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Answer Posted / anil kumar
whenever it is incipient fault in transformer, the gaseous formation take place which moves up wards from bucz relay, and replaced the oil in upper tub and press the tub , so due to mercury switch, ckt will complete & alarm will appear , if further severe fault , the oil pr. increases in tank and will go in conseverator tank through buz relay which makes press the bottom tub forcibly and trip the ckt .
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