Аналіз змін показників якості ізоляції високовольтних вводів протягом тривалої експлуатації

Abstract

The results of periodic measurements of quality indicators of condenser type insulation high-voltage bushings considered as a time series containing information about changing the value of this indicator since the installation of inputs and the current moment. The task of forming an array of statistically homogeneous time series reduces to finding a combination of time series of indicators that would provide the maximum value of the correlation ratio for a given time interval. For the formation of groups of bushings with the same drift velocity indicators of quality insulation used criterion of maximum empirical correlation ratio. It was formed several data sets for each indicator of quality insulation, for which as a result of the testing was find the maximum value of the correlation ratio. To evaluate the effectiveness of the performing procedure statistically homogeneous time series analysis was performed tightness stochastic association between indicators of the quality of the bushings insulation and time of exploitation. It was found that under conditions of continuous operation, the aging of the high-voltage inputs isolation takes place at different speed.