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Reason analyzing and locating method for high resistance grounding fault of transmission line

A high-resistance ground fault and transmission line technology, applied in the direction of measuring electricity, measuring electrical variables, measuring devices, etc., to achieve the effect of improving efficiency, shortening fault inspection time, and reducing inspection range

Inactive Publication Date: 2015-01-28
STATE GRID CORP OF CHINA +1
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  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the high resistance of the ground fault, the resistance of the ground point is very large, and the accuracy of fault location is very low, which cannot effectively guide the fault line inspection. Generally, the search for the cause of the transmission line fault can only be carried out by searching the entire line.

Method used

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  • Reason analyzing and locating method for high resistance grounding fault of transmission line

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Embodiment Construction

[0020] The method for analyzing and finding the cause of the high-resistance grounding fault of the transmission line is implemented as follows in the search for the cause of the overhead transmission line fault:

[0021] 1. Analysis of fault recording diagram. After a fault trips on the transmission line, first extract the fault recorder on both sides. The recorder should be characterized by a slight drop in the fault voltage and an insignificant increase in the fault current. At the same time, extract the voltage and current values ​​at a certain moment to estimate the size of the grounding impedance , When the grounding impedance of 220kV line is greater than or equal to 100Ω; the grounding impedance of 330kV line is greater than or equal to 150Ω; the grounding impedance of 500kV line is greater than or equal to 300Ω;

[0022] 2. Use the all-digital real-time simulation APSS system for simulation analysis. After the high-resistance grounding fault is determined, according ...

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Abstract

The invention discloses a reason analyzing and locating method for a high resistance grounding fault of a transmission line. The method comprises: obtaining simulated analysis chart of the high resistance grounding faults of the transmission line in different zones by an all-digital real-time simulation APSS system, and comparing with an actual fault oscillograph, wherein the zone corresponding to the highest waveform similarity is the specific zone where the fault is most likely to occur; comparing the typical fault type oscillograph with the actual fault oscillograph to obtain the most possible fault reason. According to the method provided by the invention, the zone where the high resistance grounding fault of the transmission line occurs can be more accurately determined, fault inspection can be performed in a targeted manner, inspection range of line fault inspectors is reduced, and fault inspection time is shortened; reason for the high resistance grounding fault of the transmission line can be more accurately determined, and fault analysis efficiency is improved.

Description

[0001] technical field [0002] The invention relates to a method for analyzing and finding the cause of a high-resistance grounding fault of a power transmission line, and belongs to the technical field of fault analysis of a power transmission line. Background technique [0003] Transmission line tripping faults have a great impact on the stable and reliable operation of the power grid. According to relevant data analysis, 80% of the accidents in the power grid occurred in the line part, and some of them tripped for unknown reasons, and the tripping of the transmission line must have its own reasons. Only when the real reason for the trip is found can we take targeted preventive measures Therefore, it is particularly important to accurately and quickly find the cause of transmission line faults. This is especially true for high-resistance ground faults on transmission lines. When a single-phase high-resistance ground fault occurs on a transmission line, the voltage bet...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/00
Inventor 李阳林饶斌斌周友武张宇李升健
Owner STATE GRID CORP OF CHINA
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