Battery Earthing
Battery Earthing
(OP)
What are the advantages & disadvantages of solidly earthing one pole of a 48VDC substation battery? I have a system that i'd like to tie the positive to the substation earth mat, is this a good or bad idea?






RE: Battery Earthing
The other options are battery biased, and battery centre point earthing, normally used for 110V batteries. The centre point earthing method is predominant in new installations and allows the detection of earth faults on either pole upto about 50k Ohm resistance.
Regards
Marmite
RE: Battery Earthing
RE: Battery Earthing
Regards
Marmite
RE: Battery Earthing
You might want to review this report from the IEEE Power Systems Relaying Committee... www.pes-psrc.org/k/rlytrckt.zip
RE: Battery Earthing
Im agree with David, and with Marmite too.
110/125V DC and 220V DC is always ungrounded, but 48V DC in substations for telecommes, + is grounded and it is separated bank.
If you would like use 48V DC for the "small" SS, usually it is MV SS, you can use ungrounded system.
Of course in ungrounded systems you must use ground detector fault. See systems like to Bender, Startco.
Best Regards.
Slava
RE: Battery Earthing
RE: Battery Earthing
Only automobile battery systems come with negative grounding. I will be surprised if you are talking of negative pole grounding for a substation or telecom battery.
Would like to hear more details from you.