Test method and apparatus for polymer power cable insulation accelerated electric tree aging

A power cable and test device technology, which is applied in the field of insulation monitoring of polymer power cables, can solve the problems of large consumables, inability to estimate cables, long aging time, etc.

Inactive Publication Date: 2011-06-08
CHONGQING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The test system is quite different from the actual operating conditions of the polymer power cable, and it is impossible to estimate the influence of the inner and outer semiconductor shielding layers of the cable.
The other is based on the aging test of the finished polymer insulated cable, that is, the product test of the manufacturer. This method is very close to the aging process of the actual running cable, but it is difficult to achieve accelerated aging, the aging time is long, and the test operation is complicated. Consumables Large, requires a large test site, and the economic demand is huge

Method used

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  • Test method and apparatus for polymer power cable insulation accelerated electric tree aging
  • Test method and apparatus for polymer power cable insulation accelerated electric tree aging
  • Test method and apparatus for polymer power cable insulation accelerated electric tree aging

Examples

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Effect test

Embodiment 1

[0065] Such as Figure 1~4 As shown, a test device for accelerated electrical tree aging of polymer power cable insulation, including a non-halo experimental transformer 1, an induction voltage regulator 2, a capacitive voltage divider 3, a test electrode 4, a broadband current sensor 5, and an amplification filter 6. Digital oscilloscope 7. Microcomputer 8. The test electrode 4 is mainly composed of a glass fiber reinforced plastic shell 10, an anti-corona cover 11, a round electrode 12, a cylindrical copper electrode 13, a compression nut 14, a cable sample 15, a terminal clamp 16, a ground connection 17, an insulating oil 18, and an oil drain. Valve 19, insulating bracket 20, post insulator 21 and metal disc base 22 are composed. A top cover is set on the upper end surface of the FRP shell 10, so that the test electrode 4 and insulating oil 18 are injected, and cylindrical copper electrodes are respectively installed at both ends of the center of the FRP shell 10. At both...

Embodiment 2

[0067] A test method for accelerated electrical tree aging of polymer power cable insulation, the specific steps are as follows:

[0068] 1) Test preparation

[0069] First cut a section of the polymer power cable, peel off both ends layer by layer, and artificially create a defect 28 on the insulating layer 25 in the center of the cable sample 15, and make a cable sample 15 with the insulation defect 28. First, connect the cable cores 23 at both ends of the cable sample 15 to the two cylindrical copper electrodes 12 of the test electrode 4 through the compression nuts 14 of the test electrode 4, respectively, and connect the copper shielding layer 27 of the cable sample 15 to the ground. The ground connection line 29 is connected with the end of the oil discharge valve 19 in the pressure electrode, and then the electrode system 4 is placed in the combined electric heating aging box 9, and the end of the oil discharge valve 19 outside the test electrode is connected with the g...

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Abstract

The invention provides a polymer power cable insulation acceleration electrical tree aging test method and a device, which relate to a testing device for monitoring polymer power cable insulation electrical tree aging and a method thereof. The device provided by the invention comprises a non-vignetting testing transformer, an induction voltage regulator, a capacitance voltage divider, a testing electrode, a broad band current sensor, an amplification filter, a digital oscillograph, a microcomputer and an electrothermal combined aging oven. The method provided by the invention comprises the following steps: the testing preparation is carried out with the device provided by the invention; a test sample is subjected to local discharge data acquisition and processing through a program; and the image and the basic data of the insulation electrical tree branching of the test sample are obtained through slicing and photographing. The device provided by the invention has the advantages of high pressure resistance and heat resistance level, small amount of self-local discharge, and safe and reliable use. The method provided by the invention has the characteristics of convenient and accurate use, and the like. The invention can be widely applied to the field of monitoring the insulation aging of a power cable, in particular to the field of monitoring the insulation electrical tree agingof a polymer power cable.

Description

technical field [0001] The invention belongs to the technical field of insulation monitoring of polymer power cables, and in particular relates to a test method and a device for monitoring the aging of insulation trees of polymer power cables. Background technique [0002] Polymer insulated power cables, especially cross-linked polyethylene (XLPE) cables, are widely used in power systems due to their superior electrical, mechanical, and mechanical properties. Under the multiple stresses of electricity, heat, machinery, water humidity and environmental stress, the insulation of polymer power cables will appear in the aging form of water branches and electric branches, which will eventually be attributed to electric branches and lead to insulation breakdown. Because electrical dendification is the bottleneck of long-term safe operation of polymer power cables, which affects the safe and reliable operation of power systems, the research on its dendrite characteristics has attra...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N1/28G01N21/84G01R31/12
Inventor 周湶廖瑞金杨丽君杜林张晓星李剑孙才新刘玲叶笛
Owner CHONGQING UNIV
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