ans
ABB's busbar protection is designed for phase-segregated short-circuit
protection, control, and supervision of single busbars.
The busbar protection relay is intended for use in high-impedance-based
applications within utility substations and industrial power systems
3. The relay can also be utilized in restricted earth-fault and residual earth-
fault applications for the protection of generators, motors, transformers
and reactors.
Q14. Line protectionof powerhouses
Ans. Non- Unit protection:-
1. Time graded overcurrentprotection.
2. Currentgradedovercurrent protection.
3. Distance Protection.
Unittype protection
1. Differential Protection.
2. CarrierCurrentProtection.
