ONAN/ONAF Transformer Fan Switching Controller

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nshingate Associate Join Date: Jan 2010 Location: Singapore Posts: 26	ONAN/ONAF Transformer Fan Switching Controller 10/18/2011 3:23 AM
	In reference to say 40/50MVA 33/11kV transformer How transformer loading is monitored to switch on & off ONAN/ONAF tarnsformer's fans? Similar to winding temperature monitor.. oil cup & CT? Or vendor actually do have load monitor (CT & PT inputs wired) with digital output contacts programmable for switching on fans at perticular loads?
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electricalexpert65 Guru Join Date: Oct 2009 Posts: 2061 Good Answers: 169	#1 Re: ONAN/ONAF Transformer Fan Switching Controller 10/18/2011 7:48 AM
	The most fool-proof method is WInding temperature monitoring.
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Sheth Participant Join Date: Sep 2011 Posts: 2	#2 Re: ONAN/ONAF Transformer Fan Switching Controller 10/19/2011 7:24 AM
	Not sure about load but vendor will provide the digital output from the winidng and oil temperature to switch on and off the fans.
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