Automatic oil sampling equipment for 500 kV transformer

SHI Chuan1， ZHAO Tie-zhu2， LIU Can-pei2
（1. School of Electrical Engineering， Wuhan University， Wuhan 430072， China；
2. School of Power and Mechanical Engineering， Wuhan University， Wuhan 430072， China）

Abstract： In recent years，the number of 500 kV transformers of the national power grid is increasing rapidly. Using the traditional oil sampling method，unqualified samples for many 500 kV transformers or reactors resulted in failure monitoring analysis of the chromatogram and gas content. In order to solve the problems of the distortion of the oil samples for 500 kV transformers，an automatic oil sampling equipment was introduced. The route of the sampling oil and nitrogen was designed. Based on single-chip microcomputer，the control technological process was presented. The influence on the sampling precision was analyzed. The results show that the equipment can simply and quickly carry out operation with high precision，high vacuum and high cleanliness for 500 kV transformer．
Key words： 500 kV transformer；automatic oil sampling；single-chip microcomputer