Station Power Alarms Flashcards
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.
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)
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.
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
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
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
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
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
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.
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.
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.
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.
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.
What is EK-0329, “PILOT WIRE TROUBLE”
Sensor: PM 13-1 Relay
Trip Setpoints: Loss or Failure of DC Monitoring Current
Alternate Indication: None
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
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
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
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.
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.
What is - EK-0528, “PZR HTR XFMR 15 OR 16 HI TEMP OR UNDERVOLTAGE”
Sensor: ET1S-1305 or ET1S-1211
Trip Setpoints: 200C or Loss of Potential
Alternate Indication: Prz heater light indications (EC-02)
NOTE: Pressurizer heater transformers do not have cooling fans.
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.
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)
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)
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.
