METHOD OF CONTROL OF QUALITY OF IMPREGNATION OF WINDINGS OF ELECTRICAL PRODUCTS Russian patent published in 2015 - IPC G01N27/00 

FIELD: electricity.

SUBSTANCE: according to the method each winding is measured before impregnation and after impregnation for the electric parameters which comprise the resistance of two phases of wye connected winding. The initial temperature of each controlled non-impregnated winding T_id and initial resistances of each of two phases of the winding R_b12, R_b13, R_b23 are measured. Then the named two phases of the winding are supplied alternately by the stabilized current I₀, the value of which is selected depending on the cross-section area S of wire strand of winding, in the range of j_minS≤I₀≤j_maxS values where j_min and j_max - the interval of current density values, allowable for winding wire material. The named current I₀ is passed through the winding within the certain time t₀, selected from the condition 0.01 τ≤t₀≤0.013τ, where τ - is the constant of time of winding warming up, τ = C_bi.calc.×R_tr, C_bi.calc. - calculated equivalent thermal capacity of two winding phases, R_tr. - thermal resistance of the winding. At the moment t₀ the resistance of the named two winding phases R_hb12, R_hb12, R_hb23 is measured again. Then the winding is impregnated and dried. Then again the temperature of the impregnated winding T_ni and the resistance of each two winding phases R_a12, R_a13, R_a23 are measured. Then again alternately the stabilized current I₀ is supplied to each of two winding phases and after t₀ time the resistance of the named two winding phases R_ha12, R_ha13, R_ha23 is measured again, by results of measurements the coefficients of impregnation K_i1, K_i2, K_i3 of each winding phase are determined.

EFFECT: increase of informational content of quality control.

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