Capacitor voltage transformer internal insulation performance on-line diagnosis method and system

Abstract

The invention provides an online diagnosis method and system for the internal insulation performance of a capacitor voltage transformer, and the method comprises the steps: building a source domain data set and a target domain data set of a CVT diagnosis model, and determining the personalized features and common features in CVT data; according to a CVT internal insulation performance degradation mechanism, extracting related parameters of the internal insulation fault CVT as common characteristics; estimating a common feature distribution model through a Dirichlet process Gaussian mixture model; constructing an internal insulation fault virtual CVT generation model to generate an internal insulation fault virtual CVT sample; based on the number of normal-state CVT samples and the number of virtual CVT samples in a graph generator balance target domain, nodes on a balance network are distinguished through a training graph convolutional network recognizer, and a fault diagnosis model is obtained; and performing internal insulation fault diagnosis on the to-be-tested CVT sample through the fault diagnosis model. Through the scheme, the sample data demand can be reduced, the fault diagnosis model is constructed based on the generated virtual sample, and the recognition accuracy of the fault diagnosis model can be effectively guaranteed.

Description

technical field [0001] The invention belongs to the field of electric equipment state evaluation, and in particular relates to an on-line diagnosis method and system for the internal insulation performance of a capacitive voltage transformer. Background technique [0002] Compared with the traditional electromagnetic transformer, CVT (capacitive voltage transformer) has the characteristics of strong anti-ferromagnetic resonance, low manufacturing cost, small size and light weight, so it is widely used in high-voltage lines of 110kV and above. However, due to the complex internal structure of the CVT, the operating state is easily affected by environmental factors, and abnormal conditions such as error out-of-tolerance and insulation performance degradation are prone to occur during long-term operation, thereby affecting the accuracy of electric energy measurement and the safety of the power system. [0003] For the internal insulation performance analysis of CVT, there are m...

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Problems solved by technology

[0004] In view of this, the embodiment of the present invention provides an online diagnosis method and system for the internal insulation performance of a capacitive voltage transformer, which is used to solve the problem that the existing CVT internal insulation fault diagnosis method needs fault sample data, and it is difficult to construct a diagnosis with higher accuracy. model problem

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