油纸绝缘气隙放电发展能量熵特征研究

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Abstract Oil-immersed paper insulation is one of the important structures in transformer insulation system, and air-gap discharge is the primary form of partial discharge (PD) in oil-immersed paper. Thus, it is of great significance to study the new features of PD development process for detecting degradation states of insulation and potential faults. This paper builds an air-gap model in a simulative transformer tank to collect PD signals based on constant voltage method. According to the energy distribution singularities of PD signals caused by the variations of different degradation states, an energy entropy model is built based on energy distributions in different frequency bands. The new PD parameter, i.e. energy entropy, is put forward to reflect PD development process. Then each step change of energy entropy corresponds to the transformation of different degradation states, which was validated effectively through experiments. It provides a new idea to study the development characteristics of oil-paper insulation air-gap discharge.

Key words： Air-gap discharge insulation degradation energy distribution energy entropy

Received: 20 October 2014 Published: 12 July 2016

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