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(MA) Main Generation Flashcards

1
Q

Main purpose of the Main GENERATION system (MA)
Hint-4 answers

A

1.) Converts mechanical energy from the main turbine into electrical energy

2.) Supplies electrical energy to SRP 525kv switch yard and Grid

3.)Supplies electrical energy to Units House loads (Non class 13.8kv[NA] and non class 4.16kv[NB])

4.)Supplies electrical energy to Main Generator Excitation and Reg. System(MB)

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2
Q

What does the Main GENERATION system consist of??
hint-5 answers

A

•Main Generator
•Isophase Busses
•Main transformer bank
•Tie lines to SRP 525kv yard
•Unit Aux Transformer

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3
Q

What’s the purpose of the Main GENERATOR??
Hint-1 answer

A

•Concert mechanical power from the turbine into electrical power

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4
Q

Operation of Main GENERATOR?
Hint-7 answers

A

•Turbine driven
•4 pole (N,S,N,S)
•Synchronous
•AC machine

-PVGS uses rotating field AC Generator

-Uses DC current from Excitation and Reg. System passes to collector the to rotor field windings.
-That creates an electromagnetic field and cuts through Stator windings to generate 24kv output voltage.

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5
Q

What does the main GENERATOR consist of?
Hint-4 answers

A

•Generator Casing
•Stator
•Rotor
•Collector

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6
Q

Purpose of the Generator Casing.
Hint-what does it include and what does it contain

A

Includes:
•Stator Frame
•End shields
•Excitation Dome
•Lower frame extension

Actually Contains:
-Stator Windings
-Stator Core
-Rotor
-Hydrogen Gas Coolers

Welded and Gas tight

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7
Q

What does the Stator Frame support,enclose and provide??

A

Supports and encloses:
-Stator Windings
-Stator Core
-Rotor

Provides:
Multiple flow paths for directing the hydrogen gas through out the generator.

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8
Q

Describe End Shields

A

•Heavily reinforced circular fabrications
•Supports the weight of the rotor and contains Hydrogen gas
•Each end shield has an inner and outer shield

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9
Q

Describe Inner End Shield

A

•Separates gas discharged by the rotor fans from the gas entering the fans
•Supports rotor

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10
Q

Describe Outer End Shield

A

Contains and Supports:
•Generator rotor bearing
•Hydrogen Shaft seals
•Oil passages

Prevents:
-Escape of hydrogen along shaft by attached Shaft Seals which gets seal oil pumped through it

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11
Q

Describe Excitation Dome

A

•Mounted on top of the Stator Frame
•Contains the Generator Hydrogen distribution tubes and coolers

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12
Q

Describe Lower Frame Extension

A

•Power from generator exits through this via High Voltage Bushings
-Cooled by Stator Cooling Water(CE)

•Isolate the 24kv output from the Gen. Casing

•Connects Main generator to the Isophase buses

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13
Q

Describe the purpose of the Stator

A

•Generates voltage and current supplied to 3 main and 1 Aux transformer, via Isophase

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14
Q

Describe operation of Stator Core

A

•Composed of thousands of punchings

•Each punching contains slots for stator bars

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15
Q

Describe operation of Stator Windings

A

•Formed by insulated Stator Bars joined at the ends to form coils
•Then connected in proper phase belts by CONNECTION RINGS at the end of the winding

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16
Q

How does a 24kv voltage generate in stator windings and how does it exit it?

A

•By a rotating magnetic field cutting through them

•Exits by the High Voltage Bushing
High voltage bushing cooled by stator cooling water

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17
Q

How is the Stator Cooled??

A

•Cooled by Stator Cooling Water(CE) flowing through the hollow bars

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18
Q

Describe the purpose of the rotor

A

Produces the required magnetic flux to cut the armature windings and create voltage and current

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19
Q

Describe the operation of the Rotor

A

•Rotor is forged from forged alloy steel
•Slots contain the field windings
•Held in place by retaining rings and covered the length with a a drilled casing

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20
Q

Describe rotor field windings

A

•Designed to create 4 poles 90deg apart
•DC is applied to it to create a magnetic field
•Rotor is attached to the turbine which spins it so the magnetic field cuts through the Stator when rotated

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21
Q

How are the Rotor Field Windings cooled ?

A

•Cooled by hydrogen moved by fans attached to the rotor

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22
Q

How is the Hydrogen that cools the rotor cooled?

A

•It’s cooled by the generator hydrogen gas coolers
•Which is then cooled by Turbine cooling water(TC)

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23
Q

Describe the purpose of Collector and its Housing

A

•Collector applies DC to the rotor fields windings to induce the rotating magnetic field

•Collector Housing is cooled by a mounted fan which forces the air to a cooler which is cooled by normal chilled water

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24
Q

Where is the collector located?

