Ultraviolet Corona Discharge Detection Based on Photomultiplier

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  • Yongli Liao
    Graduate School at Shenzhen, Tsinghua University Department of Electrical Engineering, Tsinghua University
  • Liming Wang
    Graduate School at Shenzhen, Tsinghua University
  • Ke Wang
    Graduate School at Shenzhen, Tsinghua University Department of Electrical Engineering, Tsinghua University
  • Canlin Wang
    Graduate School at Shenzhen, Tsinghua University Department of Electrical Engineering, Tsinghua University
  • Zhicheng Guan
    Graduate School at Shenzhen, Tsinghua University

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Abstract

High voltage equipments, especially polymer insulators may be getting into aging conditions due to the existence of corona discharge on the surface after a long term of running, which would accelerate the deterioration of the surface insulation performance, and even make equipments step into calamity ultimately. So it is significant to detect corona discharge on surface to ensure insulators' stable running. This paper presents the development of a novel corona discharge detection system based on photomultiplier tube (PMT), which has good functions of distance detection for corona discharge in determined region from surface of high voltage equipment and corona characteristics data analysis. In the verification experiments, it was shown that UV corona light can be also taken as characteristic for detecting corona discharge, other than corona leakage current detection, and a linear relationship was shown between the light magnitude and the current magnitude. Furthermore, mean peak value and number of pulses whose peak value is above threshold are extracted from the basic data, which can be used to quantify the development of corona discharge. The results of investigation on polymer insulators suggested that detection of the region between metal end fitting and first shed should be emphasized. The measurements of corona discharge distribution along insulators can be used to learn about the degradation conditions. Detection of polymer insulators in lab and field inspection experience are both soundly verifying the usefulness of the corona detection system.

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