Voltage Rating of Kraft Transformer Insulating Paper vs Kraft Diamond Epoxy Paper 1

[VLFit]

In terms of volts/mil, are these two equal in their voltage ratings. When oil soaked following a full vpi and when not soaked.

 

[electricpete]

I haven't heard of kraft diamond paper but I guess it's this

https://www.electro-wind.com/3-mil-...per-flexible-laminate-105c-brown-48-wide-roll

Clicking specs at the bottom of that page, shows 50 kV/mm oil soaked for that product.

I don't think the phrase vacuum pressure impregnation (VPI) applies to any of this, but I gather you mean filling with oil under a vacuum.

 

[prc]

No difference in KV/mm between the two. BDV in oil is approximately 5-7 times more than in air.