Broad width metering current mutual inductor

The utility model discloses a broad width metering current mutual inductor, including big, the little transformation ratio current transformer who locates in -phase bus to mechanical connection and electric isolation are realized to resin through casting among them, the terminal is changed in broad width measurement by current transformer switch unit and controlling means constitute, the current transformer switch unit includes that current transformer is changed to the transformation ratio, CT switches detection current transformer, is used for the generating line side current transformer switching of two transformation ratios to use the controllable switch device, first, the 2nd controllable switch device is connected with controlling means respectively, controlling means for program control can be first, the switching on and closing of the 2nd controllable switch device, controlling means is connected with the power. The utility model discloses can the automatic switch -over electric power mutual -inductor