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Systems > Main Generation > Flashcards

Main Generation Flashcards

1
Q

How does Main Generator system produce power & where does it go when it does produce ?

A

.Mechanical power to electrical power
.provide power to switchyard
.provide power to non-class systems
.provide power to excitation system(DC voltage induced to rotor)

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2
Q

What is the sequence of components in Main Generating system include ?

A

.Main Generator
.Isolated phase busses
.Main transformer bank (24kv->525kv)
.Tie Lines to switchyard
.Unit Aux. Transformer(24kv->13.8kv)

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3
Q

Major components of Main Generator ?

A

.Generator casing
.Stator
.Rotor
.Collector

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4
Q

What is included in the Generating casing?

A

.Stator Frame
.End Shields
.Excitation Dome
.Lower Frame Extension

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5
Q

What is inside the Stator frame & what does it do for cooling ?

A

.Stator Windings
.Stator Core
.Rotor
.Provides multiple paths for cooling Hydrogen Gas

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6
Q

What do End Shields do?

A

Used to support weight of rotor and contain Hydrogen gas inside the casing by using shaft seals

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7
Q

Where is the Excitation Dome ? And what does it contain?

A

Mounted on stator frame, containing Hydrogen Tubes and Coolers

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8
Q

How does power exit the generator casing?

A

Through the high voltage bushings mounted in the lower frame extension.

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9
Q

What cools High Voltage bushings in Lower Frame Extension ?

A

Stator Cooling Water (CE)

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10
Q

What is purpose of Stator ?

A

Generate voltage and current supply to main transformer & Unit Aux. Transformer (via isophase bus)

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11
Q

What is the Stator Core?

A

Contains insulated slots for armature bars to go through

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12
Q

What is the stator made of?

A

3 separate insulated copper bars wrapped in a ring through a laminated core.

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13
Q

What cools the stator windings?

A

Stator Cooling Water (CE)

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14
Q

What is the purpose of rotor ??

A

Produces magnetic flux to cut armature windings, creating voltage & current

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15
Q

How does the rotor operate ?

A

Windings are held together by retaining rings & DC voltage is induced to create magnetic field

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16
Q

What cools Field Windings on Rotor ?

A

Hydrogen gas flowing over bars through casing by fans installed on each end of generator

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17
Q

What is purpose of the Collector?

A

Applies DC voltage to rotor inducing rotating magnetic field

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18
Q

How is DC power induced into rotor ?

A

By slip rings & carbon brushes, through collectors carbon brushes to rotor slip rings

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19
Q

How is the Collector cooled ?

A

By mounted fan circulating air in Collector housing & through cooler with Normal chilled water

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20
Q

What’re isophase buses used for ?

A

Conducts power from Main Generator to Main Transformer & Aux. Transformer

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21
Q

How do isophase busses operate ?

A

The 3 phases from generator are isolated from each other. Insulated conductor in water/dust tight enclosure

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22
Q

What cools the Isophase busses ?

A

Forced air from Isophase Bus Duct Cooling System (CE)

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23
Q

How many bushings are there & what’re they called on Main Transformer?

A

High voltage bushing->switch yard (525kv)
Low Voltage Bushing->primary windings (24kv)
Neutral Bushing ->grounded

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24
Q

What’re the primary and secondary windings for in main transformer?

A

.Primary is 24kv from generator
.Secondary is 525kv out transformer to the switchyard

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25
Q

What cools the air,THAT cools the Isophase busses ?

A

Turbine cooling water

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26
Q

What does main transformer bank consist?

A

Three Oil Filled, Single phase Transformers

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27
Q

What are manually operated disconnects for ?

A

For isolation of the Motor Operated Disconnect for maintenance

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28
Q

Where are the primary windings connected to on main transformer ?

A

Directly connects Main Transformer to Main Generator (via Isophase bus)

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29
Q

What’re the breakers used for on the output breakers in the SRP switchyard ?

A

For synchronization to the grid and protection of equipment

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30
Q

What is the Constant Oil Pressure System do for the transformers ?

A

Maintains atmospheric pressure on oil and seals it from atmosphere

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31
Q

What is the Dehydrating Breather for & how do you know when to change it ?

A

Uses silica gel to remove moisture from air going into bladder & turns from orange to green when ready to be changed

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32
Q

How does Liquid Level Detector work?

