High voltage overhead transmission line insulator pollution monitoring new method

An insulator and pollution technology, which is applied in the field of insulator pollution monitoring of overhead transmission lines, can solve problems such as the inability to predict the critical pollution arc length, voltage and current, and the inability to accurately characterize the pollution degree of insulators, so as to improve effectiveness and reliability, Effect of suppressing high-frequency interference and noise

Inactive Publication Date: 2016-12-07
全玉生 +2
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  • Application Information

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Problems solved by technology

These parameters can roughly reflect the overall situation of the pollution of the insulator, but they cannot accurately characterize the pollution degree of the insulator and the influence of various factors, let alone predict the critical pollution arc length, voltage and current under operating conditions and site conditions

Method used

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  • High voltage overhead transmission line insulator pollution monitoring new method
  • High voltage overhead transmission line insulator pollution monitoring new method
  • High voltage overhead transmission line insulator pollution monitoring new method

Examples

Experimental program
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Embodiment Construction

[0038] In order to verify the correctness of the method proposed by the present invention, the inventor has carried out artificial pollution test in the laboratory. The test circuit diagram and the actual wiring diagram are attached figure 2 , 3 shown.

[0039] The model of the insulator is FXBW-220 / 120-2, and the insulator is stained by the solid layer method. Use an oscilloscope to record the leakage current and the voltage waveform across the insulator. When the voltage is 200kV, the voltage and current waveforms are as attached Figure 4 , 5 shown. Because the actual collected signal contains a lot of noise and interference. The collected data contains a lot of high-frequency interference, and wavelet analysis is used to filter out the high-frequency interference. The voltage and current waveforms after wavelet analysis are as attached Image 6 , 7 shown.

[0040] The parameters required to obtain the prediction model using the test data are listed in the table ...

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Abstract

A high voltage overhead transmission line insulator pollution monitoring new method is disclosed and belongs to the field of overhead transmission line insulator pollution monitoring. The method is based on an insulator flashover physical model put forward by F. Obenaus, accurate values of electric arc constants n and A in the model are calculated, insulator residual pollution resistance rB can be calculated via a formula derived via an inventor of the invention, critical voltage and current values of an insulator flashover can be further calculated, and an aim of monitoring an insulator pollution degree and predicting a pollution flashover can be attained. According to the high voltage overhead transmission line insulator pollution monitoring new method, the criterion rB synthesizes the pollution degree, moisture conditions and environment factors; an on-site operation voltage and an on-site operation current of an insulator are used as signal sources, and real time on-line monitoring can be realized. Via experimental verification, an insulator pollution degree can be accurately and comprehensive evaluated during operation processes via the high voltage overhead transmission line insulator pollution monitoring new method, and the length of a surface electric arc can be reflected dynamically; dynamic processes in which a local electric arc gradually elongates and insulation distance gradually decreases till a complete flashover occurs can be sensitively reflected.

Description

technical field [0001] The invention belongs to the field of contamination monitoring of overhead transmission line insulators. The present invention proposes a new method for monitoring the pollution of insulators in high-voltage overhead transmission lines. B As a criterion, monitor the pollution degree of insulators; by further calculating the critical pollution layer resistance and critical arc length, the critical voltage and current of insulator pollution flashover can be predicted. It is the core content of the new method to determine the arc parameters along the surface of the polluted insulator. The present invention proposes to use two composite functions (Axi -n and r B (L-x)) is the equation and criterion for determining the creeping arc parameters as the overall variable, and a method for determining the creeping arc length and residual fouling layer resistance of insulators based on the obtained creeping arc parameters is proposed. Criterion of this method r ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/12
CPCG01R31/1245
Inventor 全玉生陈宁师普辛
Owner 全玉生
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