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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