초록 ▼

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 d

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.

대표청구항 ▼

In an alternating current electrical transmission system having a pair of lines connected to a circuit breaker, a synchronizing check relay comprising: input means adapted for connection to said pair of lines connected to said circuit breaker, said input means being adapted to detect a first electri

In an alternating current electrical transmission system having a pair of lines connected to a circuit breaker, a synchronizing check relay comprising: input means adapted for connection to said pair of lines connected to said circuit breaker, said input means being adapted to detect a first electrical condition on one of said lines and a second electrical condition on another of said lines; a phase sensor connected to said input means, said phase sensor producing a selected phase sensor output when a difference between a phase of said first electrical condition and a phase of said second electrical condition is at a selected phase condition, said selected phase condition being substantially independent of temperature over a range of temperatures; timing means responsive to said selected phase sensor output for generating a timeout signal after a predetermined time interval, a voltage sensor connected to said input means, said voltage sensor producing a selected voltage sensor output when a potential of one of said electrical conditions is at a selected voltage condition, said voltage sensor condition being substantially independent of temperature; and an output control circuit, said output control circuit being connected to said voltage sensor, said output control circuit also being connected to the circuit breaker, said output control circuit providing a control signal to said circuit breaker when said phase sensor produces said selected phase sensor output and said timing means produces said time-out signal, said voltage sensor including an absolute value sensor, said absolute value sensor producing an absolute value sensor response when a difference between a potential of said first electrical condition and a potential of said second electrical condition exceeds a selected absolute value condition, said selected absolute value condition being substantially independent of temperature over a range of -40°C. to +80°C.