METHOD TO DETERMINE RESISTANCE AND INDUCTANCE OF SCATTERING OF PRIMARY WINDING OF VOLTAGE TRANSFORMER Russian patent published in 2013 - IPC G01R27/26 

FIELD: measurement equipment.

SUBSTANCE: in the available method of measurement of inductance of scattering of the primary winding of the voltage transformer as product of the time constant of the transition process τ and active resistance of the oscillographed R_c, circuit L_σ2bh=τ·R₁₁, consisting in measurement of parameters of the second section of the transition process of current as output voltage jumps on one of phases, according to the invention the secondary winding of the same phase is shorted, the voltage surge is sent from the voltage source with negligible resistance to the primary winding, inductance of scattering is determined, as well as resistance of the primary winding of the voltage transformer, the transition process is considered in the form of three exponents, in accordance with the expression $$i_1\left(t\right)=U_1\left(\frac{1}{2R_m}\left(1-e^{\frac{-t}{{\tau }_1}}\right)+\left(\frac{1}{2R_a}-\frac{1}{R_m}\right)\left(1-e^{\frac{-t}{{\tau }_2}}\right)+\left(\frac{1}{2R_a}+\frac{1}{2R_m}\right)\left(1-e^{\frac{-t}{{\tau }_3}}\right)\right).$$

EFFECT: possibility to determine both inductance of scattering of a pair of voltage transformer windings and resistance of a pair of voltage transformer windings, at the same time the transition process is considered in the form of three exponents, which helps to more accurately determine transformer parameters.

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