MV Fused Disconnect
MV Fused Disconnect
(OP)
If we don't want to use breaker on incoming 4160V feeder, is it possible to use "remote" operated fused disconnect? (same as we do for low voltage).
When was the last time you drove down the highway without seeing a commercial truck hauling goods?
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RE: MV Fused Disconnect
"Will work for (the memory of) salami"
RE: MV Fused Disconnect
The fuse supplies short circuit protection, the contactor does the on/off control. A protective relay or other overcurrent device is needed to trip the contacotr for overload protection.
Large loads can create fuse sizing issues relative to the contactor interrupting rating. A fuse large enough to carry the load may not protect the contactor during short circuit. Worst case is a ground fault that starts tripping the ccntactor but escalates into a phase-phase fault before the contacts open.
RE: MV Fused Disconnect
As it is a non-motor load, so will it be ok to not used contactor and relay at all (and use only fused-disconnector)?
RE: MV Fused Disconnect
"Will work for (the memory of) salami"
RE: MV Fused Disconnect
The arming process also latches the manual operating lever in the openning position.
Tripping / openning of the load- break switch is achieved by energizing a shunt trip coil, which rotates the blocking rod to enable the switch main arm to go through the slotted rod achieving a quick break operation.
Closing is done manually.
As indicated already ,motorized operator can be fitted for remote openning and closing.
Only one of the devices can be fitted at any one time.
RE: MV Fused Disconnect
RE: MV Fused Disconnect
Most arc flash are mainly attributed to human error. I would have no reservation in operating the manual handle with or without a bomb suit. The gear are designed to be operated manually ... But not for everyone it seems.
perhaps the industry have taken the arc flash issue to far ... Even though we had a recent fatality lately due to human error working on improperly isolated gear ... And it was called an arc flash incident.