Battery Flashcards
(30 cards)
Batteries connected in series increase what?
Voltage
Batteries connected in parallel increase what?
Current
Batteries store and supply DC for use in what substation applications.
Relaying, S/C, breaker trip and close coils
In APS medium and large substations, the typical DC tripping voltage is based on……
125 VDC system
In APS medium and large substations, the typical DC S/C voltage is based on…..
24 VDC system
Battery voltage monitors and alarm for what conditions?
low tripping battery voltage, positive/negative grounds, high tripping battery voltage
Where would you expect to find the battery voltage monitor in the substation?
on a panel near the station annunciator
Where would you expect to find the battery charger and DC control panel in a substation?
In a separate room referred to as the battery room
Explain how a battery charger works?
It takes the incoming AC source and converts it to DC to charge the batteries. The charge rate can set to slow trickle (normal charge) or quick charge.
Explain the term “float”?
slow trickle charge rate used to maintain battery voltage level
Explain the term “equalize”?
Fast or quick charge rate to increase or boost voltage level.
Explain the term “charging amps”?
the electrical DC current supplied by the charger to charge the battery
Smaller substations on the APS system use a tripping battery voltage of….
125 VDC or 48 VDC
Why is it important to keep substation batteries well maintained?
Batteries provide DC stored energy critical to substation relaying and control. DC power is used to maintain substation reliability by supplying uninterrupted power to relays for clearing faults and to breaker trip/close coils for breaker open/close operations
Who would you notify for battery problems/maintenance?
Substation maintenance Dept battery crew
Who would you notify for other substation DC problems not directly related to batteries?
Substation maintenance Dept P&C group
Batteries require a controlled environment to operate efficiently and safely. What are some environmental considerations?
too cold, too hot, too little ventilation, too dirty, too close to sparks or fire, indirect sunlight and flammable storage
Where do battery chargers get their AC supply voltage?
from the substation station power transformer
What would happen if the AC supply to substation batteries was lost for an extended period of time
There would be no AC supply to the battery charge so the batteries could not re-charge. the batteries voltage would decay over time under DC load until the DC voltage would be too low to reliably operate the equipment.
What is the EMS display called that monitors battery voltage and from what directory can it be found?
Station battery voltage display, found from the Transmission Directory
How might a “control cubicle high temp” alarm affect station batteries?
Batteries are rated at 77 F. Higher temps can cause loss of some battery capacity and battery life.
Explain what a DS6Z1 125V DC alarm is?
DS=Desert Springs… 6Z1 = the alarm window ID at the substation annunciator. 125V DC = the battery monitor is in alarm
Substations are equip. with positive and negative ground lights. at what brilliancy, compared to each other, are they normally lit?
compared to each other that would normally be at equal intensity and dimly lit
How would you interpret a dim positive ground light with a brilliant negative ground light?
the substation has a strong ground on the negative leg
