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Eng.alasad
Member

Join Date: Jul 2007
Posts: 8

Transformer Oil Testing (tan delta)

02/03/2008 4:05 AM

Hi All,

Can anybody tell me the following:

1) The definition of tan delta for transformer 's oil and 3coreX300 sq.mm XLPE cables.

2) The acceptable values for each of them.

3) Is it a site test or routine test?

4) a profitional website that explains all.

Thanks
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Anonymous Poster
#1

Re: Transformer Oil Testing (tan delta)

02/03/2008 10:55 PM

Tan delta (dissipation factor) or Power Factor of the transformer oil (New) is usually less than 0.5% at 100C.

Used oil should be below 1% otherwise reclaim oil to improve the oil.

Cable oil Power Factor (new) is very similiar accept some utilities have more strict guidelines. ie new oil = 0.3% used cable oil <0.7%

Power Factor is basically defined as the dielectric loss factor.

Higher PF means more losses via the oil or oil/paper (Doble test)

As oil ages it forms oxidation products (free radicals) or any ionic compounds (metals) will increase Power Factor.

It is a routine test for new acceptance oil or used cable oil.
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Anonymous Poster
#2

Re: Transformer Oil Testing (tan delta)

11/30/2009 10:04 AM

Please visit www.powerelectronical.com to know about products and services that you can utilise for Insulation Quality Testing. Always consult the experts!!

For more information, please write specifically to contact@powerelectronical.com
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Anonymous Poster
#3

Re: Transformer Oil Testing (tan delta)

10/28/2010 7:26 AM

1. Dielectric disiapiation factor of oil,is called Tan delta.i.e percentage of power disiappiated by the insulating oil when it is subject to the Power supply. Dielectiric Loss is called as tan delta. 3 core X 300 sq.mm means cable of cross link ethylene with the 300 mm2 of 3 no's insulated conuctor which is present in the cable. 2. Acceptable Limit vaires from 0.005 to 0.01.above the 0.01 is not accpetable. 3. Tan delta)this test can be performed in the site as well LAb. 4. u can check in Google search. with regards A.Hariharasubrramanian Siemens Dubai
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