Fuses as back up protection?
Fuses as back up protection?
(OP)
Normally the loss of distribution feeders from stuck breakers or relays failures is mitigated by a double breaker-double buss or a breaker and a half scheme.
Smaller/ older substations are single breaker single buss, so if one breaker fails the entire buss is lost as well as all outgoing feeders. Is it possible, or practical, to add power fuses in series with the breakers to avoid such a contingency?
Smaller/ older substations are single breaker single buss, so if one breaker fails the entire buss is lost as well as all outgoing feeders. Is it possible, or practical, to add power fuses in series with the breakers to avoid such a contingency?






RE: Fuses as back up protection?
I don't find this possible at higher fault currents.
RE: Fuses as back up protection?
RE: Fuses as back up protection?
RE: Fuses as back up protection?
RE: Fuses as back up protection?
S&C power fuses will be used, so reclosing could be easier to coordinate since these are not standard fuse links.
http://www.sandc.com/products/fusing-outdoor-distr...
RE: Fuses as back up protection?
RE: Fuses as back up protection?
The other option, and Im not sure how to get it to work is motorized air breaks... Basically is a feeder breaker fails to trip, the main buss breaker will trip. The effected circuit will sectionalize via air breaks and once having done so the main buss breaker will reclose. However, from a relaying standpoint I have little idea how to go about it as the distribution level.