| Summary: | 碩士 === 大葉大學 === 電機工程學系碩士在職專班 === 94 === In Taiwan Power Company’s power system, lightning failures in the summer and salty-foggy failures in the salty-foggy season (from November through March), have been a large proportion of the fault statistic of transmission and distribution line. The failures become great influences to the quality and the reliability of power system. It has become a great challenge to the engineers to reduce such accidents. This analysis will focus on reducing insulator salty-foggy failures, setting standards for design and maintenance.
Insulating insulators are used for insulation of overhead transmission lines and their supporting tower for power delivery. Due to Taiwan surrounded by sea, highly developed in industry, and major power delivery equipments located along coastal areas, the insulators are frequently subjected to pollution from NaCl-fog and dust-fog, and suspended solid particles. Electric arc and flashover often occur on the contaminated insulators. The failure of the insulators usually results in blackout of either local area or whole area along the power transmission. Therefore, to maintain the security and reliability of the power systems, performance of the insulators is vitally important.
This thesis aims at development of measurement methods of equal salt deposit density (ESDD), leakage current experiment and flashover voltage experiment schemes. All the experimental data are collected and analyzed to conclude an alert for possibility of flashover. Hence, the emergent measures to avoid flashover of the contaminated insulators can be taken. The quality and reliability of power supply can be ensured.
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