Synchronizing check relay

Details Synchronizing check relay Synchronizing check relay

1978-01-25

1980-08-19

Hix, L. T.

Electrical transmission or interconnection systems

Plural supply circuits or sources

Connecting or disconnecting

H02J 308

Patent

active

042186250

ABSTRACT:
A synchronizing check relay is used in an electrical transmission network for controlling a circuit breaker to interconnect first and second transmission lines to establish power flow therebetween and includes an input circuit for receiving signals from first and second transmission lines. A phase difference generator generates a phase difference signal proportional to a phase difference between said signals from said first and second transmission lines. A phase difference comparator receives the phase difference signal and produces a phase output signal at a selected phase condition. An adjustable timer produces a timer signal after a selected time interval in response to the phase comparator to insure a proper phase difference between the transmission lines. The voltage sensor produces a breaker closing inhibit signal when one of the alternating current voltages is outside a reference limit. A control circuit is responsive to the phase output signal, the time signal and the breaker closing inhibit signal for providing a control response to the circuit breaker.

REFERENCES:
patent: 3312864 (1967-04-01), Schwanenflugel
patent: 3748489 (1973-07-01), South
patent: 3794846 (1974-02-01), Schlicher
patent: 4096395 (1978-06-01), Bogel
patent: 4121111 (1978-10-01), Crisafulli

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