Current and Voltage Monitor of Power-Transmission lines for 66kV

摘要

We propose portable equipment that monitors current and voltage of high-potential power transmission lines. In the equipment, a current and voltage sensor are attached to a polymer insulator that supports a power transmission line: A clamped to the power line and the detected current signal is transmitted to the ground station by a wireless optical link using transmission line is detected by a high resistance element, zinc oxide (ZnO). That acts as a potential divider between the power line and ground. We make an experimental device for 60kV power line and demonstrate that it can monitor currents proposed equipment is small-sized, light, and inexpensive in comparison with the conventional CT ( current transformer ) and PT ( potential transformer ) since it does not require high potential insulators and magnetic cores, Further, the equipment is easily installed owing to its small size and its simple structure.