FIELD: electricity.
SUBSTANCE: arrays of instantaneous values of primary winding current and voltages of primary and secondary windings of each transformer phase are registered for one and the same moments of time. Active value of current for each phase, active values of primary and secondary windings and phase shift angle between voltages of primary and secondary windings are identified. Active current value of primary winding is reduced to rated voltage of primary winding and rated grid frequency. Active values of active and reactive components are defined for reduced current of primary winding. Packages of basic data are generated on angle of phase shift between voltages of primary and secondary windings, active values of active and reactive components of reduced current in primary winding for three various loading modes of transformer. This data is used to identify coefficients of characteristic plane equation. Then arrays of instantaneous values of primary winding current and voltages of primary and secondary windings for any loading mode of transformer operation are used to identify angle of phase shift between voltages of primary and secondary windings, active values of active and reactive components of reduced current in the primary winding. Active values of active and reactive components of reduced current in the primary winding and coefficients of characteristic plane equation are used to identify value of control angle of phase shift between voltages of primary and secondary windings and deviation of current mode phase shift angle from value of control phase shift angle. Value of this deviation is used to generate signal on change in transformer technical condition.
EFFECT: improved reliability and accuracy, possibility of operative information provision.
2 dwg, 3 tbl
