Method for aging evaluation of composite insulator on condition of rapid temperature change

Abstract

The invention relates to a method for aging evaluation of a composite insulator on condition of rapid temperature change. The method comprises: step one, a hydrophobic level of the upper surface of ahigh-voltage-side shed of a composite insulator is measured by using an HC water-spraying rank method and hydrophobic information is recorded; step two, a to-be-tested composite insulator is boiled and is wiped with absolute ethyl alcohol, so that the hydrophobic property is eliminated completely; and then the processed composite insulator is placed in a dust-free environment and time of restoration of the hydrophobic level of the composite insulator to the level before boiling is measured; and step three, a shore hardness value of the edge of the high-voltage-side shed surface of the composite insulator is measured by using a Shore durometer, wherein five points arranged at equal intervals are selected during the measurement and then the average value of the hardness values of the five points is calculated. According to the invention, the insulator aging state in an area with the special weather condition having the large temperature difference is evaluated by extracting typical feature parameters, so that the aging state of the composite insulator is reflected accurately and truly. The method has the certain guidance significance in composite insulator usage.

Description

technical field [0001] The invention relates to a composite insulator aging evaluation method under the condition of drastic temperature change. Background technique [0002] Composite insulators have the advantages of light weight, high mechanical strength, strong hydrophobicity, good pollution flashover resistance, unexpected zero value and less maintenance. Since the early 1990s, they have been widely used in power systems. At present, my country has nearly 10 million composite insulators are running on lines of different grades all over the country, and the usage ranks second in the world. It has become one of the main means to solve the insulation in polluted areas in my country. However, as composite insulators are subjected to comprehensive effects of various factors during operation, aging phenomena such as hydrophobicity decline, shed discoloration, hardening, and cracking will occur, resulting in flashover. As the power system and power grid construction become inc...

AI Technical Summary

Problems solved by technology

These methods can evaluate the aging degree of composite insulators to a certain extent, but the selected reference quantity is single and cannot fully reflect the real aging situation of composite insulators. damage, affecting its further use

The most important point is that the current methods are all aging evaluation methods of composite insulators under general conditions, and the aging characteristic parameters of composite insulators in areas with large temperature changes are not selected for evaluation

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