To actualize condition-based maintenance for Metal-Oxide Arrestor, which is a kind of important device used to restrain overvoltage in the electric power system, the research of on-line monitoring of MOA is important and necessary.

金屬氧化鋅避雷器MOA作為電力系統(tǒng)重要的過電壓保護設備精品偷拍日韩第一页视频，對其開展在線監(jiān)測是實現(xiàn)狀態(tài)維修的必然要求。

In this case the need for 120 MOA of elevation is unnecessary.

在這種情況下對120海拔MOA的需要是多余的欧美日韩视视频免费午夜在线观看。

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According to equivalent circuit of MOA, the characteristic of leakage current of MOA and some disturb factors are discussed.

本文根據(jù)氧化鋅避雷器的簡化等值電路九九99久久精品国产麻豆，分析了MOA泄漏電流的特性及幾種干擾因素對泄漏電流監(jiān)測的影響。

According to the common faults in the course of the operation of MOA and the fuzzy relationship between the faults and the fault symptoms, the faults set, fault symptoms set,membership function,fuzzy diagnosis matrix,fuzzy operator and diagnosis rules are determined.

根據(jù)MOA運行過程中的常見故障及故障與征兆之間的模糊關系A片日本视频网址，確立了MOA的故障集无码秒播成人影视在线观看免费视频、征兆集、隸屬函數(shù)avpian、模糊診斷矩陣欧美口交网站、模糊算法和故障診斷原則。

Secondly, an optic-electric measuring system for measuring voltage distribution of MOA is developed in this thesis.

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It is easy for us to find out the failure of MOA in power cut test.

現(xiàn)在一般通過停電試驗檢查出MOA的老化缺陷。

Several measures for improving the potential distribution of MOA in EHV power systems were analyzed.

分析表明：超高壓MOA電位分布的改善宜采取綜合改進措施瑟网站。

On-line monitoring the resistive current component of metal oxide arrester timely is very important to the detection of early aging of MOA, but it is very difficult to find the exact resistive current.

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But in practical operating, overvoltage caused by reignition of the vacuum switching device frequently appears, and it result in damage of the capacitor bank or the switchgear itself. Ensuring the switchgear against reignition and installing a protective device are two main approaches to avoid the phenomenon. In this paper, a study on overvoltage caused by reignition due to capacitor bank switching with the vacuum switching device and its preventive measures are carried out. The main work which has been done and researches are as follows: 1. The producing mechanism of overvoltage and its influence factor are analyzed. It is pointed out that single-phase reignition is the main reason for damage of the switchgear and two-phase reignition is the main reason for damage of the capacitor bank,so overvoltage of single-phase reignition and two-phase reignition are the emphases of prevention. 2. Analysis of the special working condition of the operating switch for capacitor bank is carried out. It indicates that the vacuum switching device is difficult to realize no-reignition under this operation condition, so it is more practical to adopt protection devices. 3. Analyses of protection effect of RC and MOA and their shortages are carried out. It shows that the two methods can only restrain effectively overvoltage caused by single-phase reignition, and they cannot protect the capacitor bank when reignition of two-phase occurs. 4. The operation principle of G-R damping device is analyzed and discussed emphatically.

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