CB Fail Philosophy wrt to current check
CB Fail Philosophy wrt to current check
(OP)
There are two school of thought regarding the philosophy for setting current check/fault detector associated with CBF or BF scheme. One is to set current check at a low threshold level of say 0.2 pu to confirm if the breaker has opened and is used to reset the CBF scheme.
Other is to set current check above the load current to make it more secure against inadverent operation of the CBF scheme while being tested.My question is which of the two philosophy would you endorse/recommend and why?
Other is to set current check above the load current to make it more secure against inadverent operation of the CBF scheme while being tested.My question is which of the two philosophy would you endorse/recommend and why?






RE: CB Fail Philosophy wrt to current check
A significant advantage of every relay doing its own breaker failure protection is the elimination (reduction) of those inputs that can cause breaker failure initiation on spurious assertion of the input.
RE: CB Fail Philosophy wrt to current check
It is historical issue.
Setting of BFP according to fault current or load current, with additional criterion, is better, IMHO.
RE: CB Fail Philosophy wrt to current check
RE: CB Fail Philosophy wrt to current check
RE: CB Fail Philosophy wrt to current check