著者

甲斐 隆章

出版者

一般社団法人 電気学会

雑誌

電気学会誌 (ISSN:13405551)

巻号頁・発行日

vol.124, no.1, pp.27-31, 2004-01-01 (Released:2008-04-17)

参考文献数

9

被引用文献数

13 11

著者

甲斐 隆章 舟橋 俊久

出版者

一般社団法人 電気学会

雑誌

電気学会論文誌. B (ISSN:03854213)

巻号頁・発行日

vol.112, no.2, pp.138-146, 1992

被引用文献数

1

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To analyze multi faults on a power line, we need to perform many complexed calculations. So, in many cases, we used to do them, using computers, in the actual phase domain. But it is difficult to expose the property and/or the physical meaning of the calculated results, because the computer method is based on many complexed numerical calculations.<br>This paper represents a new analytical method for short circuit studies, which can deal with crosscountry multi fault in double-circuit transmission line with zero-sequence mutual coupling. This method is based on the well known &ldquo;two-component network theory&rdquo; for a balanced three phase double-circuit. Procedure steps are; (1) Represent the network seen from the faulted points, with symmetrical component impedance. (2) Construct the symmetrical equivalent circuits for faults, with imaginary phase shifting transformers. (3) Combine these equivalents with each other, and erase the symmetrical voltages at faulted points, because the phase voltages at faulted points are known. (4) Calculate the currents at the faulted points, by solving the simultaneous linear equations.<br>We applied this method to an investigation of a distance relay's &ldquo; underreach&rdquo; phenomena in case of cross-country multi fault occured on a double-circuit transmission line. Effects of line constants to this phenomena have been well understood.

著者

本橋 準 一ノ瀬 貴士 石川 忠夫 甲斐 隆章 金田 裕敏 石塚 隆司

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) (ISSN:03854213)

巻号頁・発行日

vol.119, no.1, pp.14-23, 1999-01-01 (Released:2008-12-19)

参考文献数

10

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In recent years, enhancement of consciousness for energy saving and problem of environment are widely encouraging the installation of dispersed storage and generation (DSG) units such as co-generation and photo-voltaic generation. When a distribution line with the DSG is disconnected from the main source of utility, the DSG supplies power to the distribution line. The situation, namely islanding, creates various problems for the reliable and safe operation of the distribution line. Thus, the islanding must be immediately prevented by islanding protection equipment. This paper describes an islanding protection scheme and the digital protection equipment for a synchronous generator. The proposed scheme detects an islanding of a synchronous generator from frequency fluctuation occurred by feeding a sinusoidal small reference voltage signal into the auto voltage regulator circuit of the generator. The authors have manufactured the digital protection equipment applying the scheme, confirmed the excellent performance by testing in an artificial distribution line. In the paper, a determining proceeding of the setting value of the equipment is described.