In order to solve the 100 kA current transformer error calibration and quantity value transfer and traceability problem

the author introduces the a utilization of ampere measuring principle of large current transformer load excitation current and small school method to determine the 100 kA current transformer error

we begin by measuring a large current transformer secondary winding DC resistance and secondary load excitation current error

then measure the large current transformer basic error in the small current

finally

calculate the linear error turns ratio

and estimate the 100 kA large current transformer actual error

well solve the problem of the value of current difficulties in the field of large current transformers

and through a large number of experimental data proved the feasibility and correctness of the method. The results shows that the method is completely correct

and have a field operational and practical.