Work state early-warning method and system for high-voltage insulator of electrical railway

A high-voltage insulator, working state technology, applied in the field of electric power, can solve the problem of insulator leakage current and fail to warn the safety of high-voltage insulator running state, and achieve the effect of being accurate and easy to use

Active Publication Date: 2016-01-20
BEIJING ZHONGHENGRUI TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Therefore, the technical problem to be solved by the present invention is to overcome the defect that the monitoring insulator leakage current in the prior art cannot give a good safety warning to the operating state of the high-voltage insulator, thereby providing a method for early warning of the working state of the high-voltage insulator in the electric railway and system

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  • Work state early-warning method and system for high-voltage insulator of electrical railway
  • Work state early-warning method and system for high-voltage insulator of electrical railway
  • Work state early-warning method and system for high-voltage insulator of electrical railway

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Embodiment 1

[0051] Such as figure 1 As shown, this embodiment provides a method for early warning of the working state of an electric railway high-voltage insulator, including the following steps:

[0052] S1: Sampling the leakage current of the insulator to obtain the sampling data of the leakage current of the insulator. For example, it can be sampled through the current acquisition loop, and the sampling can take half a cycle of the power frequency (10ms) as a working cycle, and the power frequency waveform can be locked by the phase-locked loop. Before step S1, it may also include collecting the maximum magnitude of the insulator leakage current and judging whether the maximum magnitude exceeds the preset threshold, and if so, proceed to steps S2 and S3, which are equalized by voltage comparators in the prior art. It can be realized, and will not be described in detail here; since the working state of the insulator may start to deteriorate only when the maximum magnitude of the leaka...

Embodiment 2

[0066] Such as figure 2 As shown, the present embodiment provides a working state early warning system for electric railway high-voltage insulators, including:

[0067] The collecting part 1 is connected with the insulator and is used for sampling the leakage current of the insulator to obtain the sampling data of the leakage current of the insulator. Specifically, the collection unit 1 can be hung on the leakage line of each string of insulators. Most of the collection components in the prior art realize the sampling of insulator leakage current by passing through the leakage line, but in real life, many insulators are close to the utility poles, at this time the collection components in the prior art will not be able to pass through The purpose of sampling the leakage current of the insulator is achieved by using the leakage line. The collection part mentioned in this embodiment can be designed in a ring shape, which is set on the utility pole to achieve the purpose of sam...

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Abstract

The invention provides a work state early-warning method and system for a high-voltage insulator of electrical railway. The leakage current of the insulator is sampled to obtain sampling data of leakage current of the insulator; the frequency spectrum of low-frequency pulse and the scale crossing rate of high-frequency pulse of the leakage current of the insulator are obtained according to the sampling data; the pulse form of the leakage current is restored according to the frequency spectrum and the scale crossing rate; and the corresponding work state of the insulator is determined according to the pulse form. The form of leakage current is regular in the whole work period of the insulator, the method and system determine the work state of the insulator by utilizing the spectral form characteristic of the leakage current instead of utilizing one threshold of the leakage current as in the prior art, the method and system are suitable for different environments, and use is accurate and convenient.

Description

technical field [0001] The invention relates to the field of electric power technology, in particular to a method and system for early warning of the working state of high-voltage insulators on electric railways. Background technique [0002] A large number of high-voltage insulators are used on the power supply lines of electrified railways, and the working status of high-voltage insulators is directly related to the safety of railway operations. The working state of high-voltage insulators generally has four stages: first, the stage of contamination on the surface of insulators. In this stage, the leakage current of insulators is mainly at power frequency, and the amplitude is less than 1mA. For damaged insulators, such as: zero-value insulators and cracked insulators In this stage, there will be high-frequency corona pulses; secondly, the surface of the insulator is wet; in this stage, the dirty layer on the surface of the insulator absorbs water, the insulation resistanc...

Claims

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Application Information

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IPC IPC(8): G01R31/02G01R31/00
Inventor 张涛李宗毅
Owner BEIJING ZHONGHENGRUI TECH CO LTD
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