Research on Analysis Method of Current Loop Fault in High Voltage Electric Energy Metering Device

A large number of clean energy sources, such as distributed photovoltaics and wind power are connected to the grid, which further increases the number of electric energy metering devices. Three-phase three-wire electric energy meters connected by PT and CT are widely used in low-current grounding systems of 35kV and below, and due to the complicated wiring, there are a large number of wrong wiring on site, resulting in inaccurate measurement and loss of state-owned assets. Therefore, higher requirements are put forward for the ability of on-site staff to check and analyze the wrong wiring of the electric energy meter. Aiming at the situation of incorrect measurement caused by the current loop failure, this paper proposes a simple analysis method for the secondary outlet and current of the electric energy meter of the sum and difference current, which greatly improves the accuracy of the analysis and shortens the analysis time. The effectiveness of this method is verified through the analysis of numerical examples.