ZHENG Yuping,PENG Kai,LI Xuefei,et al.Novel Buchholz Protection Technology Based on Characteristics of Free Gas[J].Automation of Electric Power Systems,2023,47(21):165-172.
ZHENG Yuping,PENG Kai,LI Xuefei,et al.Novel Buchholz Protection Technology Based on Characteristics of Free Gas[J].Automation of Electric Power Systems,2023,47(21):165-172. DOI: 10.7500/AEPS20221216002.
Novel Buchholz Protection Technology Based on Characteristics of Free Gas
The operation of existing transformer Buchholz protection only relies on the volume of accumulated gas in the gas chamber of the Buchholz relay. On the one hand
the protection is susceptible to various non-fault factors such as gas stall
which can lead to incorrect alarm signaling. On the other hand
operation and maintenance personnel need to conduct manual gas sampling from the transformer gas box after the alarm
which poses a significant safety hazard. This paper conducts experiments on typical discharge defects inside transformers
and obtains the gas production characteristics and variation patterns of free gas during the development process of internal discharge defects in transformers. A novel Buchholz protection technology based on characteristics of free gas is proposed
and a novel Buchholz protection device is developed
which integrates automatic gas extraction
automatic analysis and automatic diagnosis. It can timely clear internal faults in transformers and prevent accidents from further developing and expanding.
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