Power cable intermediate joint insulation detection method based on dielectric spectrum method

A technology for power cables and intermediate joints is applied in the field of insulation testing of intermediate joints of power cables, which can solve the problems of accelerated insulation aging, deterioration, performance failure, interface structure defects, etc., to achieve accurate test results, ensure safe and stable operation, and reduce power grid accidents. the effect of risk

Pending Publication Date: 2020-06-16
国网山东省电力公司聊城供电公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The cable joint is a multi-layer solid composite dielectric insulation structure, uneven electric field distribution along the surface, interface structure defects, and local field strength concentration will accelerate insulation aging, deterioration and performance failure

Method used

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  • Power cable intermediate joint insulation detection method based on dielectric spectrum method
  • Power cable intermediate joint insulation detection method based on dielectric spectrum method
  • Power cable intermediate joint insulation detection method based on dielectric spectrum method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0077] Using the method of the present invention to evaluate the insulation life of the prefabricated silicone rubber power cable intermediate joints in service for 5 years is as follows.

[0078] Step 1001, take the insulation layer of the prefabricated silicone rubber cable intermediate joint that has not been in service and has been in service for 5 years, and cut it into test pieces with a thickness of 1mm, wipe the surface clean and dry, and set aside.

[0079] Step 1002, cutting the tested test piece into a circular test piece with a diameter of 30 mm and a thickness of 1 mm as a sample.

[0080] Step 1003, using the Novocontrol Concept 80 test system, the spectrum and temperature spectrum test of the broadband dielectric spectrum is carried out on the sample, and the test frequency range is 10 -1 ~10 6 Hz, and the temperature is 40°C to 90°C.

[0081] Step 1004, use origin to process the tested dielectric constant data, and draw the relative dielectric constant ε of t...

Embodiment 2

[0089] Using the method of the present invention to evaluate the insulation life of the prefabricated silicone rubber power cable intermediate joints in service for 8 years is as follows.

[0090] Step 1001, take the insulation layer of the prefabricated silicone rubber cable intermediate joint that has been in service for 8 years, cut it into test pieces with a thickness of 1mm, wipe the surface clean and dry, and set aside.

[0091] Step 1002, cutting the tested test piece into a circular test piece with a diameter of 30 mm and a thickness of 1 mm as a sample.

[0092] Step 1003, using the Novocontrol Concept 80 test system, the spectrum and temperature spectrum test of the broadband dielectric spectrum is carried out on the sample, and the test frequency range is 10 -1 ~10 6 Hz, and the temperature is 40°C to 90°C.

[0093] Step 1004, use origin to process the data of the tested dielectric constant, and draw the relative dielectric constant ε of the sample that has been i...

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Abstract

The invention discloses a power cable intermediate joint insulation detection method based on a dielectric spectrum method. The method comprises the following steps of preprocessing a power cable intermediate joint insulation layer and preparing a sample, performing broadband dielectric spectrum test on the sample, processing the test data to obtain a spectrogram of the dielectric constant changing along with temperature and frequency, obtaining a spectrogram of dielectric loss angle tangent changing along with temperature and frequency, drawing a dielectric temperature spectrum and a dielectric frequency spectrum of the same sample, formulating a rule for judging insulation aging and degradation states of the silicone rubber by the dielectric spectrum, and comparing the dielectric constants/dielectric loss angle tangent of the same sample at different temperatures, and judging the insulation life of the intermediate joint of the power cable by adopting a rule. The aging and degradation states of the silicone rubber insulation in different stages in the service process can be detected, and whether the insulation is degraded or not is judged according to the change trend of the relative dielectric constant and the dielectric loss angle tangent.

Description

technical field [0001] The invention relates to a dielectric spectrum method for detecting the insulation of an intermediate joint of a power cable, belonging to the technical field of power cable detection. Background technique [0002] The main cause of power equipment failure is the aging, deterioration and failure of insulation performance, so the vast majority of power equipment failures are ultimately attributed to insulation failures. Cross-linked polyethylene (XLPE) insulated cables are widely used for their superior electrical properties (high permissible core temperature, small dielectric loss, high electrical strength), high and low temperature resistance, environmental stress crack resistance and laying, and easy operation and maintenance. It is applied to power transmission and distribution lines in the fields of smart grid, rail transit, marine engineering equipment and new energy. [0003] The cable intermediate joint is an important part of the transmission ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/12
CPCG01R31/1272
Inventor 胡晓东渠志江李永旭邵光磊秦福宁赵金辉李正甄志辉侯迪李先栋
Owner 国网山东省电力公司聊城供电公司
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