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Method for judging insulation characteristics of cross linked polyethylene (XLPE) power cables on line

A power cable and characteristic technology, applied in the direction of measuring resistance/reactance/impedance, measuring electricity, measuring electrical variables, etc., can solve problems such as system influence, difficulty in realization, background interference, etc., and achieve the effect of preventing accidents

Inactive Publication Date: 2012-07-04
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The dielectric loss factor method is cumbersome to operate and difficult to implement
[0008] (4) Partial discharge method: The partial discharge method uses electromagnetic waves, ultrasonic waves and other signals to detect partial discharges occurring at defects. In theory, it can be detected online, but it is susceptible to background interference and online monitoring is difficult.
This method is simple and easy, and a set of equipment can be used to detect multiple cables, but the disadvantage is that the superposition of electrical signals will have a certain degree of impact on the original system

Method used

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  • Method for judging insulation characteristics of cross linked polyethylene (XLPE) power cables on line
  • Method for judging insulation characteristics of cross linked polyethylene (XLPE) power cables on line
  • Method for judging insulation characteristics of cross linked polyethylene (XLPE) power cables on line

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Embodiment Construction

[0071] Embodiments of the present invention will be further described below in conjunction with the accompanying drawings.

[0072] A method for judging the on-line insulation characteristics of XLPE power cables is based on the thermal circuit model of the power cables. XLPE power cable (cross-linked polyethylene insulated cable) structure such as figure 1 As shown, the power cable includes a conductor 1 and an outer sheath 8. Between the conductor 1 and the outer sheath 8, a conductor shield 2, an insulating layer 3, an insulation shield 4, a metal shield 5, and an inner shield are sequentially arranged from inside to outside. Lining layer 6, armor layer 7. The main heating element in the power cable is the conductor. In addition, the various losses of the cable itself are finally dissipated in the form of heat, such as dielectric loss, metal shielding loss, and armor loss. Therefore, the heat source in the thermal circuit model of the power cable should be Including condu...

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Abstract

The invention relates to a method for judging insulation characteristics of cross linked polyethylene (XLPE) power cables on line, which obtains the temperature and dielectric loss of an insulating layer and relation of insulating thermal resistance by establishing a thermal circuit model of the power cables, further establishes mathematic relation of temperature parameters and dielectric constant of the insulating layer, and judges the insulation damages of current power cables through the dielectric constant of a current insulating layer. According to the dielectric constant of the insulating layer, the method for judging the insulation characteristics of the XLPE power cables on line judges the insulation characteristics of the power cables and learns the insulation damages of power cables, thereby facilitating adoption of corresponding measures and achieving in-advance detection and prevention of accidents.

Description

technical field [0001] The invention relates to a judging method, in particular to a method for judging the online insulation characteristics of an XLPE power cable. Background technique [0002] At present, the transmission and distribution networks of large and medium-sized cities in my country are gradually using high-voltage power cables to replace traditional overhead transmission networks, which is also the premise for the gradual advancement of smart grids and the orderly realization of smart cities. How to safely and stably transmit electric energy on the power cable and extend the service life of the cable becomes extremely important. [0003] The service life of the power cable mainly refers to the service life of the power cable insulation. With the development of electronics, computers, optoelectronics, signal processing and various sensing technologies, the reliability of insulation can be judged at any time and the remaining life of insulation can be predicted...

Claims

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Application Information

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IPC IPC(8): G01R31/00G01R27/26G01K11/32G01K11/3206
Inventor 唐爱红姜德生龚伟梁世兴潘涵周次明刘芙蓉
Owner WUHAN UNIV OF TECH
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