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Neutral line anomaly judgment method based on non-fault phase second harmonic component proportion

A technology for judging the second harmonic component and abnormality. It is applied in the direction of measuring electricity, measuring device, continuity test, etc. It can solve the problem of inability to accurately judge the neutral line and abnormality, and achieve the effect of being less susceptible to interference and improving accuracy.

Active Publication Date: 2021-08-13
CHINA SOUTHERN POWER GRID EHV POWER TRANSMISSION COMPANY WUZHOU BUREAU
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

In the prior art, there is a problem that it is impossible to accurately judge the abnormality of the neutral line

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  • Neutral line anomaly judgment method based on non-fault phase second harmonic component proportion
  • Neutral line anomaly judgment method based on non-fault phase second harmonic component proportion
  • Neutral line anomaly judgment method based on non-fault phase second harmonic component proportion

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[0026] In order to facilitate the understanding of the present application, the present application will be described more fully below with reference to the relevant drawings. Embodiments of the application are given in the drawings. However, the present application can be embodied in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of this application more thorough and comprehensive.

[0027] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the technical field to which this application belongs. The terms used herein in the specification of the application are only for the purpose of describing specific embodiments, and are not intended to limit the application.

[0028] It can be understood that the terms "first", "second" and the like used in this application may be...

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Abstract

The invention relates to a neutral line anomaly judgment method based on a non-fault phase second harmonic component proportion. The method comprises the following steps: identifying a non-fault phase in each phase line, and obtaining a second harmonic component proportion in a secondary current of the non-fault phase; when the proportion of the second harmonic component in the at least one non-fault-phase secondary current is greater than the first proportion value, acquiring a secondary zero-sequence electric signal; and according to the secondary zero-sequence electric signal, determining the abnormal type of the neutral line. The proportion of the secondary harmonic component of the secondary current corresponding to the non-fault phase of the three-phase power supply system is used as the judgment basis of the abnormality of the neutral line, a secondary zero-sequence electric signal is further obtained, and the abnormality type of the neutral line is analyzed based on the secondary zero-sequence electric signal. As the proportion of the secondary harmonic component in the secondary current corresponding to the non-fault phase is very small when the system operates normally, but the proportion of the secondary harmonic component in the secondary current corresponding to the non-fault phase is greatly improved when the neutral line is abnormal, the judgment on the neutral line abnormity based on the proportion of the secondary harmonic component is not easily interfered, and the judgment accuracy is greatly improved.

Description

technical field [0001] The present application relates to the technical field of three-phase power supply system protection, in particular to a neutral line abnormality judgment method, device, computer-readable storage medium and a relay protection device based on the proportion of the second harmonic component of the non-fault phase. Background technique [0002] The three-phase power supply system is closely related to people's daily life and the normal operation of the society. In order to ensure that the three-phase power supply system can respond in time when it encounters a fault, relay protection technology has emerged as the times require. Relay protection technology mainly includes differential protection function, backup protection function, zero-sequence protection and other functions. These functions have good effects in dealing with common faults such as single-phase ground faults in three-phase power supply systems. However, when the neutral line of the second...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/58G01R31/54G01R31/52G01R23/16
CPCG01R31/58G01R31/54G01R31/52G01R23/16
Inventor 温才权闫茂华
Owner CHINA SOUTHERN POWER GRID EHV POWER TRANSMISSION COMPANY WUZHOU BUREAU
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