Fuse protection of laterals in a unigrounded systems
Fuse protection of laterals in a unigrounded systems
(OP)
Ok- the specimen in question: a 13.8kv uni grounded system with all customers connected phase-phase. Do lateral taps need 3 phase devices or can fused cutouts do? A classical approach of 140Ts coming off the main trunk line, with 65T and 30T further branching off would be the most desirable. However my concern here is while a downed conductor will (can) blow associated cutouts keeping the main trunk energized, down conductors will continue to remain live from back feed.
I've heard second hand of utilities in California supposedly not fusing laterals for this very reasons (they use delta and uni-grounded).
I've heard second hand of utilities in California supposedly not fusing laterals for this very reasons (they use delta and uni-grounded).






RE: Fuse protection of laterals in a unigrounded systems
Bill
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"Why not the best?"
Jimmy Carter
RE: Fuse protection of laterals in a unigrounded systems
RE: Fuse protection of laterals in a unigrounded systems
Second- if a fuse is blown, are there any over votlages that need to be worried about when opening the remaining two cut-outs or 3 phase gang switch out on the line? I want to make sure current interrupting is sufficient on such a system.