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

A technology of overlapping timing and compensating circuits, which is applied to circuit devices, emergency protection circuit devices, electrical components, etc., and can solve problems such as no such technology

Inactive Publication Date: 2012-04-11
KUNMING UNIV OF SCI & TECH
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  • Superposed sequential setting method of inhibition band parallel reactor compensation line three-phase reclosing overvoltage
  • Superposed sequential setting method of inhibition band parallel reactor compensation line three-phase reclosing overvoltage
  • Superposed sequential setting method of inhibition band parallel reactor compensation line three-phase reclosing overvoltage

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Embodiment Construction

[0056] The present invention will be further described below in conjunction with the accompanying drawings and embodiments, but the protection scope of the present invention is not limited to the content described.

[0057] The specific steps are as follows:

[0058] 1.1 Use the WARD equivalent method to calculate the equivalent impedance at the first and last busbars of the fault line , , determine the large and small power supply sides at the beginning and end of the line according to the equivalent impedance; if , then the head end of the line is the large power supply side, and the end is the small power supply side, if > , then the first end of the line is the small power supply side, and the end is the large power supply side;

[0059] 1.2 The terminal voltage of the faulty phase after the circuit breaker at both ends of the faulty phase trips and the induced voltage during two-phase operation under maximum load conditions , to determine the nature of the s...

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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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Application Information

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IPC IPC(8): H02H3/06H02H7/26
Inventor 孙士云束洪春王家永孙向飞董俊
Owner KUNMING UNIV OF SCI & TECH
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