Abstract
This paper proposes a new method for discriminating partial discharges (PD) from external noises by using the first peak height and cumulative wave parameter of internal electromagnetic waves in GIS. The first peak height and cumulative wave parameter in PD signals are new parameters that are related to the PD charge and the PD-sensor point range. The first peak height-cumulative wave parameter distribution consisting of many PD signals has two characteristics, (1) the distribution shape is on a proportional line and (2) slope of the line is related to the PD-sensor point range. These characteristics were confirmed from measured data of a model GIS. This paper proposes a discrimination method using these characteristics. Simulation results show that this method is effective for discriminating PD from noise signals that originate from various points.
