同軸無反射管路における電磁波伝搬の基礎特性 Fundamental Characteristics of Electromagnetic Wave Propagation in Non-reflection Coaxial Waveguide
Recently, diagnosis of gas insulated switchgears (GIS) is important because number of aged GIS is increasing and maintenance method of GIS is changing from TBM (Time Based Maintenance) to CBM (Condition Based Maintenance). In this paper, the mechanism of electromagnetic wave propagation in a GIS tank is investigated for understanding of fundamental characteristics for partial discharge detection using UHF method. In this paper, the output characteristics of UHF sensor in non-reflection coaxial waveguide are obtained under the various parameters of installation and shape of UHF sensor. The mechanism of electromagnetic wave propagation is investigated with comparison of the experimental result and EMTP (Electro-Magnetic Transients Program) analysis of equivalent circuit. In consequence, it is found that the mechanism of electromagnetic wave propagation can be treated as an equivalent electric circuit in the frequency region below cutoff frequency of TE11 mode, and another mechanism of electromagnetic wave with higher mode dominantly propagates.
- 電気学会論文誌. B, 電力・エネルギー部門誌 = The transactions of the Institute of Electrical Engineers of Japan. B, A publication of Power and Energy Society
電気学会論文誌. B, 電力・エネルギー部門誌 = The transactions of the Institute of Electrical Engineers of Japan. B, A publication of Power and Energy Society 124(9), 1111-1116, 2004-09-01