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Gunjan Bhilai
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Join Date: Jul 2012
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Transformer Oil

07/18/2012 4:59 AM

In a 400/6.6 KV x-mer, oil experience voltage upto 400 KV between phase and potential diff between Ht-LT is also high but during BDV test oil break-downs only at 80 KV , How ?
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Anonymous Poster #1
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Re: Transformer Oil

07/18/2012 5:02 AM

Water.
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TonyS
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#2

Re: Transformer Oil

07/18/2012 6:58 AM

The distance between the electrodes in a break down test is much smaller than you would find in your transformer. Therefore you will get a figure along the lines of XXKV/cm.

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electricalexpert65
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#3

Re: Transformer Oil

07/29/2012 9:44 AM

80kV Breakdown voltage is across a gap of about 2.5mm. Whereas within the transformer tank, you have much larger gap between the live winding and the earthed tank.
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