Phase shift transformers
Phase shift transformers
(OP)
Why are phase shift transformers used in relaying especifically in substation transmission levels?
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RE: Phase shift transformers
An example of this could be the synchronizing circuit of a unit connected generator - in this case, PTs on the LV side of the unit transformer can be compared against PTs on the HV bus - you would need to compensate for the transformer phase shift in this case.
RE: Phase shift transformers
“A phase shifting transformer is a device which, when connected to a transmission line, is capable of altering the effective phase-angle difference between the two ends of the line. Since power flow over a transmission line is closely related to the phase-angle difference between the line ends, phase shifting transformers allow the flow of power across a line to be adjusted.” [From: http://www.psc.state.wi.us/writings/papers/energy/elecrel/download/transrpt.doc ]
RE: Phase shift transformers