Open AccessAnalysis of the Cause of Leakage Oil Defect in a Voltage-Dividing Capacitor of a 500kV Porcelain Circuit Breaker
Author(s) -
Yang Xiao,
Hongkun Li,
Chunhong Wu
Publication year - 2021
Publication title -
journal of physics. conference series
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.21
H-Index - 85
eISSN - 1742-6596
pISSN - 1742-6588
DOI - 10.1088/1742-6596/1750/1/012083
Subject(s) - leakage (economics) , circuit breaker , capacitor , grading (engineering) , electrical engineering , engineering , voltage , petroleum engineering , power grid , residual current device , materials science , power (physics) , civil engineering , physics , economics , macroeconomics , quantum mechanics
In recent years, with the development and construction of the power grid system, the porcelain column circuit breaker has been popularized and applied in the 500kV substation. However, in the actual operation and maintenance process, the leakage of oil has been found in the grading capacitor. The disassemble of an oil leakage grading capacitor of a 500kV porcelain column circuit breaker is analyzed in this paper. Through carrying out the sealing test; the insulation performance test; salt spray test and simulation test. At the same time, by comparing the sealing ring and cover plate material; calculating the potential difference of the cover plate and researching electrochemical corrosion factors. We can come to an conclusion that the cause of a suspected the grading capacitor oil leakage is the oil accumulation; and the main reason for the oil leakage problem of the grading capacitor is the electrochemical corrosion phenomenon on the sealing cover plate. Finally, on the basis of the reasons, the relevant rectification measures are put forward.