Testing method for on-line testing transformer internal insulating hidden trouble

A technology of internal insulation and testing methods, applied in the direction of measuring electrical variables, instruments, measuring electricity, etc.

Inactive Publication Date: 2004-12-08
TBEA HENGYANG TRANSFORMERS
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  • Abstract
  • Description
  • Claims
  • Application Information

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  • Testing method for on-line testing transformer internal insulating hidden trouble
  • Testing method for on-line testing transformer internal insulating hidden trouble

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Embodiment Construction

[0013] As shown in the accompanying drawing, a new type of testing method for on-line detection of hidden dangers in the transformer’s internal insulation is to use high and medium voltage bushings 2, neutral point bushings 3, and iron core grounding sleeves from transformer 1 during the operation of the transformer. A sensor K that can respond to transient signals is used at the ports of the pipe 4 1 、K 2 、K 3 、K 4 、K 5 、K 6 To collect non-power frequency signals, and according to the collected signal waveform, amplitude, and time changes, in conjunction with other parameter changes, to analyze and judge the degree of damage to the main and cluster insulation inside the transformer.

[0014] In terms of signal acquisition, capacitive voltage division method, resistive voltage division method or electromagnetic induction method can be used to collect non power frequency signal.

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Abstract

In the method, non-power frequency is collected by transducer being able to respond transient signal from ports of iron core earthing sleeve, neutral point sleeve and medium voltage sleeve of transformer in operation procedure of the transformer and damage degree of main and slave insulation in transformer internal is judged and analysed based on variation state of collected signal waveform, amplitude value and time coordinating with other paraters changing. The present invention can make on line monitoring to transient heat and electricity causing harm to transformer insulation.

Description

technical field [0001] The invention relates to a method for online detection of hidden dangers of insulation inside transformers, in particular a novel testing method suitable for on-line detection of hidden dangers of insulation inside transformers for main transformer equipment in 110kV-750kV substations of electric power systems. Background technique [0002] At present, domestic and foreign researches on transformer insulation on-line monitoring have been carried out for many years, and people have developed many products, such as on-line capacitive equipment insulation monitoring, on-line oil chromatography monitoring, on-line partial discharge monitoring, on-line oil micro-water monitoring, etc. By monitoring various parameters in the operation of the transformer, the early latent faults of the transformer are analyzed to determine whether the operation status of the transformer is normal. However, the methods that have been adopted at present ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/00G01R31/06
Inventor 魏铁军欧阳南尼
Owner TBEA HENGYANG TRANSFORMERS
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