Electricity India

Nariman Point, Mumbai, Maharashtra

a) The plug at the end of the breather pipe is to be removed and breather fitted on to the pipe along with the fly nut. b) It is necessary before fitting the breather to observe the colour of the silicagel. If necessary, the breather should be opened and the silicagel properly dried up so that its colour is perfectly bluish. c) The chamber at the bottom of the breather should be filled in with dry transformer oil up to the level marked.

The observation glasses should show that the buchholz relay is properly filled with oil. If necessary, bleeding can be done from the two cocks. The drain plug should be tight and no leaking should be there. The cover on the connection chamber should be opened to observe whether connections are properly tight.

This should always be in fully open position while the transformer is being energised. The chamber at the bottom of the breather should be filled in with dry transformer oil up to the level marked.

This will be set in the same way as the dial type thermometer excepting that the trip contact should be set at ambient temperature plus 55°C.