A

Factory calibrated at 25C=77F , gauge will adjust when temp. fluctuates. High & Low levels will alarm control room

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33
Q

What does a Mechanical Pressure relief device do?

A

Spring loaded valve that relieves pressure when it gets to high in COPS reservoir

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34
Q

How do you know if Mechanical Pressure relief device popped open ?

A

Yellow or red flag up or oil is around transformer

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35
Q

What does the Electronic Temperature Monitor do for the transformers?

A

Monitors winding temps. & controls operation of cooling fan banks

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36
Q

How and when, will the Sudden Fault Pressure Monitor trip the Main Transformer ?

A

It will trip when 2/3 of the sensors sense a pressure surge

37
Q

What is in the control panel for on the Main Transformer ?

A

Alarm annunciators, switches for cooling banks and cabinet heaters

38
Q

What does the Motor Operated Disconnect Switch allow ?

A

Allows Main Generator to be isolated from grid for maintenance ; allows for generators breakers to be closed and still keep generator offline

39
Q

What do the Main Generator breakers provide?

A

Ability to synchronize, connect, and disconnect power from grid ;Uses electrical protection trips for faults for Main Generator or power grid

40
Q

Where are motor operated disconnects operated from?

A

Usually control room, but may be operated locally

41
Q

Where are Main Generators breakers operated from ?

A

Control room

42
Q

When disconnect Generator from Grid what must be done prior ?

A

.Reactor reduced to 20% power
.transfer power from S01&S02
—>S03&S04
.reactor & turbine trip which causes a reverse power,which trips 525kv breakers

43
Q

Where is motor operated disconnect located ?

A

SRP switchyard

44
Q

What maintained pressure of oil in Unit Aux. Transformer & how many windings does it have ?

A

A nitrogen blanket prevents oxygen and air and it’s maintained by nitrogen cylinder; one primary winding of 24kv, two secondary windings of 13.8kv

45
Q

What kind of bushings are used on Unit Aux. Transformer ?

A

Two oil filled neutral bushings for grounding

46
Q

Where are isolation points for the Unit Aux. Transformer ?

A

Primary windings directly connected to transformer; secondary windings connected to S01& S02 buses

47
Q

What’re two phases of cooling for Unit Aux. Transformer ?

A

Setpoint is 70C , NO oil pumps

Phase 1:Natural Circ. Of oil
Natural Circ. Of air

Phase 2: Natural Circ.of oil
Forced air with all fans running

48
Q

Describe sequence events for main generator sequence startup ?

A

Bring turbine up to speed,flash field by applying voltage to rotor, energizes main transformer first stage cooling fans and oil pumps

49
Q

Describe what would happen on a loss of Main Generation system ?

A

Load rejection , fast bus transfer will happen if Main Generator trips

50
Q

How does Excitation system (MB) interface with MA system ?

A

Provides DC voltage to the rotor for field excitation & provides trip signals to Generator trip logic

51
Q

How does 13.8kv(NA) system interface with Generator system (MA)?

A

MA system provides power to NA system & NA system provides interlocks for MA system for “coast down trip”

52
Q

What does 480vac (NG) system interface with MA system ?

A

NG system provides power to cooling fans of Main Transformer

53
Q

Where do space heaters for MA system receive there operating power from ?

A

480 Non class-MCC via 120vac distribution panel

54
Q

How does control power (NK) interface with MA system ?

A

Control power(NK) goes to main transformer and Unit Aux. Transformer Annunciator panel & control cabinets

55
Q

How does Generator Hydrogen (GH) interface with MA system ?

A

System provides hydrogen to generator casing for cooling of rotor windings and maintains its purity

56
Q

How does Lube Oil system interface with Generation system (MA)?

A

Provides lubrication/lift to rotor bearings & sends vibration signals to MA system

57
Q

How does Main turbine interface with Main Generator (MA)system ?

A

.provides mechanical power to generator rotor
.send valve position signals to generator trip logic
.generator system sends signals to turbine grip logic

58
Q

How does reactor coolant(RC) system interface with Generation system (MA) ?

A

MA system provides interlocks to RC system for RCP trip logic during “coast down trip “

59
Q

How does 120VAC (NN) interface with MA system ?

A

NN provides instrument power to MA system control cabinets

60
Q

How does OffSite power (NO) interface with MA system ?

