Evaluation method for operational aging of heat-shrinkable insulating materials

Abstract

The invention relates to a method for evaluating the running aging of a thermal shrinkage insulating material. The method comprises the steps of by combining the power failure overhauling plans of all power supply units, performing on-site sampling to the running aged thermal shrinkage insulating material on electrical equipment; classifying the thermal shrinkage insulating materials naturally aged under running mode; performing mechanical characteristic test to the running aged thermal shrinkage insulating material; performing aging electrical performance test to the running aged thermal shrinkage insulating material; microanalyzing the high-polymer crosslinked net structure of thermal shrinkage plastic; comparing the detection data of the running aged thermal shrinkage insulating material with the related data of a new insulating material, to obtain the final evaluation of the running aged thermal shrinkage insulating material. All samples for evaluation and testing are naturally aged after running in a power system for many years. Therefore, the research achievements can truly and effectively evaluate the aging situation of the thermal shrinkage insulating material, and have a positive effect on guiding the practical power production.

Description

technical field [0001] The invention belongs to the technical field of natural aging of electrical equipment insulating materials, in particular to a method for evaluating the operating aging of heat-shrinkable insulating materials. Background technique [0002] With the development of industry and the increasingly serious environmental pollution, the insulation protection of substations, especially the insulation protection of old substations, is becoming more and more important. Pollution flashover, condensation flashover, icing trip, small animal short circuit, and personal injury accidents caused by bare busbars in substations occur from time to time. The use of heat-shrinkable materials in the comprehensive insulation protection of substations can reduce the occurrence of such accidents and improve the reliability of the power supply system, which is of great significance to the safe operation of the power system. [0003] The heat-shrinkable materials used in substati...

AI Technical Summary

Problems solved by technology

The problems of the evaluation obtained in this way are: firstly, due to the diversity of aging factors and the complexity of aging mechanism, natural aging is undoubtedly the most important and reliable aging test method

However, artificial accelerated aging is only simulated from certain aspects such as light, heat, and humidity under experimental conditions, which is not perfect and accurate.

Secondly, even if various environmental conditions can be simulated, the degree of imposition (intensity and time) and whether there is a mixture of several conditions cannot be accurately grasped, because each working condition has its specific environment and its own characteristics, we can only approach them infinitely, but we cannot equate

[0005] To sum up, artificial accelerated aging is only a simulation of the actual situation, and cannot completely and accurately reflect the real situation of the material.

Therefore, by testing samples formed by unnatural aging and using relevant test data for evaluation, the conclusion may not be in line with objective reality