Research of insulating oil percolation in electrical pressboard using optical registration

The paper presents developed and built measuring system for oil percolation through electrical pressboard speed measurements. The system by using automatically controlled camera records the time of percolation. The rate of insulating oil Nytro Taurus, produced by Nynas company, penetration across electrical pressboard, produced by Weidman company, was investigated. The time dependence of insulating oil percolation on sample thickness has been designated. New method of pressboard capillaries radius determining on the basis of oil percolation speed experimental measurements has been developed. It was found that electrical pressboard capillary radius is from 45 nm to over 100 nm.