Unified transformation ratio-type wide metering current transformer

The invention discloses a unified transformation ratio-type wide metering current transformer. The post stage of a small-transformation ratio current transformer on an in-phase bus is parallelly connected with a current reduction-type current converter; mechanical connection and electrical isolation are realized between a large-transformation ratio current transformer, the small-transformation ratio current transformer and the current converter through resin cast between; one output end of the current converter is parallelly connected with one output end of the large-transformation ratio current transformer to form one end externally connected with a watt hour metering device, a CT switching detection current transformer is arranged in the circuit after parallel connection in a passing mode, the output end of the CT switching detection current transformer is connected with a control device via a signal processing and amplifying unit, and the current converter and the other output end of the large-transformati