FIELD: electrical equipment.
SUBSTANCE: invention relates to electrical engineering and can be used in determining dry heating time constant of dry transformers. Method for determination of dry transformer heating time constant includes short circuit of low-voltage winding to ammeter, setting current value of low-voltage winding close to rated value, measurement of three values of this current and voltages of the primary winding through equal time intervals and calculation of the heating time constant by formulas containing values of voltages measured at the moment of currents measurement.
EFFECT: technical result is possibility of accurate determination of heating time constant of dry transformer in conditions of supply voltage oscillation.
1 cl, 1 tbl
