External current generator for on-site calibration of electric energy meter and parameter determination method thereof

Abstract

The present application relates to a kind of external current generating device for electric energy meter field verification, including magnetic core, voltage dividing resistor, power supply, primary fuse, secondary fuse, primary winding and secondary winding;It also relates to a kind of parameter determination method, including determining the current effective value size and turns ratio of primary side and secondary side;Determine the wire gauge of primary side and secondary side;Preliminary calculation voltage dividing resistor design value;Determine the size of magnetic core and the number of turns of primary winding;Calculate the resistance component of primary impedance and primary impedance;Calculate actual primary current value;Compare the deviation of actual primary current value and primary current effective value, when the deviation of actual primary current value and primary current effective value I1 is not higher than 5%, then obtain the final design result of each parameter of device.The present application provides convenience for field verification work, and also saves the expenditure of replacing new equipment for power supply unit.

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