Method for evaluating high temperature aging degree of DC cable insulation material based on compound field

A technology for DC cables and insulating materials, applied in the field of high-voltage equipment, can solve the problems of electrical tree aging and breakdown of cable insulation, affecting the safe operation of power cables, etc., and achieve the effect of controllable experimental temperature and accuracy.

Inactive Publication Date: 2018-12-14
TIANJIN UNIV
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Problems solved by technology

However, it can be as high as 150°C in a short period of time when a fault occurs, which seriously affects the safe operation of power cables.
For the operation process of high-voltage DC cables, they are under a certain amplitude of DC voltage, but the pulse voltage introduced d

Method used

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  • Method for evaluating high temperature aging degree of DC cable insulation material based on compound field
  • Method for evaluating high temperature aging degree of DC cable insulation material based on compound field
  • Method for evaluating high temperature aging degree of DC cable insulation material based on compound field

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[0046] Specific examples are given below in conjunction with the accompanying drawings to further illustrate how the device and method for evaluating the aging of high-temperature insulating materials based on the DC superimposed pulse compound field of the present invention are implemented.

[0047] like Image 6 As shown, the present invention provides a high-temperature aging evaluation device for insulating materials based on a composite electric field, which is mainly composed of an experimental device, an electrical tree observation device, a DC superimposed pulse power supply device and a terminal 1, and the terminal 1 is provided with a Matlab language data analysis platform. , the electrical tree observation device observes and records the sample change data in the experimental device, and transmits the data to the terminal 1, and the Matlab language data analysis platform in the terminal 1 performs analysis and evaluation;

[0048] like figure 2 As shown, the exper...

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Abstract

The invention discloses a method for evaluating high temperature aging degree of a DC cable insulation material based on a compound field. A cumulative damage method is adopted to effectively evaluatethe insulation state of an insulation material for a DC cable. The method comprises the following main steps: first, preparing a polypropylene sample based on a pin-plate electrode; then, carrying out the experiment by using an electric branch experiment system device under a high temperature environment; secondly, observing the aging situation of the electric branch of the sample; finally, calculating by using the Matlab language. The pin-plate electrode system simulates the inevitable defects inside the DC cable and effectively simulates the working conditions of the DC cable in the actualoperation.

Description

technical field [0001] The invention belongs to the field of high-voltage equipment, and particularly relates to a method for evaluating the high temperature aging degree of a DC cable insulating material based on a composite field. Background technique [0002] In HVDC cables, the temperature of the cable insulation is related to the cable load. At full capacity, the current flowing through the cable conductors produces temperatures as high as 90°C. This temperature is already much higher than room temperature. However, it can reach as high as 150 °C in a short time during the fault, which seriously affects the safe operation of the power cable. For the operation process of the high-voltage DC cable, it is under a certain amplitude of DC voltage, but the pulse voltage introduced due to lightning strike, commutation failure, operating overvoltage and other reasons will have an adverse impact on the working environment and easily cause cable insulation. The aging and break...

Claims

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Application Information

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IPC IPC(8): G01R31/12G01R31/20
CPCG01R31/1272G01R31/20
Inventor 朱乐为杜伯学李进韩涛田猛
Owner TIANJIN UNIV
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