CR4 - Thread: Dissipiation Factor exceeds 1.5%

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Guest	Dissipiation Factor exceeds 1.5% 07/01/2009 11:41 PM
	we have tested an 500kv 11/0400 kv earthing transormer in dubai,oil temperature is about 35 - 40 degree.on the LV side ( 400 v) power factor value is nearly 2%.tell me what could be the reason other power factor values are satisfactory.advice us how we can improvise the value.during testing relative humidity is more than 50,was that isthe reason.
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elkangorito Commentator Join Date: Nov 2008 Location: S.E. Asia Posts: 91 Good Answers: 1	#1 Re: dissipiation factor exceeds 1.5% 07/02/2009 8:00 AM
	If this piece of equipment is expensive, you should not be asking these questions here. I would advise that you enlist a consultant (or an expert) from your local area. __________________ "If you try to keep a leg each side of a barbed-wire fence, you'll do yourself a mischief." - Joh Bjelke-Petersen.

Guest	#2 Re: Dissipiation Factor exceeds 1.5% 07/03/2009 1:20 AM
	Dissipation Factor increases with aged oil (oxidation products) and also metals in the oil. Fuller's earth reclaiming the oil will improve the Dissipation Factor (decrease it) salim

Guest	#3 Re: Dissipiation Factor exceeds 1.5% 07/04/2009 2:26 AM
	1. must be compare with DF when receive first time. 2. if df is same the codition of trafo's is fair and good. 3. higher the transformer is deteorition even bad condition 4. extremely different is damage.

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