High-voltage power transformer short-circuit fault prediction method, prediction device and defense method

Abstract

The invention provides a prediction method, a prediction device, and a defense method for a short circuit fault of a high-voltage power transformer. The prediction method for the short-circuit fault of the high-voltage power transformer comprises the steps of acquiring trip short-circuit current of the high-voltage power transformer to be predicted, and obtaining a lightning stroke power transmission line structure model by using electromagnetic transitory simulation software, wherein, the lightning stroke power transmission line structure model comprises a high-voltage power transformer model and a pole tower model; executing lightning stroke test simulation on the pole tower model by using the electromagnetic transitory simulation software, and acquiring lightning stroke short-circuit current generated by the pole tower model during the simulation; comparing the lightning stroke short-circuit current with the trip short-circuit current, and acquiring, according to the compared result, a trip frequency at which lightning stroke trip occurs to the high-voltage power transformer in actual operation thereof; and acquiring, according to the trip frequency, a probability at which the short-circuit fault occurs to the high-voltage power transformer in the case that the high-voltage power transformer is struck by lightning. The above prediction method for the short-circuit fault of the high-voltage power transformer can predict the short-circuit fault of the high-voltage power transformer with higher accuracy.

Description

technical field [0001] The invention relates to electric power engineering technology, in particular to a high-voltage power transformer short-circuit fault prediction method, a high-voltage power transformer short-circuit fault prediction device and a high-voltage power transformer short-circuit fault prevention method. Background technique [0002] In recent years, the power grid often has high-voltage power transformers, such as compact transformers, which cause transformer tripping failures caused by the heavy gas protection of the body, which seriously affects the reliable operation of the power system and user power supply. The main reason for the misoperation of the heavy gas protection of the high-voltage power transformer is the transient impact of the power grid (sudden short circuit). In the operation of high-voltage transmission lines, the tripping accidents caused by the transient impact of lightning strikes account for 40% to 70% of the total tripping accidents...

AI Technical Summary

Problems solved by technology

[0005] Based on this, it is necessary to provide a high-voltage power transformer short-circuit fault prediction method, a high-voltage power transformer short-circuit fault prediction device, and a high-voltage power transformer short-circuit fault prediction method to solve the problem that the existing prediction methods have low prediction accuracy for high-voltage power transformer short-circuit faults. defense method

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