Measurement method using coupled transmission lines for voltage transients on the distribution line

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Abstract
It is well known that voltage transients are caused by the operation of switchgears in a power system. The voltage transients travel along the power line as a traveling wave, and cause malfunction of electrical devices, communication systems, and the operational error of a control system.The voltage transients at the making operation of switchgear were examined to obtain the fundamental data for considering the immunity of communication systems used on a power system. However, it was difficult to observe the voltage transients using the potential transformer and the capacitance potential device because the transients were very rapid.Therefore, a measurement method using the coupled transmission line system is proposed to measure the high‐speed and high‐voltage transients, and the actual experimental results on the 6.9‐kV power system are presented. This method enables the measurement of high‐speed voltage transients in out of contact with the power system.

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