Electromagnetic PT error calculation method

The invention provides an electromagnetic PT error calculation method which comprises the following steps: establishing a PT circuit model, and establishing a mathematical model of a PT absolute errorvector and a relative error complex number by utilizing the PT circuit model; calculating a PT complex error by using a mathematical model of the absolute error vector and the relative error complexnumber; carrying out polar coordinate-to-rectangular coordinate conversion operation on the PT complex error by utilizing the PT complex error, so that the PT complex error is decomposed into a corresponding real part and an imaginary part; determining the corresponding relation between the PT ratio difference and the real part of the PT complex error and the corresponding relation between the PTangle difference and the imaginary part of the PT complex error; and analyzing influence quantities of voltage characteristics, load characteristics and load impedance angle characteristics. Accordingto the electromagnetic PT e