Method and device for constructing insulation fault identification model of voltage transformer

Abstract

The invention relates to a method and device for constructing an insulation fault identification model of a voltage transformer, and the method comprises the steps: collecting the secondary voltage data of a voltage transformer in an insulation fault simulation experiment, and constructing an insulation fault experiment data set; performing feature extraction on the insulation fault experiment data set by using a consistent relationship of primary voltages of a plurality of voltage transformers in the same phase, eliminating the influence of primary voltage fluctuation, and obtaining a laboratory fault feature data set by using a principal component analysis method; training the laboratory fault feature data set by using a supervised learning algorithm to obtain a fault identification model; and finally, migrating the fault identification model to an actual substation working condition by using a transfer learning algorithm to obtain an improved fault identification model. Through the fault identification model constructed by the invention, the insulation state of the voltage transformer can be monitored on line in real time without power-off maintenance, the operation state of the voltage transformer can be mastered in real time, and the risk that the fault voltage transformer serves an electric power system is reduced.

Description

technical field [0001] The invention relates to the technical field of electric equipment state evaluation methods, in particular to a method and device for building a voltage transformer insulation fault identification model. Background technique [0002] Voltage transformer is one of the key basic equipment widely used in power system for electrical data acquisition, including electromagnetic voltage transformer, capacitive voltage transformer and electronic voltage transformer. [0003] Potential transformers are susceptible to degradation due to external environmental factors during operation, which in turn affects the accuracy of electrical data measurement, and even affects the accurate action of relay protection in severe cases, threatening the safe and stable operation of the power system. Therefore, it is very important to monitor the operating status of voltage transformers and maintain faulty voltage transformers in time to ensure that their operating status compl...

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Problems solved by technology

Therefore, the prerequisite for implementing the above method is to re-simulate the fault experiment on the voltage transformer at the substation site. Since the substation site does not have the conditions for fault simulation experiments, the practical applicability of the above method is limited.

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