Substation battery nominal voltage
Substation battery nominal voltage
(OP)
I'm installing a new battery next week in our main substation, and wanted some advice. Load will be 12 GE magneblast breakers. Nominal voltage is 125, closing coil is 90-130 95A and the trip coilis 70-140 6A. The system I'm replacing consisted of 54 cells but looking at the PO 60 were purchased. These batteries have been in service for along time and have started failing. I have a new battery consisting of 60 cells that I intend to install and float at 132-135. All of our relays are electro-mechanical, and the only thing the batteries will supply will be the indicator lights, breakers, and lifting/lowering mechanism. I don't feel that the extra 5V on float will cause any problems, and the voltage drop will probably cancel it. Is this a common concern? I've have read that some people leave out a cell over voltage concerns, but I'm not sure if this applies in this case. I can't find any information or drawings on the original system, other 125 VDC Bus on the swgr scematics.






RE: Substation battery nominal voltage
125 volt banks are commonly 60 lead-acid cells and normally run at the voltages you describe. Consult the battery manufacturer literature for actual float and equalize voltages, but your numbers are in the ballpark.
old field guy
RE: Substation battery nominal voltage
RE: Substation battery nominal voltage
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If we learn from our mistakes I'm getting a great education!
RE: Substation battery nominal voltage
RE: Substation battery nominal voltage
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If we learn from our mistakes I'm getting a great education!
RE: Substation battery nominal voltage
More cells will give you more run time for a given ampacity to the minimum 70 V. We use 60 cells, which puts the lower end of the manufacturer's suggested equalization voltage right at 140.
RE: Substation battery nominal voltage
RE: Substation battery nominal voltage
RE: Substation battery nominal voltage