2 0 0 0 クロスボンドケーブルの波形伝搬特性に関する一検討
- 著者
- 雨谷 明弘 宮本 豊 長岡 直人
- 出版者
- The Institute of Electrical Engineers of Japan
- 雑誌
- 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 (ISSN:03854213)
- 巻号頁・発行日
- vol.123, no.3, pp.395-401, 2003-03-01
- 参考文献数
- 12
- 被引用文献数
- 1 6
This paper has investigated a surge propagation characteristic on a crossbonded cable by applying a homogeneous model in comparison with a normal-bonded cable. It has been found that the former is basically determined by the inter-core mode of propagation and results in a surge voltage becoming a rather smooth and sinusoidal-like waveshape of which the oscillating frequency corresponds to the propagation velocity of the mode. On the contrary, the latter is dominated by the coaxial mode, i.e. the core-to-sheath mode, on each phase, and the surge voltage is square-like. The propagation velocity of the inter-core mode is roughly given as a difference between the coaxial and the earth-return mode velocities, and thus is smaller than the coaxial mode velocity. The maximum overvoltage on the crossbonded cable is greater than that on the normal-bonded cable in a tunnel-installed cable as is well-known, while the former has been found to be smaller in a directly buried underground cable.
1 0 0 0 PCSに生ずる雷サージ電圧解析と過電圧低減法
- 著者
- 久保 佑太 長岡 直人 馬場 吉弘 雨谷 昭弘
- 出版者
- 一般社団法人 電気学会
- 雑誌
- 電気学会論文誌B(電力・エネルギー部門誌) (ISSN:03854213)
- 巻号頁・発行日
- vol.134, no.2, pp.99-106, 2014-02-01 (Released:2014-02-01)
- 参考文献数
- 13
- 被引用文献数
- 1
A reduction method of a lightning overvoltage on a Power Conditioning System (PCS) is investigated in this paper. The capacitors installed between the circuit and grounding terminal in the PCS determine the response against a first transient. The inductances, winding capacitances and excitation losses of the coils for the filter in the PCS should be also considered for estimating the overvoltage to ground at an input terminal of the PCS. The dominant factors of the maximum overvoltage are a grounding resistance, capacitances between a frame and output terminal of a solar panel and those between the PCS and ground. The overvoltage is decreased with decreasing the grounding resistance of the structure for the solar panels. The grounding resistance of the PCS has a minor effect on the overvoltage. The overvoltage can be reduced when a common grounding method is applied. A length of a cable between the output terminal of the solar panel and the input terminal of the PCS should be as short as possible.