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Single-phase ground fault type diagnosis method for ultra-high voltage alternating current transmission line

A single-phase ground fault, UHV AC technology, applied in fault locations, circuit devices, emergency protection circuit devices, etc., can solve problems such as long troubleshooting time and heavy line troubleshooting tasks.

Active Publication Date: 2013-06-19
STATE GRID FUJIAN ELECTRIC POWER CO LTD +3
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  • Abstract
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Problems solved by technology

However, at present, none of the relay protection devices provides a method that can effectively identify the types of low-, medium-, and high-resistance grounding faults in UHV AC transmission lines, resulting in heavy troubleshooting tasks and long troubleshooting times for power management departments.

Method used

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  • Single-phase ground fault type diagnosis method for ultra-high voltage alternating current transmission line
  • Single-phase ground fault type diagnosis method for ultra-high voltage alternating current transmission line
  • Single-phase ground fault type diagnosis method for ultra-high voltage alternating current transmission line

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Embodiment Construction

[0018] The technical solutions of the present invention will be further described in detail below in conjunction with the embodiments.

[0019] figure 1 CVT is a voltage transformer, and CT is a current transformer. The protection device samples the voltage of the voltage transformer CVT and the current waveform of the current transformer CT at the installation place of UHV AC transmission line protection to obtain the instantaneous value of voltage and current, and uses Fourier transform to obtain the instantaneous value of voltage and current. Algorithm Calculation of Fault Phase Voltage at UHV AC Transmission Line Protection Installation , fault phase current , fault phase negative sequence current and zero sequence current ; Among them, φ=A, B, C phase.

[0020] Protection device calculation take the lead angle θ 1 ,calculate take the lead angle θ 2 , to calculate the positive sequence impedance z of the UHV AC transmission line per unit length 1 The ph...

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Abstract

The invention discloses a single-phase ground fault type diagnosis method for an ultra-high voltage alternating current transmission line. The method includes the steps: firstly, modeling by a lumped parameter model and calculating a fault distance according to the linear relation between voltage drop and the fault distance from an ultra-high voltage alternating current transmission line protection mounting position to a single-phase ground fault point; secondly, accurately describing physical characteristics of voltage and current transmission of the ultra-high voltage alternating current transmission line by a long line equation and calculating compensation current of the transmission line according to the calculated fault distance; and thirdly, accurately diagnosing single-phase ground fault types of the ultra-high voltage alternating current transmission line according to single-phase ground fault type diagnosis criteria of the ultra-high voltage alternating current transmission line. The method is applicable to single-phase low, medium and high resistance ground fault type diagnosis in the whole fault process of the ultra-high voltage alternating current transmission line, and diagnosis performances are not affected by factors such as transition resistance, load current and system operation modes.

Description

technical field [0001] The invention relates to the technical field of electric power system relay protection, in particular to a method for diagnosing single-phase grounding fault types of UHV AC transmission lines. Background technique [0002] The transmission corridor of the UHV AC transmission line is wide and the operating environment is complex. There are many factors that cause the single-phase ground fault of the UHV AC transmission line. isolation. Then the line inspectors search for the fault point across the mountains to eliminate the fault, resulting in a heavy task of troubleshooting the line, and the time required for troubleshooting is long, which is not conducive to the rapid restoration of power supply and has an impact on the social economy. [0003] Single-phase ground faults account for more than 90% of the various fault types of UHV AC transmission lines. Factors causing single-phase ground faults of UHV AC transmission lines include low-resistance sin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/02
CPCG01R31/085H02H3/162H02H3/387
Inventor 曾惠敏林富洪
Owner STATE GRID FUJIAN ELECTRIC POWER CO LTD
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