A

Provides contact interlocks to MA system generator protection “coast down “ logic & offsite power of NA system provides power signals to MA system for billing metering

61
Q

How does uninterruptible power (NQ) interface with MA system ?

A

Main generator TVMS cabinet & digital fault recorder receive power from NQ system

62
Q

How does normal lighting(QA) interface with MA system ?

A

Sub synchronous resonance relay cabinets, receive operating power from plant QA system

63
Q

How does In plant communications (QF) interface with MA system ?

A

Provides communication link between recorder data acquisition unit of each unit the master station and satellite synchronized clock

64
Q

How does SRP 525kv switchyard interface with MA system ?

A

Ma system provides power to switchyard & contact interlocks to 525kv switchyard (reactor trip & generator trip )

65
Q

How does Turbine Cooling water interface with MA system ?

A

TC cools hydrogen in main generator via hydrogen coolers in excitation dome

66
Q

How does HVAC(HS) system interface with MA system ?

A

Provides cooling to sun synchronous resonance room that houses Main Generation control cabinets via Air Handling Unit

67
Q

How will MA system respond to a loss of NK system ?

A

If reactor or turbine trip the MA output breakers will not trip and will need to be opened manually by control room

68
Q

How will MA system react on loss of MB system ?

A

Main Generator will trip due to loss of excitation in rotor

69
Q

How will MA system react on loss of stator cooling and Isophase bus duct cooling ?

A

Loss of stator cooling will trip generator
.Loss of bus duct cooling will force generator loading to be reduced due to high current

70
Q

How will loss of Generator Hydrogen affect MA system ?

A

Will cause Main Generator load to be reduced.

71
Q

How does a drop test work for Generator Hydrogen ?

A

See how much hydrogen pressure drops in 24 hour period

72
Q

How will MA system react on loss of Lube oil system ?

A

Turbine trip, which will trip main Generator

73
Q

How will MA system react on Turbine trip ?

A

Main generator trip

74
Q

How will MA system be affected in loss of seal oil system ?

A

Requires the Generator to be unloaded and depressurized

75
Q

How will MA system be affected on loss of Turbine Cooling Water (TC) ?

A

.Result in load reduction, possible Generator trip
.TC cools hydrogen coolers, isophase bus duct coolers, stator cooling water, lube oil system

76
Q

What does excitation and regulation(MB) system do for MA system ?

A

It supplies excitation power to generator & controls output voltage from startup to rated power; regulates voltage at generator terminals at a setpoint based on requirements of grid or control room

77
Q

How does main generator initially provided magnetic field rotation to rotor for startup ?

A

From a non class MCC

78
Q

What’re the major equipment of excitation system ?

A

.power potential transformers
.Power conversion room (PCR)
.MARK Vle Balance of plant control system
.hvac& fire protection

79
Q

What’re the power potential transformers for ?

A

Transforms 24kv from generator to 1050VAC for us by excitation system

80
Q

What cools power potential transformers ?

A

Natural oil circulation and natural air circulation by the fins

81
Q

What does Mark Vle Balance of Plant Control Module do ?

A

Monitor and controls all parameters of main generator field excitation

82
Q

What happens if power is lost to main fan for the power bridge cooling fans ?

A

A automatic bus transfer will take place and take power to the second fan

83
Q

What rooms are in the power conversion room ?

A

Control room , power room , air conditioning room

84
Q

What will happen if you use radio in PCR room while cabinet is open ?

A

Interfere with components by radio frequency

85
Q

What’re the two fire protection systems they’re used in PCR ?

A

VESDA fire detection-sends trouble alarm to control room
STAT-X fire suppression- PCR has canisters for suppression & must be dispersed manually by operator or fire department

86
Q

What does power room contain ?

A

Excitation and regulation equipment, bridge rectifiers, cooling fans, AC cabinet from secondary windings of power potential transformer(1050VAC, DC cabinet out to rotor field windings

87
Q

What does the air conditioning room in PCR house ?

A

HVAC units, current potential transformers, distribution panel

88
Q

How do PCR HVAC fans operate normally ?

A

One hvac unit is running with two back ups, units alternate operating time

89
Q

What do the high voltage bushing connect to, to transmit the electricity to the main transformers, auxiliary transformers, and excitation and regulation system

A

They connect by the isophase buses

Systems (62 decks)

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