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Test device of crosslinking polyethylene-insulated cable material water treeing resistance performance

A technology of cross-linked polyethylene and test device, which is applied in the direction of testing dielectric strength, etc., can solve the problems of complex method and large sample volume, and achieve the effects of small sample volume, simple sample structure and simple production process.

Active Publication Date: 2011-01-26
ZHEJIANG WANMA MACROMOLECULE MATERIAL
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Problems solved by technology

However, ASTM D6097-97a proposes that the production method of the sample is complicated and the sample volume is huge; in addition, there is no 1kHz, 10kV high-frequency high-voltage power supply product in China

Method used

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  • Test device of crosslinking polyethylene-insulated cable material water treeing resistance performance
  • Test device of crosslinking polyethylene-insulated cable material water treeing resistance performance
  • Test device of crosslinking polyethylene-insulated cable material water treeing resistance performance

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Embodiment Construction

[0015] The test device of cross-linked polyethylene (XLPE) cable material water tree resistance performance of the present invention mainly comprises sample 10 and test circuit, and test circuit comprises adjustable DC power supply 40, drive circuit 30 of adjustable DC power supply, high frequency and high voltage generator Device 20, protection circuit 60 (ie sample breakdown protection circuit) and timing circuit 50 five parts.

[0016] Generally speaking, the water tree in the cable insulation grows in the place where the local electric field is concentrated such as impurities and micropores. Therefore, a water needle electrode with a needle tip curvature of micron scale is used to simulate the electric field concentration and accelerate the penetration of water. Put the XLPE material in a mold with hard metal needles, and form pinholes on the surface of the sample after hot pressing and cooling. The mold proposed by ASTM D6097-97a standard presses four test blocks at a tim...

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Abstract

The invention relates to a testing device used for testing the performance of crosslinked polyethylene, aiming at providing a testing device which can reliably measure and compare the water resistance tree with different compounding XLPE material; furthermore, the testing operation is simple and convenient, the testing sample has simple structure, and the testing sample has small volume; the technical proposal of the invention is that the testing device used for testing the performance of crosslinked polyethylene water resistance tree comprises a testing sample used for the water resistance tree, an adjustable high-frequency and high-voltage power and a protection timing circuit; the soleplate of the testing sample is an XLPE plate with a group of water needle holes prepared; the XLPE plate is made of the cable material to be measured, wherein, the water needle holes are formed during the plate preparing process; a section of polyethylene short pipe is bonded to the XLPE plate so as to form a container, thus facilitating the salt solution filling, wherein, the output of the adjustable high-frequency and high-voltage power is respectively connected with the electrode at the bottom of the testing sample and the electrode in the upper salt solution.

Description

technical field [0001] The invention relates to a test device for testing the performance of cross-linked polyethylene, especially a test device for comparing and evaluating the water-tree resistance performance of cross-linked polyethylene cable materials. Background technique [0002] The "water treeing" of the cable insulation layer is an important reason for the aging breakdown of XLPE cables and the reduction of service life. With the expansion of my country's industrial scale and the rapid increase of urban electricity consumption, the consumption of 10kV cross-linked polyethylene (XLPE) cables is increasing, and there are more and more accidents of cable insulation breakdown caused by water trees. The usual method to compare and evaluate the water tree resistance of XLPE cable materials is to use power frequency voltage, but the time for cultivating water trees is very long, which cannot meet the needs of rapid research. The American standard (ASTM D6097-97a) propose...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/12
Inventor 何军冯本青屠德民
Owner ZHEJIANG WANMA MACROMOLECULE MATERIAL
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