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Direct-current integral charge measuring device and method for high-voltage cable

A technology of high-voltage cables and measurement methods, which is applied in the direction of measuring devices, measuring electricity, and measuring electrical variables, etc., can solve problems such as quantitative analysis, and achieve the effects of easy operation, short measurement time, and powerful display functions

Pending Publication Date: 2021-07-13
泰兴市安能电力工程有限公司
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  • Abstract
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Problems solved by technology

[0003] At present, the life of cables with insulating materials is mostly based on qualitative analysis, and quantitative analysis has not been carried out effectively

Method used

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  • Direct-current integral charge measuring device and method for high-voltage cable
  • Direct-current integral charge measuring device and method for high-voltage cable

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Embodiment Construction

[0031] The present invention will be further described in detail below through the specific examples, the following examples are only descriptive, not restrictive, and cannot limit the protection scope of the present invention with this.

[0032] A DC integral charge measurement device for high-voltage cables, the innovation of which is that it includes a cable core 7, a cable shielding layer 6, a DC stabilized power supply 8, a picoammeter protection module 3 and a digital picoammeter 5. A cable shielding layer is arranged outside the cable core, the DC stabilized power supply is connected to the cable core, the cable shielding layer is connected to the digital picoammeter through a picoammeter protection module, and the DC stabilized voltage supply is connected to the digital picoammeter. The power supply, the picoammeter protection module and the digital picoammeter are all connected to the ground electrode 9, and the cable core is provided with a needle electrode.

[0033]...

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PUM

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Abstract

The invention relates to a direct-current integral charge measuring device and method for a high-voltage cable, a wire core of a measured cable sample is connected to a direct-current stabilized power supply, a shielding layer of the cable is connected to a digital picoammeter for integral measurement of charges, and the direct-current integral charge of the cable can be accurately measured. Meanwhile, the measurement process of the direct-current integral charge is displayed, the cable at different electrical tree stages is measured according to the process, the Labview software is used for performing least square fitting on the measured value, and the slope of the fitted curve corresponds to the size of the insulation leakage current in the cable. An insulation state evaluation method provided by the invention can be used for cables in different degradation stages, and lays an experimental foundation for research on quantitative evaluation of the aging state of the electrical tree.

Description

technical field [0001] The invention belongs to the technical field of electrical equipment insulation, and in particular relates to a DC integral charge measuring device and method for high-voltage cables. Background technique [0002] Insulating materials will be affected by multiple stresses such as electricity, heat, and mechanical forces during operation, and will age, resulting in a decline in insulation performance and eventually breakdown. The aging of insulation is inevitable, and it is still a huge challenge to achieve rapid and non-destructive testing of the aging state of insulation. Solving this problem is an urgent need for future industry development. [0003] At present, the life of cables with insulating materials is mostly based on qualitative analysis, and quantitative analysis cannot be carried out effectively. Contents of the invention [0004] The purpose of the present invention is to overcome the deficiencies of the prior art and provide a DC integ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R29/24G01R31/12
CPCG01R29/24G01R31/1272
Inventor 张新军王如山顾文权吴奇李巍
Owner 泰兴市安能电力工程有限公司
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