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

A transformer clamp, multi-point grounding technology, applied in transformer testing, instruments, measuring devices, etc., to achieve the effect of wide applicability, improve decision-making efficiency and judgment accuracy, and ensure safe operation

Inactive Publication Date: 2019-03-29
GUANGXI POWER GRID ELECTRIC POWER RES INST
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  • Abstract
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  • Claims
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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

Method used

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

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[0018] The specific implementation of the present invention will be described below in conjunction with the drawings.

[0019] Such as figure 1 As shown, the multi-point grounding fault judgment and treatment method of large transformer clamps mainly includes the following steps:

[0020] Step 1: Detect that the current of the grounding lead of the transformer clamp exceeds the requirements of the regulations (for example, the Southern Power Grid regulations require a caution value of 100mA), and the operation and maintenance personnel should pay attention and start to judge and handle.

[0021] The current detection of the ground lead of the transformer clamp is suitable for transformers whose clamps are led out through the grounding bushing alone. At present, most of the transformers of 110kV and above in China Southern Power Grid are of this type. When using a closed current clamp meter to measure the ground lead current, in order to avoid interference from space leakage and redu...

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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...

Claims

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Application Information

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IPC IPC(8): G01R31/02G01R19/165G01N30/02G01R31/12G01R27/02
CPCG01N30/02G01R19/16571G01R27/025G01R31/12G01R31/62
Inventor 颜海俊张玉波张磊黎大健余长厅
Owner GUANGXI POWER GRID ELECTRIC POWER RES INST
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