2mm Gap in BDV Test Kit

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sunil singh85 Participant Join Date: Oct 2014 Posts: 1	2mm Gap in BDV Test Kit 10/31/2014 9:17 AM
	why 2mm gap is given in the BDV test kit .
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lyn Guru Join Date: Oct 2008 Posts: 42355 Good Answers: 1693	#1 Re: 2mm gap in BDV test kit. 10/31/2014 9:26 AM
	Surely you must have an opinion why it's 2 (or 2.5) mm. What would you like it to be? ASTM D1816.
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redfred Guru Join Date: Dec 2008 Location: Long Island NY Posts: 15600 Good Answers: 981	#2 Re: 2mm Gap in BDV Test Kit. 10/31/2014 2:02 PM
	What gap? __________________ "Don't disturb my circles." translation of Archimedes last words
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bigg Guru Join Date: Jun 2010 Posts: 1296 Good Answers: 104	#3 In reply to #2 Re: 2mm Gap in BDV Test Kit. 10/31/2014 6:39 PM

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spades Guru Join Date: Aug 2014 Location: Port Macquarie N.S.W. Australia Posts: 1071 Good Answers: 225	#4 Re: 2mm Gap in BDV Test Kit. 10/31/2014 10:53 PM
	I'm assuming that you are referring to the gap between the electrodes, and also assuming that you are referring to a transformer oil dielectric breakdown voltage test kit. If so, the gap is necessary in order to test the dielectric integrity of the oil between the two electrodes, this becomes the test sample. You would normally test then stir and test again, etc. to get different samples between the probes. I would guess that different manufacturers may have varying gaps for their products, possibly dependent on the test voltage of the megger being used.
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pnaban Guru Join Date: Jun 2010 Location: srilanka Posts: 2725 Good Answers: 5	#5 Re: 2mm Gap in BDV Test Kit. 11/01/2014 12:20 AM
	The important criterion for testing transformer oil is Dielectric strength(kV/mm) which the oil/transformer manufacturer or Codes like BS,IEC,NEC,NEMA,VDE etc normally specifies. Also rated rated voltage of transformer is important.Other aspects like tan delta,acidity etc too are important. __________________ pnaban
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Tornado Guru Join Date: May 2009 Location: Richland, WA, USA Posts: 21017 Good Answers: 795	#6 Re: 2mm Gap in BDV Test Kit. 11/01/2014 4:52 AM
	Because Goldilocks said so--neither too big nor too small. (Why a BlowDown Valve would care is a mystery.) __________________ In vino veritas; in cervisia carmen; in aqua E. coli.
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Anonymous Poster #1	#7 Re: 2mm Gap in BDV Test Kit. 11/01/2014 5:22 AM
	To save space. If it was 6mm it would be too big. If it was 3mm the packaging would be bigger. Because some decided to make it that gap size. They packed the wrong gap in the kit. That was all the space that had available when the made the kit. You could only afford the 2mm gap version. The 3, 5, 6, and 10mm gaps are optional extras. I give up. Why?
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Anonymous Poster (1); bigg (1); lyn (1); pnaban (1); redfred (1); spades (1); Tornado (1)

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