For the field error calibration problems of electronic voltage transformer (EVT) and electronic current transformer (ECT) in smart substation, field calibration methods of EVT and ECT were proposed on the basis of voltage and current comparative methods. The proposed field calibration methods used the communication protocol IEC 61850.Using a 110 kV smart substation as the background, the distribution of EVT and ECT was analysed respectively,and the operation methods of primary devices were described by using the proposed field calibration methods. By studying the working principle of the proposed field calibration methods, the secondary basic principle and working mechanism of the proposed method were studied. Meanwhile, the equivalent mathematical model of EVT's field calibration method was established. The field results not only demonstrate the effectiveness and accuracy of the proposed method, but also show that the tested EVT can be used as 0.2 level power meter transformers and the tested ECT can be used as 0.2S level power meter transformers.