METHOD FOR DETERMINING PARAMETERS OF T-SHAPED EQUIVALENT CIRCUIT OF ONE-PHASED TRANSFORMER IN WORKING MODE WITH THIRD WINDING FREE OF LOAD

摘要

FIELD: electronics.;SUBSTANCE: in accordance to method, with known power source frequency, number of transformer coils, registered are arrays of instant values of input voltage, input current, output voltage, output current, voltage in third winding for one and the same time moments t_j=t₁,t₂,...,t_N, where N=T/Δt - number of partitions within period T, Δt - discontinuousness of arrays of instant values. Formed further are arrays of instant values of output voltage, output current, third winding voltage, modified for primary winding of transformer. Formed after that are arrays of instant values of voltage on first longitudinal branch of equivalent circuit, as difference of arrays of input voltage and voltage on third winding, modified for primary winding; on second longitudinal branch of equivalent circuit, as difference between arrays frequency voltage on third winding, modified for primary winding, and output voltage, modified for primary winding. Then, array of instant values of magnetization current is formed, as difference between arrays of input current and output current, modified for primary winding. Further on basis of known arrays of input voltage and input current; output voltage modified for primary winding and output current modified for primary winding; voltage on third winding modified for primary winding, and magnetization current, formed are arrays of instant values of active powers in first, second longitudinal and transverse branches of equivalent circuit, by taking which into consideration average active powers of these branches during a period are determined. Further, points of combined solution of arrays of instant voltage and instant current are formed; output voltage modified for primary winding and output current modified for primary winding; voltage on third winding modified for primary winding, and magnetization current, and determined respectively are reactive powers in first, second longitudinal and transverse branches of equivalent circuit. Then on basis of arrays of instant values of input current, output current modified for primary winding and magnetization current, squares of their active values are determined. By taking into consideration values of active and reactive powers determined above and squares of appropriate current values, active and reactive resistances of equivalent circuit of one-phased transformer, being parameters of T-shaped equivalent circuit, are determined, which are accepted as final results.;EFFECT: creation of method for determining parameters of T-shaped equivalent circuit of one-phased transformer without putting it out of working mode.;3 dwg, 3 tbl