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We performed a sensitivity verification for a loop-type electrode embedded in an insulation material according to CIGRE recommendations [1], and clarified that a loop-type electrode can play a significant role as a partial discharge (PD) detecting sensor.
This paper deals with the method of PD detection with the sensor (antenna) put at the outside of the GIS tank. It pays attention to the flange of the spacer as a leakage place of the PD electromagnetic radiation. Three kinds of antennas are proposed and made for trial purposes. And comparative study of the three antennas with the internal PD sensor (disc coupler) used worldwide so far is made from...
We introduce in this paper the sensitivity of two UHF couplers, disc-type measuring electrode and loop-type measuring electrode embedded in an epoxy insulator, for detecting partial discharge (PD) and diagnosing GIS. Each of the couplers has sufficient performance for detecting the electromagnetic waves up to 8 GHz. The attenuation characteristic of electromagnetic waves is changed depending upon...
The authors have studied insulation diagnostic technique of gas-insulated switchgear (GIS) by UHF method. It is known that PD-induced electromagnetic wave is affected by a discontinuity part of impedance such as L-shaped structure, spacers and so on. In this paper, we experimentally investigated influence of L-shaped structure on propagation properties of PD-induced electromagnetic wave measured with...
The authors have studied insulation diagnostic technique of gas-insulated switchgear (GIS) by UHF method. In this paper, we investigated the effect of spacer type (metal flange type (MT) or bush type (BT)) on the propagation properties of PD-induced EM wave in GIS with UHF method. Low pass filtering process for cut-off frequency of TE11 mode was used to eliminate the higher order mode above TE11 of...
The finite difference time domain (FDTD) method has been applied to an investigation on the attenuation characteristics of partial discharge (PD) pulses propagating through various parts constituting a gas-insulated switchgear (GIS), such as insulators and T-junctions. A simulator for analyzing three-dimensional transient electromagnetic fields using the FDTD method is considered to be the most promising...
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