Switch Fuse unit
Switch Fuse unit
(OP)
Is it possible to trip switch fuse unit via external trip signal? In other word does HV (22kv)switch fuse unit have trip coil?
When was the last time you drove down the highway without seeing a commercial truck hauling goods?
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RE: Switch Fuse unit
I have never seen a trip coil on a fuse unit assembly for 22 kv applications. I do not believe what you are inquiring about is possible.
Is there an upstream switching device that can be modified for this application?
Good Luck.
Ang
RE: Switch Fuse unit
RE: Switch Fuse unit
Replace the fuse/switch combination with a circuit switcher or circuit breaker. - Expensive
Add a motor operator to the fuse switch. - Sllooooowwww
Add a high speed ground switch after the fuse to ensure enough fault current to clear the fuse fast. - Make a little fault a big fault
Coordinate your bus protection with the fuses so that you'll never trip the bus for anything the fuse would clear. Bus faults generally draw lots and lots of current while your fuse is probably pretty small. - Best option in my opinion.
RE: Switch Fuse unit
Thanks for that.Your last option seems most prudent but how do you make sure that busbar is physically isolated after genuine bus fault. All other circuits(CBs) will trip by virtue of trip signal emanating from Bus prot scheme but station service bay will remain connected and potentially could back feed low amount of fault current (if there is a source to do so) on to the faulty bus
RE: Switch Fuse unit