Improving insulation quality of ceramic insulated conductors by dip coating with boron oxide

In the past few years there has been a growing trend in the use of ceramic coated high temperature resistant wires for applications up to 500 °C. The main drawback in developing new materials has been the relatively poor dielectric characteristics at high temperature. One solution is to strengthen the ceramic layer by covering it with boron oxide and this additional layer improves the dielectric characteristics of the ceramic wire. Partial discharge inception voltage threshold is greatly increased compared to non-impregnated wires and this has been observed over a large temperature range.