Single-phase adaptive reswitch-on comprehensive criterion realizing method for transmission line

Abstract

This invention is a realizing method of transmitting line unilateral auto-conforming reclosing comprehensive judging evidence, based on voltage evidence, compensation voltage evidence, combination compensation voltage evidence and phase evidence. The characteristics are: if the transmitting line is the instantaneous trouble, the above four evidences judge the trouble character; when the transmitting line has general instantaneous trouble, the voltage evidence judges the trouble character; when the transmitting line occurs low off voltage trouble, the compensation voltage, combination compensation and voltage evidences judge comprehensively, as to the heavy service and long-distance transmitting line or the line with parallel reactor, the phase evidence judges the trouble; if the transmitting line occurs permanent trouble, judge whether carrying out reclosing operation according to the results of comprehensive judgment of the four evidence judging.

Description

technical field [0001] The invention relates to an automatic reclosing control method of a transmission line in a power system, in particular to a method for realizing comprehensive determination of single-phase self-adaptive reclosing of a transmission line. Background technique [0002] Automatic reclosing technology, as one of the important measures to ensure the safe power supply and stable operation of the power system, is currently widely used in overhead transmission lines. The purpose of using automatic reclosing is to automatically put the line back into operation after the transient fault is eliminated, and restore the normal operating state of the system in the shortest time. However, the current automatic reclosing device blindly recloses after the circuit breaker trips, and it cannot judge whether the fault is a transient fault or a permanent fault. Therefore, when a permanent fault occurs, not only cannot the normal power supply of ...

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Problems solved by technology

[0004] Single-phase adaptive reclosing technology has been developed for more than ten years, and many theoretical achievements have been made. The typical one is the voltage discrimination method. This method solves the single-phase adaptive reclosing problem of lines without parallel reactor compensation, but there are also errors possible judgment

For example, for heavy-duty long-distance transmission lines, the line mutual inductance voltage is very large, and the voltage criterion may be misjudged; for lines with shunt reactor compensation, the shunt reactor makes the recovery voltage of the fault phase very small, so the voltage criterion also has misjudgment possibility of

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