Evaluation method of aging state of xlpe cable insulation water tree based on current offset coefficient

Abstract

The invention discloses a method for evaluating the aging state of an XLPE cable insulation water tree based on a current offset coefficient. Responds to current excursion coefficients, calculates insulation condition evaluation parameters, and evaluates cable insulation conditions. The beneficial effects of the invention are: online detection and evaluation of the aging degree of insulating water tree branches in the damped cable can be carried out conveniently, efficiently and safely, so as to avoid the insulation breakdown caused by the serious deterioration of the insulation of the damped cable, and reduce the loss caused by the cable fault; It provides a basis for the operation and maintenance personnel to evaluate the service performance of the cable in time, which can effectively ensure the reliability of the cable line operation and improve the utilization rate of equipment assets, which has high economic and social significance.

Description

technical field [0001] The invention relates to the field of cable insulation aging assessment, in particular to a method for assessing the aging state of XLPE cable insulation water trees based on a current offset coefficient. Background technique [0002] my country's economic construction is developing rapidly, electric energy has gradually been widely used in various industries, and the construction of electric power facilities is also in progress. Power cables are an important factor in determining the safety and stability of power systems. However, the cable runs in a strong electric field, high temperature and humidity environment for a long time, and it is vulnerable to the intrusion of moisture and moisture during operation. Under the action of the electric field, water branches appear inside the insulating material, which makes the electric field inside the cable concentrated and the tolerance capacity is reduced. Under certain conditions, it can be converted into...

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Problems solved by technology

However, the cable has been operating in a strong electric field, high temperature, and humid environment for a long time, and is vulnerable to moisture and moisture intrusion during operation. Under the action of the electric field, water branches appear inside the insulating material, which makes the internal electric field of the cable concentrated and the tolerance is reduced. Under certain conditions, it can be converted into electrical branches and cause a certain degree of insulation defects, resulting in irreversible functional degradation of insulation performance. In severe cases, insulation breakdown accidents will occur, which will bring great hidden dangers to the safe and stable operation of the power system.

[0003] At present, there are still relatively few methods for evaluating the water branch aging state of XLPE cable insulation, and there is no convenient detection method that is widely popularized and applied.

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