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Study on field demonstration of high‐sensitivity SF6 leakage detection method for gas insulated switchgear
Author(s) -
Tatemi Masaru,
Inami Hisao,
Rokunohe Toshiaki,
Hirose Makoto
Publication year - 2021
Publication title -
electrical engineering in japan
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.136
H-Index - 28
eISSN - 1520-6416
pISSN - 0424-7760
DOI - 10.1002/eej.23295
Subject(s) - switchgear , circuit breaker , current (fluid) , conductor , leak , sulfur hexafluoride , nuclear engineering , sensitivity (control systems) , leakage (economics) , operating temperature , leak detection , materials science , temperature measurement , electrical engineering , environmental science , mechanics , engineering , electronic engineering , composite material , thermodynamics , chemistry , environmental engineering , economics , macroeconomics , physics , organic chemistry
SF6 gas is widely used in power equipment such as gas insulated switchgear or gas circuit breaker. However, its global warming potential is 23,500 times higher than that of CO 2 . In consideration of environmental protection, detection of SF6 gas leakage with high sensitivity is necessary. The authors proposed an algorithm to accurately estimate the average gas temperature from the tank surface temperature for establishing a high‐sensitive SF6 slow leak detection technology. Since the gas temperature depends on the temperature of the conductor, the algorithm was characterized by estimating the gas temperature from the tank surface temperature and the load current. The relationship among the tank surface temperature, the gas temperature, and the current was preliminarily investigated by the use of the thermal fluid analysis and stored in the database. By use of this method, the fluctuation of the converted pressure in the basic examination test was suppressed to 20% as compared with that without considering the current. In addition, database was also created from the machine learning of field test result in substitution. In the field test, it was confirmed that the detection time of 0.5%/year slow leak could be detected in about 8 months by considering the load current.