METHOD OF REDUCING THE ERROR AND INCREASING THE RANGE OF ACCURATE DETERMINATION OF THE PRIMARY SIGNAL OF THE TRANSFORMER Russian patent published in 2018 - IPC H01F27/42 

FIELD: electrical engineering.

SUBSTANCE: field of application: electrical engineering. Transformer has one or several secondary windings located on magnetic cores of different cross-section. Method includes the preliminary construction and recording in the memory of the device of the dependences of the effective value of the primary signal I, constructed from n measurements or from the effective value of the secondary signal A_d1 winding, located on a magnetic circuit of one section, or from the effective value of the secondary signal A_d2 winding located on a magnetic circuit of other section, or from acting values of signals of two secondary windings A_d1 and A_d2. Determination of the real values of the primary signal I of the transformer are determined in operation by fixing k times during the period T and at each current time t_i, i = 1, 2, …, k, t_i = t_i-1 + Δt, where Δt is the sampling interval, Δt = T / k, the instantaneous value of the output signal a_j(t_i) from one, for j = 1, or from the other, at j = 2, the secondary windings of the transformer, varying in time t_i by harmonic dependence, the current effective value A_dji output signal of the j secondary winding, and the exact value of the primary signal I_i transformer at time t_i, necessary for measurement purposes, control and relay protection, are found by the previously recorded in the device memory the dependence of the effective value of the primary signal I from the current effective value of the secondary signal A_dj corresponding to the j secondary winding.

EFFECT: technical result is a decrease in the error and an increase in the range of the exact determination of the primary signal of the transformer.

1 cl, 3 dwg, 1 tbl