Overvoltage in Insulated-cable-type Down Conductor

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  • Yasui Shinji
    Department of Electrical and Mechanical Engineering, Nagoya Institute of Technology
  • Sakaguchi Kohei
    Department of Electrical and Mechanical Engineering, Nagoya Institute of Technology
  • Tsuchida Takashi
    Technology Development Headquarters, Kandenko Co. Ltd.

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Description

<p>Special facilities such as data centers, computer centers, and hospitals with operating rooms require a extremely static electromagnetic environment. In this study, we investigated the use of insulated-cable-type down conductor as a measure for protection from lightning for these facilities. The overvoltage observed at the injection point of the lightning impulse in the insulated cable was evaluated by an impulse test and a transient analysis using a distributed constant circuit. Overvoltages were measured under a lightning impulse voltage using a commercially available insulating cable of 11m length. The distributed circuit parameters of the analysis model for the cable were determined based on the results of the impulse experiments. Using the constructed analysis model, the lightning overvoltages in the injection point of the cable were analyzed for different lengths of the cable and steepness of the lightning current. It was found that the overvoltage caused by the lightning current in the cable can be evaluated by the reflection of the lightning current using a common ground system. In addition, the overvoltage values could be estimated from the steepness of the lightning current, surge impedance and propergation velocity of the cable, and the cable length.</p>

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