Development of Portable Partial Discharge Monitoring Systems

• Main Authors: Kuan-Hua Hsu, 許冠華
• Other Authors: Ruay-Nan Wu
• Format: Others
• Language: zh-TW
• Published: 2019
• Online Access: http://ndltd.ncl.edu.tw/handle/fuehk8

碩士 === 國立臺灣科技大學 === 電機工程系 === 107 === Our country has gradually replaced traditional energy sources with renewable energy as a means of generating electricity. In addition to air pollution and other issues cause power supply to be tight. In case of unexpected failure of power equipment, it will cause a major loss of people's livelihood economy. Among them, the most frequent accidents occur in the connection part of the underground cable. For the insulation maintenance diagnosis of power equipment, international research has regarded partial discharge as an indicator to observe the insulation of high-voltage equipment. This paper proposes a portable partial discharge monitoring system consisting of a measuring unit, an analog signal processor, a TMS320F28335 digital signal processor and a portable computer. The digital processor controls the analog signal processor to perform partial discharge measurement. The data is transmitted to a computer for feature extraction, insulation diagnosis, interface display and data storage. In this paper, using cable joints containing artificial defects as experiment object and measured by this system and another set of digital system at the same time. The discharge type and discharge phenomenon are compared and verified. The actual test data are combined with the selected insulation diagnosis rules for state diagnosis and provide on-site personnel assessment of maintenance measures. On the other hand, according to the actual underground cable connection, it is proposed to use a tinned copper wire to tie cable joints as a partial discharge path, and adjust the measurement mode. It has been proved by experiments that this method is indeed feasible.