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Mechanical characteristics related to fault currents in bundle conductors |
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| Authors: | Makoto Hanamura Takayuki Kobayashi Kouji Yoshida Yasuo Serizawa |
| Affiliation: | 1. Tokyo Electric Power Co. Makoto Hanamura joined Tokyo Electric Power Co. in April 1978 after obtaining a Master's degree from Tokyo Institute of Technology. He has been involved in the research and development of EHV substations and their construction technology. He is currently an acting manager of the substation department.;2. Tokyo Electric Power Co. Takayuki Kobayashi joined Tokyo Electric Power Co. in April 1894 after obtaining a Bachelor's degree from Yokohama National University. He has been involved in the research and development of EHV substations and its construction technology. He is currently with the substation department.;3. Furukawa Electric Co. Kouji Yoshida joined Furukawa Electric Co. in April 1969 after obtaining a Bachelor's degree from Yokohama National University. He has been involved in the research and development on the substation busbar and overhead transmission line. He is currently a manager of Research and Development Division of Overhead line.;4. Yokohama National University Yasuo Serizawa joined Yokohama National University after obtaining a Bachelor's degree from Tokyo University in 1953. He also has a Dr. of Eng. degree. He became a full Professor at Yokohama National University in 1975. He served as director of editing committee of IEEJ, and a vice chairman of Power and Energy Society of IEEJ from 1986 to 1987. |
| Abstract: | The flow of fault currents in bundled conductors induces an electromagnetic attraction between subconductors and thereby the bus conductor system to an extremely high level of tension. This tension, which is the most important factor in designing the mechanical strength of the system, is determined by a large number of parameters—the magnitude of the fault current, the size and number of the subconductors, spacer interval, the spring of the structure, and so on. Full-scale 63-kA class fault current tests were carried out on eight types of bus conductors used in 275-and 500-kV subconductors, and measurements of fluctuation in tension were used to clarify the relationship between the various parameters and maximum tension at fault time. A method also was devised for calculating maximum tension at fault time on the basis of the various parameters, and it has been applied in the mechanical strength design of the bus conductor system. |
| Keywords: | Bundle conductor short-circuit current electromagnetic attractive force tension spacer interval |