Superposed sequential setting method of inhibition band parallel reactor compensation line three-phase reclosing overvoltage

Abstract

The invention relates to a superposed sequential setting method of inhibition band parallel reactor compensation line three-phase reclosing overvoltage, belonging to the power system relay protection technology field. The method comprises the following steps: by utilizing a WARD equivalent method, calculating equivalent impedances of a head end bus and a tail end bus of a fault line, and determining a large power supply side and a small power supply side; according to a terminal voltage size of a fault phase after trip-out, discriminating a fault property; when the fault is a transient fault, if line actual compensativity is less than critical compensativity, superposing the large power supply side, conversely, superposing the small power supply side; if the fault is a permanent fault, calculating an arithmetic product of a power frequency voltage step-up ratio when superposing the large power supply sides first and a healthy phase voltage step-up ratio caused by a single-phase ground fault, calculating an arithmetic product of a power frequency voltage step-up ratio when superposing the small power supply sides first and a healthy phase voltage step-up ratio caused by a single-phase ground fault, comparing the two arithmetic products, and superposing a side with a smeller arithmetic product. According to the method, line critical compensativity is only related to line length and a phase shift coefficient, raising superposed sequential setting speed in the transient fault is facilitated, amount of calculation is small, the method is simple and feasible, and a line single-phase fault can be reduced effectively to carry out overvoltage level of three-phase reclosing.

Description

technical field [0001] The invention relates to a reclosing sequence setting method for suppressing the overvoltage of a three-phase reclosing circuit of a compensating line with a shunt reactor, and belongs to the technical field of electric power system relay protection. Background technique [0002] As one of the effective measures to improve transmission reliability and transient stability, automatic reclosing device has been widely used. At present, the actual application of the recloser adopts the method of detecting the non-voltage side and reclosing first. This method is formulated according to the safety and stability guidelines of the power system and the electrical operation guidelines, combined with the actual application level of the current reclosing technology. In order to solve the problem of unequal working conditions of the circuit breakers on both sides, in practice, the synchronous verification of the switching input at the beginning and end of the line o...

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