protective devices
protective devices
(OP)
I have a question regarding the protective device voltage. The utility is 34.5kV and the relay connected to the S&C vista SWGR is rated at 23000V. I always thought that the protective device voltage should always be higher than the bus voltage. Please advise...
Thanks
Thanks






RE: protective devices
A 4-wire multigrounded neutral system has a line to neutral voltage of around 20 kV (19.92 kV). If the exposure for faults is all cable, then it is customary to use 23 kV fuses because you'll get just phase to ground faults. If however the exposure is overhead line, where phase to phase faults are possible, then you'll need a 38 kV rating.
RE: protective devices
RE: protective devices
Alan
"The engineer's first problem in any design situation is to discover what the problem really is." Unk.
RE: protective devices
RE: protective devices
RE: protective devices