Comprehensive evaluation analysis method for power transformer short-circuiting resistance

Abstract

Disclosed is a comprehensive evaluation analysis method for power transformer short-circuiting resistance. The method includes the following steps that 1, short-circuit currents when various external short circuits happen to a power transformer can be calculated according to relevant parameters of the power transformer and an impedance network analysis method, and the short circuits include symmetrical short circuits and asymmetrical short circuits; 2, calculated values of the short-circuit currents are compared with the maximum short-circuit current value which is allowed by the power transformer to obtain a transformer short-circuiting resistance evaluating result A based on the short-circuit currents; etc. By means of the comprehensive evaluation analysis method for the power transformer short-circuiting resistance, problems which happen to mechanical test methods based on short-circuiting electrodynamic force which is obtained through an empirical formula in terms of traditional evaluation of power transformer short-circuiting resistance can be solved, traditional methods are combined with an electromagnetism method based on the short-circuit currents on the original basis, and the evaluation method is quite reasonable and effective.

Description

technical field [0001] The invention belongs to the technical field of transformers, and more specifically relates to a method for evaluating short-circuit resistance capability of power transformers. Background technique [0002] The power transformer is an important equipment in the power grid, and the stable and reliable operation of the transformer plays a very important role in the safety of the power grid. In recent years, accidents caused by insufficient short-circuit strength have become the primary cause of power transformer accidents, seriously affecting the safe and reliable operation of power transformers. Short-circuit damage has become the primary cause of transformer accidents, which has a serious impact on the power system and causes huge economic losses. [0003] Recently, domestic provincial network companies are carrying out work related to the evaluation of transformer short-circuit resistance capability. The evaluation of the short-circuit resistance c...

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Problems solved by technology

In recent years, accidents caused by insufficient short-circuit resistance have become the primary cause of power transformer accidents, seriously affecting the safe and reliable ...

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