Insulator pollution flashover pre-warning method and system based on leakage currents

A leakage current and insulator technology, applied in the direction of testing dielectric strength, etc., can solve the problems of limited frequency range of leakage current signal, inability to reflect the change of insulator leakage current and insulator pollution performance, etc., to achieve fast processing speed, reduce service cost, and facilitate The effect of installation

Inactive Publication Date: 2014-05-28
STATE GRID CORP OF CHINA +2
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the frequency range of the collected leakage current signal is limited, which cannot reflect the relationship between

Method used

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  • Insulator pollution flashover pre-warning method and system based on leakage currents
  • Insulator pollution flashover pre-warning method and system based on leakage currents
  • Insulator pollution flashover pre-warning method and system based on leakage currents

Examples

Experimental program
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Effect test

Embodiment 1

[0060] An insulator pollution flashover warning system and method based on leakage current. The system mainly includes an LED optical fiber sensor, a signal pre-processing module, a data acquisition module, a GPRS wireless transmission module, a solar-battery power supply module, and a data acquisition extension platform. The method mainly includes data collection method and data analysis method. in,

[0061] The LED optical fiber sensor includes a sensor probe and a photoelectric converter.

[0062] The sensor head is composed of two light emitting diodes LED1 and LED2 and two protection circuits. The ports of the same polarity of the two light emitting diodes LED1 and LED2 are connected in series to detect the positive and negative half cycle leakage currents of the tested insulator strings respectively. Each protection circuit is composed of a conduction diode D, a constant voltage diode VSD and a discharge tube GDT connected in parallel. The conduction diode D is connec...

Embodiment 2

[0076] Such as figure 1 As shown, the insulator pollution flashover warning system based on leakage current mainly includes LED fiber optic sensor, signal pre-processing module, data acquisition module, GPRS wireless transmission module, solar-battery power supply module, and data acquisition extension platform.

[0077] The LED optical fiber sensor includes a sensor probe and a photoelectric converter.

[0078] The schematic diagram of the sensor head is attached figure 2 As shown, it consists of two light-emitting diodes LED1 and LED2 and two protection circuits. The ports of the same polarity of the two light emitting diodes LED1 and LED2 are connected in series to detect the positive and negative half cycle leakage currents of the tested insulator strings respectively. Each protection circuit is composed of a conduction diode D, a constant voltage diode VSD and a discharge tube GDT connected in parallel. The conduction diode D is connected in parallel with the reverse ...

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Abstract

The invention discloses an insulator pollution flashover pre-warning method and system based on leakage currents. An insulator pollution flashover pre-warning test system and the pollution flashover pre-warning method are provided based on deep study carried out on the acquiring of the leakage currents of supporting insulators, signal processing and extraction of characteristic quality. The test system comprises an LED optical fiber sensor, a signal preprocessing module, a data collecting module, a signal transmitting module, a power supply module and a data collecting and analyzing module. Through the utilization of the test system, pollution flashover measurement data are obtained, and finally a neural network model is obtained. The invention further provides the insulator pollution flashover pre-warning system based on the neural network model obtained through the scheme. Effective values, amplitude values, the number of pulses and relative humidity of the environment where the insulators located are regarded as input quantity of the neural network model to obtain the pollution grade of the insulators.

Description

technical field [0001] The invention belongs to the technical field of online pollution flashover monitoring of electrical equipment, and specifically relates to the pollution degree of the leakage current of a post insulator on a substation isolating switch and the development and method research of an online pollution flashover monitoring system. Background technique [0002] Since the electrical outer insulation of transmission lines and substations is exposed to the air for a long time, there will be solid, liquid and gaseous contamination particles deposited on the surface of the electrical outer insulation. Under the action of bad weather conditions, the electric strength of insulators will be greatly reduced, so that the insulators of transmission lines and substations may not only flashover under the action of overvoltage, but more seriously, flashover may also occur under the action of long-term operating voltage. network, causing partial or large-scale power outage...

Claims

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Application Information

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IPC IPC(8): G01R31/12
Inventor 张茂春王剑飞米彦姚陈果芮少琴储怡道董守龙王建
Owner STATE GRID CORP OF CHINA
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