short circuit contribution of overloaded utility transformer
short circuit contribution of overloaded utility transformer
(OP)
Does a 12kv-.48kv 3Ph transformer loaded beyond it's rating, i.e 2500KVA transformer loaded to 3000KVA, have any impact on the available short circuit values during a fault on the secondary side of the transformer?






RE: short circuit contribution of overloaded utility transformer
Very shortly: NO.
Actually you calculate SC according to Uk% of trafo.
Regards.
Slava
RE: short circuit contribution of overloaded utility transformer
A couple of secondary factors:
Pre-fault voltage at the secondary could be somewhat changed, due to the loading as well as action of upstream LTC or voltage regulator trying to compensate.
Heavily loaded motor may indicated a lot of motors on the secondary side that will cause an increase in the fault current related to motor contributions.
RE: short circuit contribution of overloaded utility transformer
Motor load will affect the asymetrical fault level, but unless you have syncronious motors they will have no effect on the symetrical short circuit level. And sence most fault studies are for symetrical short circuit, the load shouden't matter.
RE: short circuit contribution of overloaded utility transformer
RE: short circuit contribution of overloaded utility transformer