L11 - DC Flashcards
What are the charger feeds for the following DC busses? 11DD 11DE 11DG 21DG 11DK 11DL 11DF 11DH 11DJ
11DD - 15 11DE - 16 11DG - 18 21DG - 28 11DK - 15 11DL - 16 11DF - K and L in series 11DH - 15P 11DJ - 16P
How long will div 1 and 2 batteries last during power outage and what voltage must it maintain?
How long does it take to charge them?
4 hours, 2.13 volts per cell
12 hours to charge them
If one charger is INOP what should be done in one hour?
what if that action can’t be met?
verify battery cell parameters are met
Declare battery INOP
what are the batteries associated with the following busses? 1901 1902 1903 1904 1905 2901 2902
1901 - E 1902 - E 1903 - D 1904 - E 1905 - D 2901 - D 2902 - D
What is the battery charger normally in service for Div 3?
C4
How long will Div 3 batteries last?
how long does it take to charge them?
2 hours
8 hours to charge
On battery chargers, what order do you close the breakers when you put them in service?
DC before AC
How many DC busses are required in modes 1,2,3?
Div 1,2,3
If AC supply is out of service to battery charger, what else should be done? Why?
Open associated charger output breaker to prevent battery from discharging
What temp should battery rooms be maintained at?
What happens if it’s not maintained?
should be maintained >62 deg F
<60 deg F, INOP battery
What should always be operable in the battery room?
Hydrogen detectors
At what percent hydrogen should chargers be taken to equalize?
50%
What's the power supplies to the following battery chargers? 1A4 1A5 1B4 1B5
1A4 - 15BA6
1A5 - 15BA3
1B4 - 16BB6
1B5 - 16BB3
What is the power supply to 1C4 and 1C5 battery chargers?
1C4 - 17B01
1C5 - 13B11
1C4 battery charger output breaker trips open due to internal breaker fault, voltage on 11DC drops by how many volts?
5-10 volts
