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How the Oil Surge Relay works? How it protect the OLTC?
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Answer Posted / satish raman pathak
It is a gas operated relay.It is placed between Main Tank & Conservator Tank,with an angle5-7 Degree.There are2 Mercury switches, one in the top & other in the bottom of Bucholz relay,filled with Transformer Oil. When small amount of vapour passes through the relay Top Float will operate, gives Bucholz alarm.In case of heavy internal fault, Large amount of Bubbles forms,operates the Bottom Float , Gives Bucholz Trip.In case of Bucholz Alarm/Trip Relay contact to checked first(IN Alarm/Trip Relay contact will change).then if there was any gas formation occured.Gas should be relaesed through the top Vent of relay( in that time hissing sound is observed in case of Gas present).Have to release all other top vent in Main Tank & Radiator Top.
In case of OLTC, there are saperare OLTC Surge Relay, same as Main tank Bucholz Relay.
After gas release if Trafo again tripped in Bucholz.Then there must be some hot spot/heavy internal fault in Trafo.other necessory testing to be carried out, like Ratio test,Magnetic Balance test,Vector group test,IR Test for further fault finding.
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