Multi-point ground fault diagnosis and disposal method for clamp of large transformer

Abstract

The invention relates to a multi-point ground fault diagnosis and disposal method for a clamp of a large transformer. A frame-type technical scheme is adopted for how to carry out multi-point ground fault diagnosis and disposal of the clamp when the ground current of the clamp of the transformer exceeds a regulation. The method comprises the steps that when the fact that the ground lead current ofthe transformer clamp exceeds the requirement of the regulation is detected, diagnosis and disposal are started; a measurement period is shortened, and periodic ground current measuring of the clampis continuously carried out; if the ground current of the clamp seriously exceeds the standard or maintains a high level, oil chromatographic test analysis and inference are carried out; and accordingto the condition of oil chromatographic test analysis, power outage disposal or temporary disposal without power outage is arranged, or further manhole inspection or lifting hood inspection is arranged. The method provided by the invention is clear and systematic, has a wide application scope, greatly improves the decision-making efficiency and judgment accuracy of electric power operation and maintenance personnel, helps to prevent the deterioration of the multi-point ground fault of the clamp, and ensures safe and stable operation of the transformer.

Description

technical field [0001] The invention relates to the technical field of electric power safety, in particular to a method for judging and treating multi-point grounding faults of large-scale transformer clips. Background technique [0002] Under normal operating conditions, the clamps of power transformers should have only one point of grounding, but in the process of transportation, installation, maintenance and long-term operation, multi-point grounding often occurs. Multi-point grounding of clamps will cause potential differences in the magnetic field at different grounding points, resulting in circulating currents, which may cause local overheating and cause the transformer oil to decompose and release a large amount of faulty gas. In the case of heavy load on the transformer, the circulating current in the clamps of the transformer with multi-point grounding operation increases significantly, and the local heating degree of the abnormal grounding points of the clamps inte...

AI Technical Summary

Problems solved by technology

[0003] Aiming at some of the above problems, the present invention provides a method for judging and handling multi-point grounding faults of large-scale transformer clamps, which is used to solve the problem of judging and handling multi-point grounding faults of clamps when the grounding current of the transformer is too large.

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