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On-line detection method of metal oxide arrester insulating property influencing factor

A technology of insulation performance and influencing factors, which is applied in the field of online detection of influence factors of insulation performance of metal oxide arresters, can solve the problems of shortening the service life of metal oxides, consuming power failure time and maintenance time, wasting maintenance time, etc., so as to shorten the power failure The effect of maintenance time, reducing power failure loss and prolonging service life

Active Publication Date: 2012-08-01
STATE GRID CORP OF CHINA +1
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Problems solved by technology

This approach requires a lot of power outage time and maintenance time, which not only wastes a lot of maintenance time, shortens the service life of metal oxides, but also causes large direct power outage losses and social and economic losses caused by power outages.

Method used

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  • On-line detection method of metal oxide arrester insulating property influencing factor
  • On-line detection method of metal oxide arrester insulating property influencing factor
  • On-line detection method of metal oxide arrester insulating property influencing factor

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Embodiment Construction

[0024] In order to make the object, technical solution and advantages of the present invention clearer, the implementation manners of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0025] An online detection device is provided in the online detection method of the influencing factors of the insulation performance of the metal oxide arrester described in the present invention, and the detection device includes a power collection device connected in sequence, a calculation processing device, a data analysis and judgment device and an output display device , wherein the data analysis and judgment device is also respectively connected to a reference device storing a set current threshold and a memory storing various analysis and judgment structures. First, the power collection device obtains the full current i of the leakage current from the grounding down conductor of the metal oxide arrester x (t), the calculation...

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Abstract

The invention discloses an on-line detection method of a metal oxide arrester insulating property influencing factor. The on-line detection method comprises the following steps of: firstly obtaining total current i x (t) of leakage current from a metal oxide arrester ground downlead, and separating resistive current i r (t) from the total current; calculating a total current amplitude value I x, a resistive current amplitude value I r, fundamental current amplitude value I r 1 in the resistive current and a triple-frequency harmonics electric current amplitude value I r3 in the resistive current; and further calculating an aging coefficient beta of a metal oxide arrester, if the I x is greater than a setting value or the I r is greater than the setting value, judging the insulating property of the metal oxide arrester to be poor, and then forming criteria according to the I r, the I r 1, the I r 3 and beta. The method can exactly distinguish the influencing factor which causes the insulating property of the metal oxide arrester to get poor, is beneficial to shortening power off overhaul time, prolongs the service life of metal oxide, and has very important meanings of reducing power off loss and guaranteeing an electric system to safely and economically operate.

Description

technical field [0001] The invention relates to the protection field of electric equipment, in particular to an online detection method for factors affecting the insulation performance of a metal oxide arrester. Background technique [0002] Metal oxide surge arresters have good nonlinear characteristics and flow capacity, which can protect high-voltage electrical equipment from overvoltage. Overvoltage includes two types: operating overvoltage and lightning overvoltage. Therefore, metal oxide arresters have been widely used in domestic and foreign power grids as protective equipment for high-voltage electrical equipment. [0003] The metal oxide arrester is connected between the high-voltage line and the ground grid. The quality of its own insulation performance directly affects the safety of the protected high-voltage electrical equipment, thereby affecting the safety of the power system. At present, the application of online monitoring can reflect the advantages and disa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/12G01R19/00
Inventor 林富洪陈文景郑宗安杨正刘玉太林集养肖颂勇徐致远柯敏徐志忠郑阿建
Owner STATE GRID CORP OF CHINA
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