Abstract
Partial discharge (PD) occurring inside a bus duct would emit electromagnetic (EM) wave in wide frequency that propagates and leaks to the outside, and it also excites the surface current on the metal wall of the duct. It would produce a transient earth voltage (TEV) as a result of current and impedance of the material. Simulation is performed with a bus duct model to study the characteristics of the surface current giving rise to TEV signal by Finite Difference Time Domain (FDTD) method. Simulation results reveal that the surface current is influenced by PD source magnitude and frequency, sensor location, bus duct structure, equipment inside, and the opening part for the EM wave leaking out. We can estimate the PD location by using multiple observation points as TEV sensor.
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