Oral Prep Elec PWR Flashcards
What does the DC GEN 1/2 Fault light indicate?
Fault LT extinguish above 61.5% NH if operating Normal
.>61.5% NH, gen not functioning properly / triggered by GCU
Auto reset by GCU if underspeed situation
EXT PWR PB
What does the AVAIL light indicate?
Proper
Voltage / Current / Polarity
DC SVC/UTLY BUS
SHED light
One of the DV SVCE / UTLY 1 and 2 busses is shed
DC SVC/UTLY BUS
OFF light
All the DC SVCE BUS/ UTLY 1 AND 2 BUSSES ARE SHED
BTC GAURDED SWITCH
GREEN FLOW BAR?
BPCU CONTROLS BTC OPERATION/ESTABLISHES PRIORITY
EXT PWR, HOTEL MODE, OR SINGLE GEN OPS
(BTC IS CLOSED)
BTC GAURDED SWITCH
ISOL (BLUE)
BTC OPENED (PRESS IN)
BTR (BUS TIE RELAY) LOCKED OPEN (tie between ac busses)
What type of batteries are used?
24v Nicad Battery
How many batteries do we have?
2
MAIN
EMERGENCY
WHAT ARE THE AMPS TO THE BATTERIES?
MAIN? EMERGENCY?
MAIN 43 AMPS
EMERGENCY 17 AMPS
WHAT CAUSES BATT CHARGE FAULT?
THERMAL RUNAWAY
BUS VOLTAGE <25V
BAT SWITCH IN OVRD
START SEQUENCE
WHAT HAPPENS WHEN BAT SWITCH IS IN ON POSITION?
STANDBY BUSES SUPPLIED BY HOT MAIN BATTERY BUS
IF GPU CONNECTED/GEN 1/2 ONLINE, THEN DC STDBY BUS IS SUPPLIED BY THE HOT EMER BUS AND AC STDBY BUS IS SUPPLIED BY DC BUS 1
WHAT HAPPENS WHEN BAT SWITCH IS IN OFF POSTION?
ESS BUS, DC STBY BUS AND INV1 ARE ISOLATED FROM HOT MAIN BATT BUS
DC EMER BUS IS ISOLATED FROM HOT EMER BAT BUS
WHAT HAPPENS WHEN BAT SWITCH IS IN OVERRIDE?
ENSURES BASIC MODE OPERATION BY OVERRIDING ALL OTHER PROTECTIONS
WHAT IS DIFFERENCE BETWEEN
BASIC MODE?
EXT PWR?
GEN MODE?
BASIC - BATT SWITCH ON AND NO OTHER SOURCES OF PWR CONNECTED
EXT PWR - BPCU PRIOTITIZES GPU OVER OTHER SOURCES OF POWER
GEN MODE - BOTH GENS RUNNING NORMALLY
WHAT DOES UND/V LIGHT MEAN?
DC STBY BUS VOLT <19.5V