A

•It’s located inside the generator collector housing, out board end of the generator.
•Cooled by a mounted fan, cooler and normal chilled water.

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25
Q

How does the collector apply DC to the rotor?

A

•By the use of slip rings and spring pressed carbon brushes

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26
Q

Purpose of Isolated Phase bus (Isophase busses)

A

•To conduct power from the main generator to the main transformers and unit aux transformer.

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27
Q

Operation of Isophase

A

•Isolated from each other and atmosphere
•Aluminum conductor supported by porcelain.
•Cooled by forced air from Isophase Duct Cooling(CE) to manage heat from I2R losses

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28
Q

Purpose of Main Transformers
(MANX01A,B,C)

A

Step up 24kv produced by the Generator to Transmission system voltage 525kv

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29
Q

Which side is connected to which on the Main transformers?

A

•Primary is directly connected to the main generator
•Secondary is connected to two main output breaker (9x5;9x8) via a MOD (910,930,980) and two manual operated disconnects (9x6;9x7)

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30
Q

How many bushings on the Main Transformer and what do they connect?

A

NOTE:
•Resin impregnated,oil free

High Voltage Bushing-Connect Secondary Windings to SRP switch yard

Neutral Bushing-Connected to ground to minimize ground faults

Low Voltage Bushing- Connects the 24kv from the generator to the primary winding

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31
Q

What’s the Bushing potential device?

A

•Powers space heater on Main XFMR from high voltage line via Condenser bushing to PBA-Cabinet

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32
Q

What monitors the Main Transformer temps and what does it monitor and control?

A

-The Electric Temperature Monitor (ETM)
-It monitors Winding temp and Top oil temp.

-It controls the operation of the cooling banks.

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33
Q

How is the Main Transformer Cooled?

A

•Cooled by forced air and forced oil
•Consist of:
-Fan banks
-Radiator cooling Core
-Oil pump

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34
Q

When does the Main Transformer phases Start?

A

Phase 1: Group 1 fans and pump starts when Generator is Flashed

Phase 2: Group 2 activated @70-75deg Celsius second bank of fans and second oil pump starts

Phase 3: Group 3 activates @ >75 deg. Celsius third bank of fans and 3rd oil pump starts

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35
Q

What does the Constant Oil Pressure System (COPS) consist of?

A

Consist of:
-Oil filled conservator tank
- Bladder connected to atmosphere
-Desiccant breather (silica gel)
-Oil trap to stop constant absorption of ambient air and dust particles
-A pressure indicator which should always be steady
-A float indicator/switch calibrated for 25deg Celsius *alrarms on HI or LO level.

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36
Q

How does the Constant Oil Pressure System(COPS) work?

A

As the temperature of the oil raises and lowers it expands and contracts pushing or sucking on the bladder that’s maintaining pressure close to atmospheric. Also monitors level with a float lever attached to a gauge.

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37
Q

How does the mechanical relief on transformers work?

A

•Spring closed lid, once over pressure opens a flag is lifted vertically and alarm is sent to control panel and Control room
•Flag and alarm must be reset manually

38
Q

How does Sudden Fault Pressure Monitor work?

A

•Has sensors throughout the transformer to monitor internal faults,
•Had 3 Chanels
•1 channel activated alarms
•2 consecutive channels trips transformer
•Yellow light indicates increase pressure
•Reset switch to reset
•Alarm kill switch to disable alarm

39
Q

How does the Gas Accumulation detector work?

A

•Gas from deteriorated insulation or burned oil floats to the top and moves a needle
•SHOULD read zero, any reading other than 0 is bad
•

40
Q

How does the Serveron Gas Analyzers Work?

A

•They monitor gas from internal faults
•Use helium to analyze
•Need website to determine actual Gas
•Lights
-Green-power
-Blue-service
-Red- alarm

41
Q

Main Transformer Control Cabinet
Front panel?

A

•Powered from 2 different 480LC supplies
•2 lights to indicate both power sources available
•Switches to control the Cooling banks and heaters
•An alarm panel
•Powers ETM,Sudden fault pressure monitor, serveron gas analyzer and PBA2 heater.

42
Q

Main Transformer control cabinet back panel

A

•Individual breakers for both 480LC inputs
•BREAKERS for each cooling bank
•Fuses
•Overload devices
•Has Automatic Bus Transfer(ABT)

43
Q

Describe Alarm panel on the Main Transformer Control Cabinet

A

•Has 12 alarms on it
•Testing it does not send alarm
•Units have a common alarm
•Powered from the 125vDC(NK) system

44
Q

Describe the Unit Aux transformer

A

•Steps down main generator voltage from 24kv to 13.8kv going to S01&02 for Unit house loads.
•1 primary winding and 2 secondary windings
•Isolated by generator trip and from NANS01 and NANS02 switch gear breakers.

