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System and method for early warning insulator pollution flashover

A pollution flashover and early warning system technology, applied in the electric power field, can solve the problem of difficult to accurately reflect the pollution status of insulators, such as flashover warning, and achieve the effect of improving accuracy and reliability, and improving reliability.

Inactive Publication Date: 2014-03-26
STATE GRID CORP OF CHINA +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the leakage current method and distributed voltage method based on average value, maximum value and pulse number are greatly affected by factors such as field operating environment climate, insulator material and operating line level, etc. Pollution status and flashover warning

Method used

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  • System and method for early warning insulator pollution flashover
  • System and method for early warning insulator pollution flashover
  • System and method for early warning insulator pollution flashover

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Embodiment Construction

[0021] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that, in the case of no conflict, the embodiments of the present application and the features in the embodiments can be combined with each other.

[0022] First, the principles involved in the present invention will be described in detail below.

[0023] Leakage current refers to the current flowing through the surface of the insulator after the dirty surface of the insulator is damp under the action of operating voltage. Leakage current is a signal that can vary widely. The leakage current is usually only a dozen microamps to several milliamps in normal operation (depending on the transmission voltage and the shape of the insulator). However, when the environment changes (such as humidity increases) and a local flashover occurs on the surface of the insulator, the leakage current is as high as several hundred milli...

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Abstract

The invention discloses a system for early warning insulator pollution flashover. The system comprises a detection unit, a data processing unit and a pre-warning unit. The detection unit is arranged on an insulator, detects the content of the triple frequency harmonic in a leakage current of the insulator and sends the content of the triple frequency harmonic to the data processing unit. The data processing unit compares the data of the content of the triple frequency harmonic received from the detection unit with a preset value, and when the content of the triple frequency harmonic larger than the preset value, pre-warning signals are sent to the pre-warning unit. When the pre-warning unit receives the pre-warning signals, an insulator pollution flashover early warning is sent out. The invention further provides a method for early warning the insulator pollution flashover. Through the system and the method, the pollution condition of the insulator can be monitored more accurately, and therefore the flashover can be early warned about better, and large-scale accidents are prevented from occurring.

Description

technical field [0001] The invention relates to the field of electric power technology, in particular to an insulator pollution flashover early warning system and an insulator pollution flashover method. Background technique [0002] The pollution flashover of insulators is caused by the moisture absorption of dirty substances deposited on the surface of insulators under humid conditions (fog, drizzle, light rain, melting snow, condensation, etc.). The dirt on the surface of the insulator will not reduce the insulation resistance level of the insulator in a dry state. After the surface of the insulator is dirty and wet, the soluble substances in the dirt will gradually dissolve in the water, forming a conductive water film on the surface of the insulator, and the insoluble substances in the dirt will absorb water. These conductive water films and the adsorbed moisture reduce the surface resistance of the insulator, and form a conductive path along the surface of the insulat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R19/25
Inventor 殷军郭洁刘玄
Owner STATE GRID CORP OF CHINA
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