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Metal oxide lightning arrester online monitoring method

A technology of oxide and surge arrester, which is applied in the field of online monitoring of metal oxide surge arresters, can solve problems such as monitoring result errors, achieve low delay, stable working performance, and improve the effect

Inactive Publication Date: 2015-08-19
NANJING UNIV OF INFORMATION SCI & TECH
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Problems solved by technology

However, these methods are all affected by the harmonic voltage in the grid voltage and the grid frequency fluctuation, which will cause large errors in the monitoring results.

Method used

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  • Metal oxide lightning arrester online monitoring method
  • Metal oxide lightning arrester online monitoring method
  • Metal oxide lightning arrester online monitoring method

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Embodiment

[0029] figure 1 It is an overall flowchart of the present invention. First, the voltage signal u applied to the MOA is obtained through the voltage transformer, and the leakage current signal flowing through the MOA is obtained through the through-hole current sensor. At this time, the obtained leakage current signal may have more high-frequency interference signals, so the The obtained leakage current signal is filtered by a low-pass filter to eliminate part of the high-frequency signal interference, so as to obtain a measurement leakage current i that is closer to the real m . Second, the voltage u and the measured leakage current i m Send it to the terminal processor through the ZigBee module, and use the terminal processor to judge and display the aging condition of the MOA. The ZigBee module includes a ZigBee sending module and a ZigBee receiving module, the ZigBee sending module is connected to a voltage transformer and a low-pass filter, and the ZigBee receiving modu...

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Abstract

The invention discloses a metal oxide lightning arrester MOA online monitoring method. Parameters reflecting MOA aging in a model are solved by fitting and approximation of a leakage current calculated value in the equivalent model to an actual leakage current measured value via utilizing a genetic algorithm so that the aging situation is accurately monitored. Influence of harmonic voltage and frequency fluctuation on MOA online monitoring accuracy in power grid voltage is overcome by the method, and the MOA aging situation can be more accurately monitored without performing complex FFT computation on leakage current to overcome interference signals in current signals so that the MOA aging monitoring effect is effectively enhanced. The method is simple in circuit design, stable in working performance and high in anti-interference capability so that a wireless transmission method is quite easy to change, and thus MOA aging long-distance online monitoring is realized.

Description

technical field [0001] The invention relates to the technical fields of electronics, smart grids, and electric equipment lightning protection, in particular to an online monitoring method for metal oxide arresters. Background technique [0002] Lightning has a strong electromagnetic pulse phenomenon, which can cause strong damage to electronic equipment. Lightning disasters have been announced by the United Nations as one of the 10 most serious natural disasters. Metal oxide arrester (MOA) is an important overvoltage protection device in the power system, which provides a safe and reliable operating environment for transformers and cable lines. During the use of MOA, due to various factors, its performance will undergo irreversible changes, which will eventually lose its protective effect on the circuit, and even cause a ground fault in the power grid, resulting in a power outage. For example, MOA aging caused by lightning overvoltage, operating overvoltage and other overvo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/00
Inventor 杨仲江曹洪亮李鹏飞姜苏陈超
Owner NANJING UNIV OF INFORMATION SCI & TECH
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