45
Q

Describe Unit Aux Transformer bushings

A

•High voltage bushings connect incoming 24kv to the transformer
•Low voltage bushings connect to the outgoing 13.8kv lines

46
Q

What monitors the temp and controls the cooling banks on the UNIT AUX transformer? Which temps. does it monitor?

A

•The Electronic Temperature Monitor does.(ETM)
•It monitors winding temp and top oil temp.

47
Q

Does Unit Aux have a Constant Oil Pressure System(COPS)

A

Yes, yes it does.
*Consist of:
-Conservator tank
-oil trap
-desiccant breather
-bladder
-Float level indicating switch
-Pressure indicator(must be constant)

48
Q

Does the Unit Aux have mechanical relief and how many?

A

Yes, and only 1
consist of:
-spring loaded valve
-local alarm flag
-Local and control alarm

49
Q

Does the Unit Aux have a Sudden fault pressure monitor?

A

Yes, it does.
consist of:
-3 channels
-1 channel activated alarms
-2 consecutive channels alarm, XFMR trips
-local indicating lights

50
Q

Does Unit Aux have a Gas Accumulator?

A

Yes,it does
Consist of
-Displaces oil as gas accumulates and moves a needle on a gauge
-Anything other than 0CC is bad.

51
Q

Does the Unit Aux Transformer have a serveron Gas analyzer??

A

Yes, it does
Consist of
-Uses Helium to analyze
-Needs website to see gas
-Green (power light)
-Blue (Service light)
-Red ( Alarm light)

52
Q

Does Unit Aux transformer have a Control Cabinet?

A

Yes, It does.
-It houses the alarm panel and all the components to control the cooling banks

53
Q

Does the Unit Aux transformer have an alarm panel?

A

Yes it does
-powered from 125vDC(NK)
-12 alarms
-Units have a common alarm for all 12
-Testing the switches locally doesn’t alarm the Control room

54
Q

What do the output breakers do for the generator? And Who controls them?
*Breakers 9x5 and 9x8 l

A

-They provide protection and synchronization (Connecting and disconnecting of the grid)
-also provides isolation
•The control room controls them

55
Q

What does the Motor Operated Disconnect do for the Main generator? And Who operates it?

A

-Provides isolation of the Unit from the grid
Must NOT be operated under load
-Control room operates it
-AO can during an emergency

56
Q

What do the Manual operated disconnects provide for the Main Generator?

A

-They provide isolation for maintenance on the MOD or 9x5, 9x8 breaker

57
Q

Describe ‘Connecting the Main Generator to the Grid’

A

-“5” and “8” breaker open and MOD closed

-Breaker “8” closes to parallel the generator to the grid

-Breaker “5” is then closed.

58
Q

Describe ‘Disconnecting the Generator from the Grid’

A

1.) Reactor reduced to 20%
-Busses are transferred to NANS03&04

2.) Then reactor is tripped

3.) Then Main Generator will motor once residual turbine energy is dissipated

4.) Once the reverse power condition is sensed then the generator will trip.

5.) Which trips Generator excited and “5” and “8” breaker

59
Q

Describe Normal Operation of Main Generator System

A

1.) Pressurizing the Generator with Hydrogen

2.) Starting Stator Cooling system (CE) to cool stator and Isophase

3.)Bring turbine up to speed and apply excitation to Rotor field windings

4.) Then Main XFMR’s and Aux XMFR are energized with their associated cooling

5.) Generator is synced to the grid by “8” breaker until 65MW then “5” breaker is closed

6.) then S01 and S02 is powered from Aux XFMR

60
Q

What will happen to prevent a reactor trip during a load rejection?

A

•Reactor Power Cut Back(RPCB)
-Drops subgroups to reduce to 60%

•Steam Bypass Control System(SBCS)
-Bypasses Steam around the Main Turbine straight to the Main Condenser to control the cooling effect on the reactor

61
Q

What will cause a FAST BUS TRANSFER(FBT) and what’s the purpose?

A

• Loss of the Main Generator
OR
•Loss of the Unit Aux transformer
-purpose is to keep the RCP’s running

62
Q

How does Main generation excitation and regulation(MB) interface with (MA)?

A

•Ex2100e provides regulated DC to the Main Generator Rotor field windings
•MB provides trip signals to the MA system Main generator trip logic

63
Q

How does Non-class 13.8kv(NA) system interface with the (MA) system

A

•(MA) provides 13.8kv to the NA system during normal operation
•Has interlocks for a Coast down trip

64
Q

How does Non-Class 480v LC (NG) interface with the (MA) system?

A

•The Main XFMR cooling fans receive power from (NG)

65
Q

How does Non-class 480v MCC (NH) interface with (MA)?

A

•MA space heaters receive power from MCC via distribution panels
•Unit Aux transformer cooling fans power source

66
Q

How does the Non-class 125vDC control power (NK) interface with the (MA) system?

