Transformer iron core multipoint grounding diagnosis and processing method

Abstract

The invention relates to a transformer iron core multipoint grounding diagnosis and processing method. The transformer iron core multipoint grounding diagnosis and processing method is technically characterized by comprising the steps of measuring grounding current of a transformer iron core, checking whether a measuring method is correct or not and performing re-measurement if the grounding current exceeds standard, making a definite diagnosis on failure cause through oil chromatography testing and grounding current change, taking a series resistance or large current impact treatment measure if re-measurement is abnormal, and timely arranging major repair according to a transformer operation state under the necessary situation. The transformer iron core multipoint grounding diagnosis and processing method is reasonable in design, and the problems of accurate judgment and quick processing after multiple-point grounding of a transformer occurs are solved. The analysis time of technicians is remarkably reduced, the accuracy of an analysis conclusion and timeliness of problem handling are improved, safe and stable operation of the transformer and a power grid is ensured, and operation reliability of the power grid is ensured.

Description

technical field [0001] The invention belongs to the technical field of transformers, in particular to a method for diagnosing and processing transformer iron core multi-point grounding. Background technique [0002] The iron core of the transformer in normal operation should be grounded at one point. However, if a metal foreign object falls into the oil tank, it will make the connection between the iron core laminations and the box body; Circulating currents in the iron core grounding wires occur from time to time during transformer operation due to hardware and other reasons. According to statistics, the iron core grounding fault ranks third in the transformer faults, accounting for more than 30% of the total transformer faults. Based on the above reasons, in the latest version of the 18 countermeasures of the State Grid Corporation of China, it is proposed that abnormal changes in the circulating current should be paid attention to during the operation of the transformer....

AI Technical Summary

Problems solved by technology

[0002] The iron core of the transformer in normal operation should be grounded at one point. However, if a metal foreign object falls into the oil tank, it will make the connection between the iron core laminations and the box body; Circulating current in the iron core grounding wire occurs from time to time during the operation of the transformer

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