The primary and secondary fusion ring cage is an intelligent set of equipment in response to the latest standard of technical standard for primary and secondary Equipment of Power Distribution. It integrates advanced technologies such as electromagnetic voltage, current transformer, electric energy, metering module, high-speed fault transient filtering, and consists of ring in and ring out unit, feeder unit, bus equipment (PT) unit, centralized DTU and connecting cable. It can collect

active power, reactive power, power factor, frequency, zero sequence current and zero sequence voltage, with line loss metering, power metering function, as well as line voltage identification,voltage over the load limit and other alarm transmission, short circuit fault detection and processing. Single-phase ground fault detection and processing function, support short circuit / ground fault event upload; it can realize the distribution, adjustment, protection and control of power system, and improve the reliability and safety of power system.