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This paper describes the GHz order electromagnetic (EM) wave generator we have developed that simulates UHF band aerial noise occasionally measured in HV substation. Using this generator and the model GIS, we investigated the invasion properties of such UHF band aerial noise into the model GIS by changing the location of the generator, i.e. partial discharge (PD) source. As a result, PD-induced EM...
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...
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