Analysis of the Impact of Microbial Degradation on the Insulation System of the Offline Capacitive Voltage Transformer

doi:10.11930/j.issn.1004-9649.201611028

Abstract

Abstract: To improve the safety of the capacitor voltage transformer (CVT) operation, it is necessary to study why the amount of the gas contents such as CH₄, H₂ and CO₂ in the oil-paper insulation system of the offline CVT increases. The microorganism growing experiment in the oil-paper insulation system of the CVT is conducted by using the methods of natural inoculation, artificial inoculation and high-temperature sterilization. The microbial degradation products and their amounts are determined with the gas chromatograph, the micro water detector and some other equipments. The microorganism species are identified with the molecular biological method, and the degradation characteristics of the insulation system are analyzed. The results show that the H₂O, acids, CH₄, H₂, and CO₂ are produced during the microbial degradation in the oil-paper insulation system and the components are the same as those found in in the insulating oil of the offline CVT Also, an inflection point of decrease is observed in the gas component increasing process. Four spherical anaerobic microorganism species are detected by microscopic observation and biological identification. It is concluded that the bio-degradation of the oil-paper insulation system of the CVT has two stages, the multi-microbial degradation and anaerobic methane fermentation. The CH₄, H₂ and CO₂ are the characteristic gas produced from the degradation.

Key words: CVT, insulating oil, insulating paper, microorganisms, degradation

CLC Number:

TM451⁺.2

WANG Jie, SU Changhua, WU Xiaohui, ZHANG Li, HU Shihong, LAN Xinsheng. Analysis of the Impact of Microbial Degradation on the Insulation System of the Offline Capacitive Voltage Transformer[J]. Electric Power, 2018, 51(4): 61-66.

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URL: https://www.electricpower.com.cn/EN/10.11930/j.issn.1004-9649.201611028

https://www.electricpower.com.cn/EN/Y2018/V51/I4/61

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