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Flashcards in Station Power Alarms Deck (24):
1

What is EK-0325, "UNIT TRANSFORMERS TROUBLE"

Sensor:

  • 474 TXM (Main Transformer)
  • 274 TX (Station Power 1-1)
  • 174 TX (Station Power 1-2)

Trip Setpoints: Any annunciation at local panel on Main, Station Power 1-1, or Station Power 1-2 Transformers


Alternate Indication: None

EK-0325 does NOT have Reflash. Additional monitoring will be required when standing alarm conditions exist.

2

What is EK-0530, "START-UP TRANSFORMERS TROUBLE"

Sensor:

  • 474 TX-S1 or 474 TX-S2

Trip Setpoints: 

  • Any alarm on local alarm Panel: EK-X03 (Startup Transformer 1-1) or
  • EK-X04 (Startup Transformer 1-2)

Alternate Indication:

  • Red Trouble Light for Xfmr Start-up 1-1EX-03 or Xfmr Start-up 1-2 EX-04 (EC-04)

3

What is EK-0525, "START-UP TRANSFORMERS TRIP"

Sensor:

  • 486-11 (S/U XFMR 1-1) or 486-12 (S/U XFMR 1-2)

Trip Setpoints:

  • From Differential, Sudden Pressure, Overcurrent, or Ground relays

Alternate Indication:

  • Voltage indication for affected buses

AUTOMATIC FUNCTION:
 Affected Startup Transformer Incoming Breakers trip, if closed:
o Startup Transformer 1-1: 252-102 (Bus 1A), 252-302 (Bus 1F)
o Startup Transformer 1-2: 152-106 (Bus 1C), 152-202 (Bus 1D), 152-303 (Bus 1E)
 'R' Bus trips.

4

What is EK-0529, "START-UP TRANSFORMER PROT CKT UNDERVOLTAGE"

Sensor:

  • 474S

Trip Setpoints: 

  • Loss of Potential

Alternate Indication:

  • Loss of D11-1 indicated by auto start of Steam Driven Auxiliary Feedwater Pump P-8B

5

What is EK-3304, "STARTUP TRANSFORMER NO 1-3 TROUBLE"

Sensor: 474TX-S3
Trip Setpoints: Any alarm on local alarm panel EK-X091 on S/U XFMR 1-3
Alternate Indication: None

6

What is EK-3303, "STARTUP TRANSFORMER NO 1-3 TRIP"

Sensor: 486-13
Trip Setpoints: From Differential, Ground, Sudden Pressure, and Overcurrent relays
Alternate Indication: "R" Bus tripped

 Trips "R" Bus
 Trips breaker 252-202 4160V Bus 1B Startup Transformer 1-3 Incoming Breaker
 Trips breaker 252-402, S/U XFMR 1-3 to Bus 1G

7

What is EK-3301, "START-UP TRANS NO 1-3 PROT CKT UNDERVOLTAGE"

Sensor:

  • 474-S3

Trip Setpoints:

  • 52 VDC

Alternate Indication:

  • Bus 1A "Control Power Available" light on Panel C-04

8

What is EK-0326, "STA POWER TRANSFORMER 1-1 SUDDEN PRESS"

Sensor:

263X, Sudden Pressure Alarm Trip, Deluge Control (2 of 3 logic)
263X3, Sudden Pressure Alarm Deluge Control

Trip Setpoints: No specific setting

Alternate Indication: None

9

What is EK-0332, "STA POWER TRANSFORMER 1-2 SUDDEN PRESS"

Sensor: 163X Relay (2 of 3 logic)
Trip Setpoints: No specific setting
Alternate Indication: None

AUTOMATIC FUNCTION:
 Trips 386P, Generator Direct Trip Lockout Relay, which trips Generator Breakers 25F7 and 25H9.
 Initiates Transformer deluge.

10

What is 

  • EK-3339, "STA PWR TRANS NO 1-3 SUDDEN PRESSURE"

Sensor: 30/K4B
Trip Setpoints: No specific setting
Alternate Indication: None

AUTOMATIC FUNCTION:
 Trips 386P Lockout Relay, which trips Generator Breakers 25F7 and 25H9.
● Initiates Transformer Deluge.

11

What is 

  • EK-0331, "MAIN TRANSFORMER SUDDEN PRESS"

Sensor: 463X Relay (2 of 3 logic)
Trip Setpoints: No specific setting
Alternate Indication: None

AUTOMATIC FUNCTION:
 Trips 386P, Generator Direct Trip Lockout Relay, which trips Generator Breakers 25F7 and 25H9.
 Initiates Transformer deluge.

12

What is 

  • - EK-0526, EK-0527, "START-UP TRANSFORMER NO 1-1 (1-2) SUDDEN PRESS."

Sensor: 463X-11
Trip Setpoints: No specific setting
Alternate Indication: Voltage indication for affected bus & 'R' Bus trip indications

AUTOMATIC FUNCTION:
 Trips Lockout Relay 486-11, actuating EK-0525 "Startup Transformers Trip."
 Affected Startup Transformer Incoming Breakers trip, if closed:
o Startup Transformer 1-1: 252-102 (Bus 1A), 252-302 (Bus 1F)
 'R' Bus trips.
 Transformer Deluge initiated.

13

What is EK-3302, "STARTUP TRANSFORMER NO 1-3 SUDDEN PRESS"

Sensor: 463X-13
Trip Setpoints: No specific setting
Alternate Indication: None

AUTOMATIC FUNCTION:
 Trips 486-13 lockout relay, actuating Annunciator # 3.
 Initiates Transformer deluge.

