Research on SF6 gas decomposition detection method based on electrochemical sensors

• Published in: 2016 International Conference on Condition Monitoring and Diagnosis (CMD) pp. 530 - 533
• Main Authors: Rixin Ye, Ming Dong, Jialin Liu, Ming Ren, Jiacheng Xie, Ao Ma, Li Wang
• Format: Conference Proceeding
• Language: English
• Published: IEEE 01.09.2016
• Subjects: Electrochemical sensors; Fault detection; Matrix decomposition; Monitoring; Response characteristic; sensor data matrix; SF 6 decomposition products; Sulfur hexafluoride; Temperature compensation; Temperature control; Temperature measurement; Temperature sensors
• DOI: 10.1109/CMD.2016.7757879

SF 6 gas-insulated electrical equipment has been widely used in high-voltage and extra-high voltage power system. The electrical equipment could generate partial discharge and local overheating because of the insulation faults, which further results in SF 6 gas decompensating and finally generate several kinds of SF 6 decomposition products. The SF 6 decomposition products can be quantitatively detected by using relevant electrochemical gas sensors, which contributes to deducing the equipment internal faults. A testing platform of electrochemical sensors detecting is established in this paper firstly. Through configuring and detecting SF 6 decomposition products in the detection tank, the response characteristics of CO, SO 2 and H 2 S sensors have been achieved. The experiment results show that CO sensor has a negative temperature characteristic, SO 2 and H 2 S sensors have a positive temperature characteristic, and the temperature compensation curves are fitted by using quadratic fitting method. All sensor have a good linear relationship, but SO 2 senor has a response to H 2 S gas, so the sensor data matrix is used to guarantee the measurement accuracy. In the end, the multi-component mixing gas is configured and used to verify the sensor data matrix, and the results show sensor data matrix has high reliability and accuracy.