This paper carries out research of the breakdown
characteristics of oil-paper insulation under pulsating voltage
in the laboratory conditions, studying on the effect of preapplied
different types of voltages and temperature on the
breakdown characteristics of oil-paper under pulsating voltage,
and concludes the variation law of the breakdown voltage of
oil-paper insulation under pulsating voltage changes and the
temperature. The main conclusions as follows:
1) The different pre-applied voltages have certain effect on
the breakdown voltage of the oil-paper insulation. The
breakdown voltage of pre-applied DC component is slightly
higher than that of the pre-applied AC component.