METHOD FOR DETERMINING QUALITY OF COMPOUNDING OF ELECTRIC MACHINE WINDINGS Russian patent published in 2014 - IPC G01R31/06 

FIELD: measurement equipment.

SUBSTANCE: invention relates to electrical measurement equipment and is intended to determine the quality of compounding of electric machine windings at test stages of winding insulation at manufacture and operation, and namely of stator windings of oil-filled submerged asynchronous electric motors. Essence of the invention is as follows: constant voltage U is supplied to a measurement object and resistance R(t) of the object is measured during the period of time, which is sufficient to achieve the resistance value of the practically set value. Then, values of transient current i(t)=U/R(t) are determined. A diagnostic feature of quality assessment of the winding compounding is determined as per the current curve in the form of a product of experimental values of the main characteristics of compound (ε_a·ρ_v)_exp - absolute dielectric permeability and specific volumetric resistance respectively; then, compounding quality criterion K_k is determined by comparing experimental characteristics of the compound to its nameplate data by the following formula: $$K_k=\frac{{\left({\epsilon }_a\cdot {\rho }_v\right)}_{\text{namep}}}{{\left({\epsilon }_a\cdot {\rho }_v\right)}_{\exp }}.$$

EFFECT: improving objectiveness of quality assessment of winding compounding.

4 dwg, 4 tbl