Power Circuit Breakers
Insulation Power Factor
Better known as the “DOBLE Test”, IPF or insulation power factor test is the most comprehensive measurement of insulating properties of a power transformer or any apparatus with a winding. Elements such as deterioration, contamination, moisture, and heat can breakdown dielectric strength. Insulation Power Factor Testing measures the dielectric losses due to leakage current thru the insulation.
The insulation resistance test is a direct current evaluation test of the insulation and gives a reliable indication of the presence of moisture, contamination, or breakdown in the insulation. This test also establishes a benchmark for future comparative tests.
PAD defined is a localized dielectric breakdown within a small portion of an electrical insulation system under stress of high voltage, which does not bridge the space between two conductors. Partial Discharge is not yet a complete failure of the insulation, however, it is an indication of what is to come. PD testing determines the presence, and locates PD activity within a system.