(1) When the primary current of the current transformer increases, the error decreases; when the primary current exceeds the rated value several times, the current transformer will work in the nonlinear part of the magnetization curve, and the current difference and angular difference will increase. .

        (2) The secondary circuit impedance Z _{2 is} increased, the influence ratio is increased more, and the angular difference is less increased; the power factor COS φ is decreased, so that the ratio difference is increased and the angular error is reduced.

        (3) The influence of the power frequency on the error is generally small. When the frequency increases, the error in the turn-on time decreases slightly, and then increases continuously.

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