Current measurement device and method facing three-phase four-wire system balanced load

The invention relates to a current measurement device and method facing a three-phase four-wire system balanced load, and belongs to the field of measurement. A rectangular stop block is fixedly connected with one end of a threaded guide rod, the other end of the threaded guide rod is sleeved with a manual rotating handle, a U-shaped frame is in threaded connection with the threaded guide rod, a linear motor is fixedly connected with the U-shaped frame through a motor supporting base, a sensor module is arranged in a sensor adjusting table, the lower end of the sensor adjusting table is fixedly connected with two slidable keys, a pair of linear keyways are arranged in the U-shaped frame, the linear motor drives a threaded lead screw to rotate, the threaded lead screw is provided with two-directional threads and can drive a nut arranged on the threaded lead screw to do reciprocating motion, and the nut is connected with the sensor adjusting table through a screw. Accordingly, an effective value of a three-phas