熱像應用於避雷器檢測之研究

• Main Author: 陳建弘
• Other Authors: 林正亮
• Format: Others
• Language: zh-TW
• Published: 2010
• Online Access: http://ndltd.ncl.edu.tw/handle/37588246531546256564

碩士 === 國立嘉義大學 === 生物機電工程學系研究所 === 98 === Taiwan is located in the subtropical region with thunder frequently. Hence, lightning strike protection is very important in the electricity system. The purpose of an arrester is to prevent voltage spike and electricity current damaging the line and equipment as lightning striking. If the arrester is abnormal or damaged, the line and equipment could not be protected and even could cause electric accident. Therefore, on-line arrester inspection is very important since it could reduce unnecessary power cut maintenance. 147 arresters in the 4 traditional transformer substations were inspected every month for 7 months, 1029 measures totally, with thermographic technology in this study. Since arresters are likely to have high temperature as damage, the thermography is a potential method to inspect whether arresters are damaged or not. When an arrester showed extraordinary high temperature during inspection, the average temperature and the maximum temperature difference of the possible damaged arrester were analyzed with similarity comparison. Results indicated that the average temperature of the damaged arrester was 2℃ higher than that of normal arresters. And the maximum temperature difference of a normal arrester was about 2℃, whereas the value could reach 7℃for the damaged arrester. After thermographic analysis, the possible damaged arrester was inspected by the on-line leakage current technology of Irms and I180 to justify the possibility of damage. The results showed that the possible damaged arrester was highly likely to be damaged too. Hence, the more reliable method of traditional power cut examination technology was used to verify the accuracy of the on-line inspection technologies. Inspection results with thermographic method associated leakage current agree with the traditional power cut examination. Therefore, thermographic method is one of the inspection technologies for damaged arresters.