Abstract
In this paper, silicone rubber on composite insulators from three different manufacturers with an operating duration between 1 and 10 years were sampled. In order to investigate the law of diminishing performance of these samples in aging process, widely adopted aging process evaluation test methods such as Hydrophobicity test, Water absorption test were performed. Based on test results, parameters significantly correlated with operating time were obtained by means of correlation calculation. Finally, considering the differences of parameter values among three manufacturers, the relative decrease value (denoted as $w$ ) of parameters was proposed as a unified standard and the equivalent equations between $w$ and operating time were established for predicting lifespan of composite insulators in high altitude area. Test results indicate that parameters including saturated water absorption ratio $\delta _{s}$ , the relative content of Si and O elements ( $X_{Si}$ and $X_{O}$ ) are significantly correlated with operating time, and these three parameters can be used to characterize aging degree of composite insulators. Besides, for the relative error $\sigma _{1}$ between theoretical operating time calculated by the equivalent relationship obtained in this paper and actual operating time is less than 20%, within the allowable error range of engineering practice, this equation can be applied to predict the operating time of composite insulators from three manufacturers in future research.
Highlights
Since the 1960s, composite insulators were widely used in power transmission line systems [1]–[4]
This paper studies the aging properties of composite insulators aging in natural environmental experiment station through physical, chemical and electrical tests in aging process and explores aging characterization parameters based on test results
Considering the differences resulting from different components of three manufacturers, the relative decrease value compared with the initial value was proposed as a unified standard, and the equivalent relationship significantly correlated parameters and operating time can be obtained based on the parameter w
Summary
Since the 1960s, composite insulators were widely used in power transmission line systems [1]–[4]. To enhance the accuracy of test results, three pieces of the sample from the same manufacturer with the same operating time were selected and each for three repeated tests, and the average value of flashover voltage was obtained to compare electrical properties between composite insulators aged for different years.
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