INVESTIGATION OF PD PULSE-PROPAGATION CHARACTERISTICS IN GIS

Concentrating on the TEM mode, damping characteristics of partial disc harge (PD) pulses propagating through each GIS component were investig ated. As a result, it was discovered that frequency components above 5 00MHz were remarkably damped by spacers, T-shape branches, and L-bends . Quantitative studies were undertaken on the frequency dependency of this damping characteristics. Then the equivalent circuits for analyzi ng the propagation characteristic of PD pulses were proposed. Furtherm ore, the validity of concentrating on the TEM mode was denoted by test s at a substation in service.