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Aging sensor based on conductive composite material and manufacturing method of aging sensor

The technology of a conductive composite material and a manufacturing method, applied in the field of sensors, can solve the problems of high monitoring cost, inability to realize real-time in-situ monitoring, time-consuming and labor-intensive, etc., and achieve the effect of reducing monitoring investment.

Inactive Publication Date: 2020-07-03
ELECTRIC POWER RES INST OF STATE GRID ZHEJIANG ELECTRIC POWER COMAPNY +2
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, some existing methods generally use regular power outages, and then monitor the cable to be tested, which cannot realize real-time in-situ monitoring, and most of the methods need to destroy the cable, take samples back to the laboratory for monitoring, or require complex electrical instruments and Specially trained personnel to measure, time-consuming and labor-intensive, high monitoring costs

Method used

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  • Aging sensor based on conductive composite material and manufacturing method of aging sensor
  • Aging sensor based on conductive composite material and manufacturing method of aging sensor
  • Aging sensor based on conductive composite material and manufacturing method of aging sensor

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Embodiment 1

[0055] An EPDM resin for wire and cable was chosen as the polymer matrix for sensor fabrication. Antioxidants are removed from virgin EPDM resins, eliminating the latent period of aging. Carbot XC-72 carbon black was used as a conductive filler with a filler content of 35wt.%. Dicumyl peroxide is a crosslinking agent, and its content is between 1wt% and 2wt%. The filler and polymer matrix are mixed in a three-roll mill. In order to obtain the best dispersion effect of the filler, it needs to be mixed and stirred 100 times. The resulting homogeneous mixture was transferred into a Teflon mold, and the resulting EPDM composite was cured by hot pressing at 150 °C for 1 hour. The sample thickness was kept at about 300 μm to mitigate diffusion limited oxidation effects. The sensor was tested at three different aging temperatures to monitor its resistivity and tensile elongation at break as a function of aging time.

[0056] For the convenience of the product aging test, no anti...

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Abstract

The invention relates to a manufacturing method of an aging sensor based on a conductive composite material. The manufacturing method provided by the invention comprises the steps of 1) mechanically stirring and mixing the same kind of insulating resin as a monitored cable insulating material, a conductive filler and an auxiliary agent under a heating condition to obtain a uniform solid mixture, wherein the temperature adopted by the heating condition is lower than the crosslinking temperature of the insulating resin; and 2) carrying out hot press molding on the uniform solid mixture to obtainthe aging sensor based on the conductive composite material. The aging sensor manufactured according to the invention can monitor the aging condition in real time through the change of the resistivity of the sensor, does not need to destroy sample sampling or power-off test, and can realize nondestructive and real-time monitoring of the aging degree of a cable insulating layer; and complex instruments and specially trained personnel are not needed, the time and labor are saved, and the monitoring investment is reduced.

Description

technical field [0001] The invention relates to the field of sensors, in particular to an aging sensor based on conductive composite materials and a manufacturing method thereof. Background technique [0002] Normal load current will cause resistance loss in the cable and generate heat. Due to the poor thermal conductivity of the surrounding insulating layer, the heat cannot be dissipated in time; the thermal conductivity of the soil-covered cable will be worse due to the surrounding soil environment. At the same time, the dielectric loss will also cause heat loss, which seriously leads to thermal oxidation aging of the cable insulation layer. [0003] Effective monitoring before cable aging and failure is an important issue faced by power systems. The monitoring of aging and the prediction of remaining life are generally by monitoring the change trend of a certain characteristic of the cable. The characteristics usually monitored include electrical properties (insulation r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/12G01R27/02G01N27/04
CPCG01R31/1272G01R27/02G01N27/041
Inventor 吕洪坤李卓汪明军郑翔高应明良熊灵奇
Owner ELECTRIC POWER RES INST OF STATE GRID ZHEJIANG ELECTRIC POWER COMAPNY
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