Buchholz relay is a gas-actuated relay used for protecting:
ASynchronous generators against overspeed
BDistribution feeder cables
CHigh voltage transmission lines
DOil-immersed transformers against internal fault
Explanation
A Buchholz relay is a gas-actuated safety device installed in the pipe between the main oil tank and conservator of oil-immersed transformers. It detects slow gas accumulation from minor faults or rapid oil surges during severe internal short circuits.
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