Evaluation of Electrical Tree Degradation in Cross-Linked Polyethylene Cable Using Weibull Process of Propagation Time

Abstract

The main purpose of this paper is to evaluate electrical tree degradation for cross-linked polyethylene (XLPE) cable insulation for three difference models. In order to show the distribution characteristics using phase resolved partial discharge (PD), we acquire data by using a PD detecting system. These acquired data presented four 2D distributions such as phase angle-average discharge distribution, pulse magnitude-pulse number distribution, phase angle-pulse number distribution, and phase angle-maximum discharge derived from the distribution of PD. From the analysis of these distributions, each of the tree models are proved to hold its unique characteristics and the results were then applied as basic specific qualities. In order to evaluate the progresses of an electrical tree, we proposed methods using parameters by means of Weibull distribution to the time of tree propagation. We measured the time of tree propagation for 16 specimens of each artificial tree models from initiation stage, middle stage, and final stage respectively, using these breakdown data, we estimated the shape parameter, scale parameter, and mean time to failure. It is possible to analyze the difference in lifetime between the initial stage, the middle stage, and the final stage, and could be used to predict the lifetime of an XLPE cable from these results.

Hygrothermal ageing characterisation of epoxy resin based on transmission characteristics of microwave resonator with interdigital‐capacitor‐shaped defected ground structure

“…Since all samples were discharged under the same voltage, and the distance between the needle tip and the ground electrode was consistent, the breakdown time of each sample can be used as an index to represent the high voltage insulation performance of the samples. The breakdown time of all thermally aged samples is displayed by Weibull distribution, as shown in Figure 5a [24]. And the breakdown time of all hygrothermally aged samples is shown in Figure 5c.…”

Electrical Trees and Their Growth in Silicone Rubber at Various Voltage Frequencies

“…Electrical trees are pre-breakdown phenomena that accelerate the occurrence of insulation failure [1][2][3][4][5][6][7]. Owing to the harsh working conditions of power electrical equipment, there have been many investigations to determine the influence of temperature, voltage type, voltage frequency, thermal aging, and moisture on electrical treeing characteristics [8][9][10][11][12][13][14][15].…”