Research and Design of Electric Energy Online Metering Device for High Voltage Transmission Line Based on Electric Field Coupling Method

The energy metering of high-voltage transmission lines usually adopts voltage transformer PT to reduce the voltage, and then combines with current transformer CT on the secondary terminal. The reason is that the voltage, current and phase difference cannot be directly obtained. In order to overcome the problem that the traditional electric energy metering device cannot directly measure the electric energy of high-voltage transmission lines, this paper proposes a noncontact method to obtain the voltage phase of high-voltage transmission lines based on the field coupling method, and uses the open-ended current transformer to obtain the effective value and current phase of the current. The practical test shows that the electric energy metering device is easy to use, low cost, stable and reliable, and can meet the direct measurement of electric energy of high-voltage transmission lines.