Analysis of Treeing Phenomena by Discharge Magnitude and Discharge Luminescence in Each Phase Angle

Abstract

This research is carried out to analyze the treeing phenomena with a needle shaped void by the discharge magnitude and the luminous intensity distribution in each phase angle area at the same time. The discharge pulses and discharge luminescence are measured by the special measurement system for measuring the discharge magnitude and discharge luminous image according to several phase angle areas of applied voltage. Each phase angle area was named φ1-20 in order from the negative peak point of applied voltage. The luminous image was digitized with a computer after the experiment. In particular, in this study, we focused on the discharge luminous intensity distribution in each phase angle area. The results show that the discharge magnitude significantly correlates with the luminous quantity at the tree area in φ8 and φ18. Therefore, the quantities of partial discharge at the φ8 and φ18 phase angle area are considered to be more useful information for a diagnostic technique of the deteriorating condition of electrical treeing.