Device for monitoring short circuits and overloads in electronic

Details Device for monitoring short circuits and overloads in electronic Device for monitoring short circuits and overloads in electronic

1985-12-10

1989-01-03

Eisenzopf, Reinhard J.

Electricity: measuring and testing

Electromechanical switching device

Relay

324537, 361 93, G01R 3102

Patent

active

047959800

ABSTRACT:
A device for monitoring short circuits and overloads in electronic proximity switches of a transmission line. The device is a testing circuit which includes a current pickup which measures the current in the output circuit of a respective proximity switch which controls the output current flow by switching off or limiting the output current flow. The device also includes a circuit which provides a testing cycle for the current measurement with first and second delay times which control the output current during a short circuit or overload and a waiting time, substantially longer than the first delay time, between the start of two successive delay times. The length of the first delay time is chosen with respect to the time constant of the respective transmission line to be connected.

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Schweitzer, "Digital Programmable Time-Parameter Relay Offers Versatility and Accuracy", IEEE Trans. on Power Systems, vol. PAS-99, No. 1, Jan./Feb., 1980, pp. 152-157.

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