Analysis of methods for monitoring the technical condition of high-voltage electronic measuring transformers

The objectives of the present study included an analysis of statistical data on the failure causes of highvoltage equipment with a particular focus on current and voltage measuring transformers; a study of factors affecting the technical and functional condition of measuring transformers; a review of available methods for monitoring the technical condition of high-voltage electronic measuring transformers; the development of the basic principles of a stationary system for monitoring the technical capabilities of electronic measuring transformers. A review of available scientific publications and copyright objects on the aforementioned problems was conducted. The results were processed using the principles of systematic approach, as well as induction, deduction, classification and abstraction methods. The existing methods for monitoring the technical condition of high-voltage electronic measuring transformers were analyzed. The influence of various regimes and external factors on the technical and functional state of measuring transformers was investigated. The main principles for developing a stationary system for monitoring the technical condition of electronic measuring transformers were formulated. It was established that the failure of measuring transformers in medium voltage networks accounts for 6% of all failures. In 110 kV and higher-voltage networks, this level reaches 7%. It was found that the majority of accidents is associated with damaged insulation, poor-quality manufacturing and installation of the equipment, the impact of operating parameters and external factors on the technical and functional state of measuring transformers. Based on the considered methods for monitoring the technical condition of high-voltage equipment, a functional scheme of a stationary system for monitoring the technical capabilities of electronic measuring transformers at a digital substation is proposed.

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