battery protection
battery protection
(OP)
what would be the best protection device to be used between battery and charger?MCB or Fuse ?
thanx
thanx
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RE: battery protection
The right type of fuse will have greater fault protection capability than a C/B. However, fuses must be replaced each time they open, while C/Bs can be reset.
RE: battery protection
Aside from choice of overcurrent protection, if this is for a safety-related stationary application—please, take my word for it—specify closely monitored high-grade current and voltage bird-dogging for the pair. [Was party to one $30-miilion “oops/oversight.”]
RE: battery protection
RE: battery protection
RE: battery protection
RE: battery protection
RE: battery protection
Any C/B can only open when current flow through it exceeds its settings.
If you mean will it open for current flow in either direction, the answer is yes.
If you mean will it open for a fault upstream that no current through it is feeding, the answer is no.
RE: battery protection
You are absolutely correct that many chargers have current limiting on their rectifiers, which offers some degree of protection against a fault, but is mainly there to restrict the maximum charging current and to prevent the rectifier melting when charging a depleted battery. The current limit does not reduce the available fault from the battery itself, just limits the contribution from the charger.
Most industrial batteries can deliver a fault current far in excess of the charger which feeds them. It would be hazardous to omit a protective device in the battery circuit itself, regardless of whether the charger has a limit or not. Large DC batteries are worthy of respect.
RE: battery protection
RE: battery protection
One of us must be mis-interpreting something!
My comment was based on a situation where cabling or busbar between the battery and the charger was damaged, or the charger suffered an internal failure. The battery would feed into the fault in both these situations if there was no fuse or CB for the charger (unless the battery has its own fuse or CB)
RE: battery protection
RE: battery protection
RE: battery protection
can a DC MCB protect both sides of itself?
///Where do you have it installed or designed?\\\
RE: battery protection
RE: battery protection
RE: battery protection
In charger, the MCB is always on the AC input supply side and includes auxiliary contacts to monitor its status. The point where the battery supply is paralleled with the charger supply and then passed to the DC distribution board, there is no additional switchgear.
The above I wrote from experience with large lead acid batteries of 1000AH and more and hope will be of use to you.
RE: battery protection
RE: battery protection
http://www.squared.com/us/products/circuitb.nsf/07a0210...$FILE/2496.pdf
http://www.squared.com/us/products/circuitb.nsf/07a0210...$FILE/0730CT9801.pdf
http://www.squared.com/us/products/circuitb.nsf/0/0efd0...$FILE/100a.pdf
http://www.squared.com/us/products/circuitb.nsf/0/0efd0...$FILE/2000a-2500a.pdf