A
  • Provides control power to the Main and Aux transformers annuciator panels
  • provides control power for the Main Generation control cabinets in the SSR room
67
Q

How does the Non-class 120vAC Instrument Power(NN) interface with the (MA) system?

A

-NN provides power to the MA control cabinets in the SSR room

68
Q

How does the Uninterruptible power system (NQ) interface with the (MA) system?

A

-NQ provides power to MA control cabinets in the SSR room

69
Q

How does the Normal Lighting (QA) system interface with the (MA) system?

A

-QA supplies power to Main Generator Control cabinets in the SSR room

70
Q

How does the Off-site power(NO) system interface with the (MA) system?

A

-Loss of Offsite power activates interlocks with the Main Generator to initiate a “coast down trip”
-Also power coming in through the 13.8kv(NA) provide power signals to the MA system for billing metering

71
Q

How does the SRP 525kv Switchyard interface with the (MA) system?

A

•MA provides 525kv to the SRP SY
•MA has interlocks with the SRP 525kv SY
-Main Generator output breakers trip due to
•reactor trip
•main generator trip

72
Q

How does the Control Oil(CO) interface with the (MA) system?

A

A main generator trip causes the CO system to trip the main turbine stop,control and combined intermediate valves.

73
Q

How does the Stator Cooling (CE) system interface with the (MA) system ?

A

Provides cooling

Stator cooling water:
•Main generator stator winding
•Main Generator High Voltage Bushing

Isophase Bus Duct Cooling
•CE provides forced air for cooling the Isophase ducts

74
Q

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

A

•(GH) provides hydrogen to the Main Generator Casing, and maintains purity, to provide cooling to the main generator field windings

75
Q

How does the Lube Oil(LO) system interface with the (MA) system?

A

•(LO) provides lift, lube, and cooling to the Main Generator Bearings

76
Q

How does the Main Turbine (MT) system interface with the (MA) system?

A

•MT provides mechanical power to spin the Main Generator Rotor

77
Q

How does the Reactor Coolant(RC) system interface with the (MA) system?

A

•(MA) has interlocks with the (RC) system for tripping the Reactor Cooling Pumps during a “coast down trip” of the Main Generator

78
Q

How does the Seal Oil(SO) system interface with the (MA) system?

A

•SO prevents leakage of Hydrogen from the Main Generator casing to the Turbine Building atmosphere at the Main Generator shaft seals.

79
Q

How does the Turbine Cooling Water (TC) system interface with the (MA) system?

A

•TC cools the hydrogen in the main generator via the Main Generator Hydrogen Coolers in the Excitation dome

80
Q

How does the Control Element Drive Mechanism Control System(CEDMCS) interface with the (MA) system?

A

•CEDMCS has interlocks with the MA system to trip the Main Generator when the reactor trips

81
Q

How does the Site Building HVAC (HS) system interface with the (MA) system?

A

•HS provides cooling to the Subsynchronus Resonance (SSR) Room that houses Main Generation Control Cabinets via a dedicated Air handling Unit (AHU)

82
Q

What happens if you lose Non-class 125vDC control power (NK)?

A

•If a main turbine and reactor trip occurs with no 125vDC control power available then the Main generator Output breakers will NOT trip requiring manual actual by the RO to open the breakers

83
Q

What happens if you lose excitation and regulation (MB) system ?

A

•Failure of MB causes the Main Generator to trip

84
Q

What happens if you lose Stator Cooling Water(CE)?

A

The generator will automatically trip after 70secs.

85
Q

What happens if you lose Generator Hydrogen(GH)?

A

-The Main Generator load MAY have to be reduced if the hydrogen pressure drops to a certain setpoint.

86
Q

What happens if you lose the Lube Oil(LO) system?

A

•Loss of Lube Oil to the Main Generator will cause the Main generator and the Main turbine to trip.

87
Q

What happens if you lose the Main Turbine (MT)?

A

•If the Main Turbine trips the Main Generator also trips

88
Q

What happens if you lose Main Generator Seal Oil(SO)?

A

•A total loss of (SO) requires the generator to be unloaded and de pressurized

89
Q

What happens if you lose Turbine Cooling Water(TC)?

A

•A total loss of TC will cause the Main Generator to trip
-because it cools Gen. H2 coolers, Isophase bus duct cooling, stator cooling water coolers, and Main Generator/Main turbine lube oil.

90
Q

What are the cooling phases on the Unit Aux XFMR?

A

Phase 1:
-All natural circ when Top Oil <60C or Winding <70C

Phase 2:
-Natural oil but Forced air (all 14fans) when Toil >60C or Twinding >70C
7fans on 10sec delay then other 7 start

Phase 3:
-Forced air (All 14 fans) and forced oil (3pumps) when Toil>65C or Twinding>75C

Systems (8 decks)

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