The Detection of Change-Point of Partial Discharges on Power Cable Joints

A total of 6 sets of partial discharge test data of underground cable joints, including 3 sets of defect type A, gaps, and 3 sets of defect type B, holes, were analyzed in this paper. Each test was measured from the accelerating aging experiment which applied voltage from partial discharge inception voltage to insulation breakdown voltage. A statistical method, change-point, was proposed to find the transition of partial discharge status. This method calculated 2 optimal transition points from 2 partial discharge features data. For each test sample, three stages were provided, named as the initial stage, middle stage, and final stage.