14

What is EK-0329, "PILOT WIRE TROUBLE"

Sensor: PM 13-1 Relay
Trip Setpoints: Loss or Failure of DC Monitoring Current 
Alternate Indication: None

 

15

What is EK-0330, "SWYD PWR PLT INTERPOSING CONTROL CKT UNDERVOLTAGE"

Sensor:

  • 474-1, Interposing Control 25F7
  • 474-2, Interposing Control 25H9
  • 474-3, Control Circuit Undervoltage

Trip Setpoints: Loss of DC Voltage

Alternate Indication: None

16

What is EK-0336, "SWITCHYARD ACB TRIP"

Sensor: Contact
Trip Setpoints: Annunciation at Switchyard Panel C-53
(Annunciator # 40, 48, 56, 64, 72, 80, 88, 92, 96)
Alternate Indication: Quindar Panel Indications

17

What is EK-0522, "BUS FAIL TO TRANSFER"

Sensor:

  • 252-102/b & 383-21 (Bus 1A),
  • 252-202/b & 383-22 (Bus 1B),
  • G1-1/DSR & 152-106/b & 383-11A (Bus 1C),
  • G1-2/DSR & 152-202/b & 383-12A (Bus 1D),
  • 152-303/b & 383-11 (Bus 1E),
  • 252-302/b & 383-23 (Bus 1F), or
  • 252-402/b & 383-23 (Bus 1G)

Trip Setpoints:

  • Transfer relay energized with Startup Transformer Incoming Breaker OPEN for longer than assigned transfer time. (0.2 sec to 1.5 sec after Station Power Incoming Breaker trips)

Alternate Indication:

  • Bus voltage for individual buses at Panels EC-04 and EC-106

18

What is 

  • - EK-0523, "BUS TRANSFER CONTROL CKT UNDERVOLTAGE"

Sensor: 274-11 or 274-12
Trip Setpoints: Loss of Potential
Alternate Indication: None

OPERATOR ACTION:
 CHECK Bus 1A "Control Power Available" light illuminated on Panel EC-04.
 CHECK Bus 1B "Control Power Available" light illuminated on Panel EC-04.

19

What is EK-0524, "LOAD SHEDDING/SAFEGUARDS BUS CONTROL CKT UNDERVOLTAGE"

Sensor:

174-A11/308, 174-A12/403, 174-A11/307, 174-A12/402, 174-1, 174-402, or 174-401
Trip Setpoints: Loss of Potential
Alternate Indication: None

NOTE: Alarm is expected if the control power fuses are removed from either 152-105, Station Power Trans 1-2 Breaker, or 152-203, Station Power Trans 1-2 Breaker.


OPERATOR ACTION:
 CHECK Bus 1C "Control Power Available" lights illuminated on Panel EC-04.
 CHECK Bus 1D "Control Power Available" lights illuminated on Panel EC-04.

20

What is - EK-0528, "PZR HTR XFMR 15 OR 16 HI TEMP OR UNDERVOLTAGE"

Sensor: ET1S-1305 or ET1S-1211
Trip Setpoints: 200C or Loss of Potential
Alternate Indication: Prz heater light indications (EC-02)

NOTE: Pressurizer heater transformers do not have cooling fans.

21

What is EK-0501, EK-0502, "4160V BUS 1A (1B) BKR 252-101 (252-201) TRIP"

Sensor:

  • 252-101/b and 252-102/b

Trip Setpoints: 

  • Breaker OPEN with control switch in AFTER CLOSE position AND Startup Breaker, 252-102 OPEN

Alternate Indication: 

  • Bus 1A VOLTS/AMPS (EC-04)

OPERATOR ACTION:
 DETERMINE cause of failure for bus to Fast Transfer.
 IF reasonable assurance exists that there is no fault on Bus 1A AND Startup Power is available, THEN
ENERGIZE Bus 1A from Startup Power per SOP-30.

22

What is EK-0507, EK-0508, "4160V BUS 1A (1B) BKR 252-102 (252-202) TRIP"

Sensor: 252-102/b and 252-101/b
Trip Setpoints: Breaker OPEN with control switch in AFTER CLOSE position AND Station Power Breaker, 252-101 OPEN
Alternate Indication: Bus 1A VOLTS/AMPS (EC-04)

23

What is 

  • EK-0513, "4160V BUS 1A AND/OR 1B UNDERVOLTAGE"

Sensor:

  • 227X-1 or 227X-2

Trip Setpoints: 

  • 105V Secondary Relay or 3675V Primary Relay

Alternate Indication: 

  • Bus 1A VOLTS/AMPS (EC-04)
  • Bus 1B VOLTS/AMPS (EC-04)

24

What is EK-0519, "4160V STANDBY POWER NOT AVAILABLE"

Sensor:

  • 227X-5 (Bus 1A) or 227X-6 (Bus 1B)

Trip Setpoints:

  • 90V Secondary or 3150V Primary

Alternate Indication:

  • 227X-5 (S/U 1-1) or 227X-6 (S/U1-3) Lockout Relay tripped (EC-04)

AUTOMATIC FUNCTION:
 Bus 1A and/or Bus 1B Startup Power Incoming Breaker(s) 252-102 and/or 252-202 trip, if closed, and cannot be reclosed.
 Turbine Generator Coastdown Circuit is activated for affected bus.