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buchoulz relay pressure relief valve and protective relay

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Thread Starter

paru

hello
i need to check the buchoulz relay and pressure relief valve and protective relay on my trafo.
i checked the contacts by manually operating.the trip ckt is ok.

i want to know , is there any calibration of the above equipment.can the settings for them changed.

how the above three are specified when selecting for particular transformer?
 
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