Judging methods of single phase-to-earth fault and resonance overvoltage fault in small current grounding system

A single-phase ground fault and resonant overvoltage technology, which is applied in the direction of fault location, measurement of electricity, and measurement of electrical variables, can solve problems such as error handling, endangering the safe operation of the power grid, and misjudgment of fault types by power operation dispatchers to achieve protection The effect of safe operation

Inactive Publication Date: 2011-04-06
广元电业局
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Problems solved by technology

Therefore, the electric power operation dispatcher misjudges the fault type
And lead to the c

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  • Judging methods of single phase-to-earth fault and resonance overvoltage fault in small current grounding system
  • Judging methods of single phase-to-earth fault and resonance overvoltage fault in small current grounding system

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[0016] In order to enable operation dispatchers to accurately determine the type of fault according to the law of voltage fluctuations in the system when voltage fluctuations occur in the system, quickly deal with the faults, and ensure the safe operation of the power grid, the following are the differences in common faults such as resonance overvoltage, single-phase grounding and line disconnection. Characterization, classification and analysis are as follows:

[0017] Fault characteristics:

[0018] 1. Single-phase ground fault

[0019] According to the different grounding conditions, grounding is divided into metallic grounding and non-metallic grounding. When one-phase metallic (such as porcelain bottle, lightning arrester breakdown, insulation breakdown of distribution transformer windings, etc.) is short-circuited to ground, the phase voltage is characterized by zero fault phase voltage, non-fault phase voltage rises to line voltage, neutral point displacement voltage It is t...

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Abstract

The invention relates to judging methods of the single phase-to-earth fault and the resonance overvoltage fault in a small current grounding system. When the system has a single phase-to-earth fault, the voltage of the earthed phase is reduced, the voltage of the non-earthed phase is increased; if the earth point is metallic grounded, the voltage of the earthed phase is zero, the voltages of the other two phases are increased to the line voltage and the brightness of a harmonic elimination lamp arranged on a PT open-delta winding is higher than 10% of the brightness under the rated voltage; when the system has a resonance fault, the voltages of the three phases are higher than the line voltage and change irregularly and the harmonic elimination lamp has different brightnesses according to different harmonic degrees; and if the voltage of one phase is reduced, the voltages of the other two phases are not higher than the line voltage and the line voltage is normal, the system is judged to have a single phase-to-earth fault; and when the voltmeter has an irregular swinging phenomenon, the system has a resonance overvoltage fault. By using the methods, the common faults of the small current system can be judged easily and practically; and the methods are accurate, reliable, convenient and practical.

Description

technical field [0001] The invention relates to a method for discriminating a fault in a grounding system of electric power equipment, in particular to a method for discriminating a single-phase grounding fault and a resonant overvoltage fault in a small current grounding system. Background technique [0002] When the low-current grounding system occurs in the single-phase grounding and resonance states, the zero-sequence voltage rises, the three-phase voltage of the system is unbalanced, and a grounding signal occurs. The phenomenon is very similar. Therefore, the electric power operation dispatcher misjudges the fault type. And lead to the corresponding error processing, which seriously endangers the safe operation of the power grid. Contents of the invention [0003] The purpose of the present invention is to provide a method for distinguishing single-phase ground faults and resonance overvoltage faults in small current grounding systems, so as to accurately determine ...

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Application Information

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IPC IPC(8): G01R31/02G01R31/08
Inventor 罗军川
Owner 广元电业局
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