Nowadays, porcelain string insulators are commonly used in high voltage transmission lines. The study of temperature distribution is extensively performed in the design and development of high voltage insulations. As known, the infrared technology has opened the door to a variety of applications and especially it is also used as a kind of non-contact remote detection technology which has the advantage for detecting high voltage faulty porcelain insulator. Thanks to it, this paper uses the infrared technology to investigate the temperature distribution of the 220kV power grid insulator string. The experiments were done in climate chamber to study. Firstly, determining the thermal stability time of the high voltage porcelain insulator called XP-70 type composing of 14 pieces under the tested voltage of 127kV based on the temperature and voltage distribution. And then the temperature distribution along the normal and fault insulator string experiments. The experimental results show that it may detect and compare the insulator metal cap temperature of faulty insulator in the porcelain insulator string and determine the location of them. And especially based on the unchangeable voltage distribution, it may detect the temperature distribution characteristic for the fault insulator string. Therefore, this research results can provide a reference to detect the faulty porcelain insulator strings
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