H - Electricity – 02 – H
Patent
H - Electricity
02
H
348/22
H02H 3/30 (2006.01) H02H 7/26 (2006.01)
Patent
CA 2012075
The square wave phase comparison signals generated for each phase of a power distribution system by phase comparison relays at each end of a protected three phase transmission line segment are combined to generate a single, multi-level signal with discrete values for each instantaneous combination of square wave signals. The single, multi-level signal is used to modulate a carrier signal which is transmitted over a single channel of a two- way communications link to the other terminal where the carrier signal is demodulated to reproduce the multi-level signal. The reproduced multi-level signal is then decoded to generate remote square wave signals which are compared with the phase of locally generated square wave signals to generate trip signals for circuit breakers at the respective terminals. Square waves representative of priority functions, such as direct transfer trips, can be integrated into the single, multi-level signal transmitted to the other terminal.
Asea Brown Boveri Inc.
Ogilvy Renault Llp/s.e.n.c.r.l.,s.r.l.
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