Insulator pollution level monitoring method based on leakage current phase difference

A leakage current and pollution level technology, applied in the field of level monitoring, can solve problems such as waveform distortion, achieve the effect of small measurement error, reduce power accidents, and improve safety and reliability

Active Publication Date: 2015-12-02
STATE GRID CORP OF CHINA +2
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  • Abstract
  • Description
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Problems solved by technology

There is a waveform distortion in the measurement through the voltage divider, and a certain measurement cost is required

Method used

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  • Insulator pollution level monitoring method based on leakage current phase difference

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Embodiment Construction

[0018] Further illustrate below in conjunction with accompanying drawing and embodiment:

[0019] See attached figure 1 , the figure shows an insulator pollution level monitoring method based on leakage current phase difference, which specifically includes the following 10 steps: S1 monitoring device synchronously collects leakage current I x (n) and the relative humidity of the environment R H , S2 bandpass filtering of leakage current, S3 verification of relative humidity, S4 derivation of voltage fundamental component, S5 extraction of phase information of voltage and leakage current at the same time under different relative humidity, S6 calculation of phase difference of voltage and leakage current, S7 relative Humidity verification, S8 to calculate K value, S9 to query the table of K value and pollution level, and S10 to obtain the pollution level of insulator surface.

[0020] Step S1: The leakage current online monitoring device synchronously collects the leakage curr...

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Abstract

The invention discloses an insulator pollution level monitoring method based on leakage current phase difference. The method is implemented through insulator leakage, and comprises the following steps: a monitoring device synchronously collects leakage current and the relative humidity of the environment; band-pass filtering is carried out on the leakage current; the relative humidity is verified; the fundamental component of voltage is deduced; phase information of voltage and leakage current at the same moment under different relative humidity is extracted; the phase difference between the voltage and the leakage current is calculated; the relative humidity is verified; the K value is calculated; a table of K values and pollution levels is queried to obtain the level of insulator surface pollution. According to the invention, the phase of voltage can be obtained without measuring a voltage signal, the level of insulator surface pollution is evaluated based on the phase difference between the leakage current and the voltage of an insulator and the humidity change, and real-time monitoring of insulator surface pollution level is realized. The method has the advantages of low measurement error and high precision, and can well adapt to porcelain insulators at different voltage levels.

Description

technical field [0001] The invention relates to a method for monitoring pollution level of insulators based on phase difference of leakage current, in particular to a method for monitoring pollution level of insulators based on phase difference of leakage current for transmission lines. Background technique [0002] The insulator is a special insulation control, which is used to support and fix the busbar and the live conductor, and to make sufficient distance and insulation between the live conductors or between the conductor and the earth. With the development of the power system, especially in the transmission line, the demand for insulators is increasing. [0003] The reliability of transmission lines directly affects the safe and reliable operation of power systems. The failure of insulators is the main reason that threatens the safe operation of transmission lines. The insulators of transmission lines are required to operate reliably under atmospheric overvoltage, in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R25/00
Inventor 贾伯岩孙翠英潘瑾关巍范学军张志猛郑雄伟刘杰田霖胡立章
Owner STATE GRID CORP OF CHINA
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