Comprehensive evaluation method for anti-short-circuit capability of transformer

Abstract

The invention provides a comprehensive evaluation method for the anti-short-circuit capability of a transformer. The comprehensive evaluation method comprises the following steps: 1, collecting various parameters influencing the anti-short-circuit capability of the transformer; 2, establishing an analysis platform based on a mathematical model, and importing standard data; 3, comparing the detection data with the standard data; 4, obtaining required data by inquiring factory parameter data of a transformer under each operation unit and merging the factory parameter data; 5, calculating the short circuit resisting capability; 6, carrying out preliminary judgment according to a result obtained by calculation in the step 5; 7, taking a calculated short circuit current limit value as observation data through state evaluation; 8, according to the evaluation state and the actual operation condition of the transformer, enabling the field personnel to decide whether to give out early warning; and 9, entering an early warning processing flow. A traditional planned maintenance mode of the power grid equipment is converted into a more scientific stateful maintenance mode, the stability of safe operation of the power grid equipment is improved, and losses caused by accidents are reduced.

Description

technical field [0001] The present application relates to the technical field of transformer detection, in particular to a method for comprehensively evaluating the short-circuit resistance capability of transformers. Background technique [0002] When the transformer is suddenly short-circuited, a large short-circuit force will be generated in the winding, so the short-circuit resistance of the transformer is particularly important. If the design or technological measures of the transformer are not perfect, and the short-circuit resistance is not enough, the winding insulation and structural parts will be damaged, which will affect the insulation performance of the transformer. During the operation of the system, if a large-scale power transformer is damaged by a short circuit, it will cause a large-scale power outage, and the maintenance period will be more than half a year, causing great losses. In recent years, statistical analysis of power transformer accidents with vo...

AI Technical Summary

Problems solved by technology

If the design or technological measures of the transformer are not perfect, and the short-circuit resistance capability is not enough, the winding insulation and structural parts will be damaged, which will affect the insulation performance of the transformer.

During the operation of the system, if a large-scale power transformer is damaged by a short circuit, it will cause a large-scale power outage, and the maintenance period will be more than half a year, causing great losses

In recent years, the statistical analysis of accidents of power transformers with voltage levels of 110kV and above in the country shows that accidents caused by insufficient short-circuit resistance have become the primary cause of transformer accidents, seriously affecting the safe and reliable operation of transformers.

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