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Method for calculating single-phase earth fault point of parallel double-circuit line

A single-phase ground fault, double-circuit line technology, applied in the direction of the fault location, can solve the problems of huge direct and indirect losses of the national economy, long time, high cost, etc., and achieve the effect of improving measurement accuracy and protection reliability

Inactive Publication Date: 2014-02-19
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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Problems solved by technology

They are extremely expensive to manufacture, and once they are damaged due to a fault, maintenance is difficult and takes a long time, causing huge direct and indirect losses to the national economy

Method used

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  • Method for calculating single-phase earth fault point of parallel double-circuit line
  • Method for calculating single-phase earth fault point of parallel double-circuit line
  • Method for calculating single-phase earth fault point of parallel double-circuit line

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Embodiment Construction

[0035] The preferred embodiments will be described in detail below in conjunction with the accompanying drawings. It should be emphasized that the following description is only exemplary and not intended to limit the scope of the invention and its application.

[0036] figure 1 It is a schematic diagram of a single-phase-to-earth fault in a parallel double-circuit line. Such as figure 1 As shown, the two lines of the parallel double-circuit line are represented by the I line and the II line respectively. figure 1 M and N in represent the two sides of the parallel double-circuit line respectively, and Z MS1 and I MS0 Denote the positive sequence impedance and zero sequence impedance of the M-side system respectively, Z NS1 and I NS0 Represent the positive-sequence impedance and zero-sequence impedance of the N-side system, respectively. In this embodiment, assuming that the distance protection is installed on the M side of the parallel double-circuit line, and the fault ...

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Abstract

The invention discloses a method for calculating a single-phase earth fault point of a parallel double-circuit line in the technical field of power system relay protection. The method comprises the steps that a voltage instantaneous value and a current instantaneous value of the line are collected and phase voltage of a distance protection installation portion fault line, a phase current of the distance protection installation portion fault line and a zero-sequence current of the distance protection installation portion fault line are obtained through Fourier transform; according to the operation state of the parallel double-circuit line, single-phase earth fault impedance Z of the parallel double-circuit line is calculated; according to the single-phase earth fault impedance Z of the parallel double-circuit line, the distance between a distance protection installation portion and the fault point is calculated. According to the method for calculating the single-phase earth fault point of the parallel double-circuit line, the position of the fault point is calculated according to single-ended voltage and a single-ended current of the protected line, the influence of single-phase earth fault impedance measurement of zero sequence mutual inductance of the parallel line is eliminated, and the measurement accuracy of single-phase earth protection and the reliability of single-phase earth protection of the parallel line are greatly improved.

Description

technical field [0001] The invention belongs to the technical field of electric power system relay protection, and in particular relates to a calculation method for a single-phase grounding fault point of a parallel double-circuit line. Background technique [0002] Transmission line is the basic equipment for power generation and transmission in the power system, and occupies a very important position in the power system. When the transmission line is faulty, if it cannot be cut off in time or by mistake, it will have a great impact on the main system, and it will easily cause major accidents such as grid splitting and transformer tripping. Parallel transmission line protection of HV / UHV / UHV lines is responsible for the important task of power transmission and is an important hub of the power system. They are extremely expensive to manufacture, and once they are damaged due to malfunctions, they will be difficult to repair and take a long time, causing huge direct and indi...

Claims

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Application Information

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IPC IPC(8): G01R31/08
Inventor 徐振宇张旭陈婧华王银
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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