Distance measuring relay for line faults

Details Distance measuring relay for line faults Distance measuring relay for line faults

1987-03-20

1988-07-05

Paschall, M. H.

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific quantity comparison means

361 82, H02H 318

Patent

active

047559039

ABSTRACT:
In a short-circuit distance relay for protecting a single-channel power transmission system with power supplies installed at two ends thereof, when there exists any resistance at a fault point on the power transmission line, an error is induced in measurement of the distance up to the fault point by a voltage drop component flowing through the fault-point resistance from the remote-end power supply. In order to eliminate such error in measuring the distance, the relay of this invention computes the impedance up to the fault point from the information including a positive-phase voltage and a positive-phase current in a normal state of the power transmission system, and also a positive-phase voltage, a positive-phase current and a negative-phase current in a faulty state of the system, whereby the fault-point resistance is rendered unconcerned with the distance to consequently avert the measurement error.

REFERENCES:
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"Protective Relays" by A. R. van C. Warrington, pp. 270-274 (1969).
"Applied Protective Relaying", Westinghouse Electric Corporation, pp. 10-34, 10-42, 10-43 and 10-44 (1976).

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