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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, which is applied to 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: 2015-07-01
STATE GRID FUJIAN ELECTRIC POWER CO LTD +3
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  • Abstract
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  • Application Information

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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

[0017] The technical solutions of the present invention will be further described in detail below in conjunction with the embodiments.

[0018] 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 Wherein, φ is A phase, B phase or C phase.

[0019] 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 ...

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Abstract

A single-phase earth-fault diagnosis method for an ultra-high-voltage alternating-current transmission line. In the method, the lumped-parameter model is first used to build a model, then fault distance is calculated on the basis of the linear relationship between the voltage drop from the relay location of the ultra-high-voltage alternating-current transmission line to the single-phase earth-fault point and on the basis of the fault distance. Next, a long-line equation is used to precisely describe the physical properties of the voltage and current transmission of the ultra-high-voltage alternating-current transmission line; and the calculated fault distance is used to calculate the compensation current of the transmission line. Thus, ultra-high-voltage alternating-current transmission line single-phase earth-fault diagnosis criteria are used for precision diagnosis of a single-phase earth-fault on an ultra-high-voltage alternating-current transmission line. The method is suitable for use in single-phase low / medium / high resistance earth-fault diagnosis during the overall fault process of an ultra-high alternating-current transmission line. Diagnosis is not affected by such factors as transition resistance, load current, and system operation mode.

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. The factors that cause single-phase ground faults of UHV AC transmission lines include low-resista...

Claims

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Application Information

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Patent Type & Authority Patents(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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