OLTC oil filtration

T

Thread Starter

thiagusriram

We have got 4 x 40 MVA, 220 kV /11 kV power transformers in our 135 MW power plant. Every year during inspection we observe black dust collection on top portion of OLTC. This is probably due to deterioration of OIL during tap changer operation. Hence we used to replace the oil of OLTC. Can any one guide me whether the oil can be filtered and reused in the OLTC again if we get good BDV value? Each OLTC needs 350 ltrs of oil.
 
Yes Online OLTC filtration system is available in the market from OLTC OEM. You may google website of MR and ABB for details.

I have online filtration system installed in my 155MVA transformer for some years now.
 
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