Method for processing on-site reasons of dielectric loss value abnormity of oil-paper insulated capacitive bushing

A bushing dielectric loss and oil-paper insulation technology, which is applied in the electric power field, can solve problems such as bushing external insulation and internal insulation defects, and achieve the effects of wide applicability, ensuring safe operation, and improving decision-making efficiency and judgment accuracy

Active Publication Date: 2021-05-14
GUANGXI POWER GRID ELECTRIC POWER RES INST
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to at least solve the technical problems existing in the prior art, and provide a method for dealing with the abnormal on-site cause of the dielectric loss value of the oil-paper insulated capacitor type bushing, It is used to solve the on-site cause judgment and disposal of defects in the outer insulation and inner insulation of the bushing when the dielectric loss test of the oil-paper insulating capacitor type bushing is too large

Method used

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  • Method for processing on-site reasons of dielectric loss value abnormity of oil-paper insulated capacitive bushing

Examples

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Embodiment 1

[0025] Such as figure 1 The flow chart of the method for handling the abnormal on-site cause of the dielectric loss value of the oil-paper insulating capacitor type bushing shown mainly includes the following steps:

[0026] Step 1: Carry out the dielectric loss test of the casing, and if it exceeds the value required by the regulations, the operation and maintenance personnel will start to judge and deal with it;

[0027] Step 2: Use the equipotential shielding ring method to retest the dielectric loss value, and determine whether the dielectric loss value exceeds the standard is caused by the internal insulation or external insulation of the bushing;

[0028] Step 3: Carry out external insulation treatment measures or internal insulation treatment measures according to the analysis of the test results in step 2: Among them, the external insulation treatment measures are as follows: the first choice is to use the external insulation shed skirt to spray, rinse and wipe clean, ...

Embodiment 2

[0040] Such as figure 1 The flow chart of the method for handling the abnormal on-site cause of the dielectric loss value of the oil-paper insulating capacitor type bushing shown mainly includes the following steps:

[0041] Step 1: Carry out the dielectric loss test of oil-paper insulating capacitor type bushings, and check whether the results meet the requirements of relevant regulations (for example, at 20°C, the values ​​required by the Southern Power Network Regulations are not more than 0.8% for 110kV-220kV bushings, and not more than 0.6% for 500kV bushings) , if the value exceeds the requirements of the regulations, it should be brought to the attention of the operation and maintenance personnel and start to judge and deal with it. When carrying out the dielectric loss test of the bushing, the positive connection test method of pressurizing the conductive end at the top of the bushing and measuring the terminal of the last screen should be adopted, and a test voltage o...

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Abstract

The invention discloses a method for processing on-site reasons for dielectric loss value abnormity of an oil-paper insulated capacitive bushing, which comprises the following steps of: carrying out a bushing dielectric loss test, and if a regulation required value is exceeded, starting judgment and disposal by operation and maintenance personnel; adopting an equipotential shielding ring method to retest the dielectric loss value, and judging whether the dielectric loss value exceeds the standard or is caused by the internal insulation or external insulation factor of the sleeve; carrying out external insulation treatment measures or internal insulation treatment measures according to the analysis condition of the retest result of the equipotential shielding ring method; for the external insulation defect, washing and wiping clean the external insulation umbrella skirt by water spraying, and additionally arranging an auxiliary umbrella skirt when necessary; for the internal insulation defect, further judging the serious condition of the internal insulation defect according to the frequency domain dielectric spectrum test and the insulating oil test result, and replacing the sleeve treatment mode. The method is beneficial to timely analysis of the abnormal reason of the dielectric loss of the bushing, accurate judgment of the state of the bushing and effective processing of faults, and prevents defect deterioration, thereby guaranteeing the safe operation of the transformer bushing.

Description

technical field [0001] The invention relates to the field of electric power technology, in particular to a method for dealing with on-site causes of abnormal dielectric loss values ​​of oil-paper insulating capacitor type bushings. Background technique [0002] The oil-paper insulated capacitive bushing is one of the key external components of a power transformer, and its health status will have an important impact on the stable operation of the transformer. In recent years, transformer accidents caused by the defects of oil-paper insulating capacitor bushings are not uncommon, ranging from tripping due to transformer faults, to causing fires and explosions in severe cases. Failure to detect and deal with the hidden dangers of bushing defects in time will be detrimental to the operation of the transformer maintain. Dielectric loss test is the most common preventive test item for oil-paper insulated capacitive bushing, and the test value can directly reflect the operation st...

Claims

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Application Information

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IPC IPC(8): G01R27/26G01N30/02G01D21/02
CPCG01R27/2694G01N30/02G01D21/02
Inventor 颜海俊张玉波黎大健张磊焦健
Owner GUANGXI POWER GRID ELECTRIC POWER RES INST
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