Relay protection malfunction distance measuring and calibrating method of electric power system

Abstract

The invention relates to a relay protection malfunction distance measuring and calibrating method of an electric power system, which comprises the following steps: 1. inputting: inputting one-tower double-circuit line parameters, inputting definite value parameters and inputting the malfunction report parameters of a relay protection device; 2. selecting an operating mode; 3. calculating: successively calculating a distance measuring result L'1 of the calibrated relay protection device when a zero sequence compensating coefficient is K'1, a distance measuring result L'2 of the calibrated relay protection device when the zero sequence compensating coefficient is K'2 and a distance measuring result L'3 of the calibrated relay protection device when the zero sequence compensating coefficientis K'3; and 4. storing a calculated result. The distance measuring and calibrating method provided by the invention has the beneficial effects that distance measuring errors of the relay protection device are greatly reduced; a malfunction position can be accurately judged; the circuit walking time after malfunction is shortened; and the safe and reliable operation of an electricity grid is ensured.

Description

technical field [0001] The invention relates to a distance measurement and correction method for relay protection faults in electric power systems, which is suitable for grounding faults of double-circuit lines on the same tower. Background technique [0002] Line faults often occur in the power system during operation, and the relay protection device judges according to the type of line fault and acts to remove the fault. Regardless of whether it is an instantaneous fault or a permanent fault, the line department must know the approximate location of the fault in order to conduct line investigation and accurately determine the location of the fault. The location of the fault is mainly located by the distance measuring device of the power system, but under certain special system parameters, operation mode and fault location, due to the error in the distance measurement of the distance measuring device, the line inspection time after the accident will be too long , and even...

AI Technical Summary

Problems solved by technology

[0013] Since there are certain errors in the ranging results of the above three ranging devices, in actual operation, when a power system line fault occurs, the ranging results of the three ranging devices are analyzed and compared,

Images