METHOD OF CONTROLLING WINDING INSULATION DEFECTIVENESS Russian patent published in 2020 - IPC G01R31/08 

FIELD: monitoring and measuring equipment.

SUBSTANCE: invention relates to instrumentation, and can be used, for example, to control winding insulation defectiveness. Novelty is that in the winding insulation defect monitoring aid, consisting in the defect sensor voltage supply, and in the defect pulses formation, duration T_i of which is determined by the discharge burning time between the live wire and the defect sensor electrodes during the defective wire insulation area passage in the core of the defect sensor, in the process of monitoring in the sensor area, high intensity of the electric field is initiated by creating in the said region a sharply inhomogeneous field, for which the defect sensor is made in the form of a ring, along the inner circumference of which there are radially and uniformly arranged electrically conductive micro-filaments, the axes of which are directed perpendicular to the axis of the monitored wire, wherein the ends of the microfilaments are arranged in a circumferential direction surrounding the monitored conductor so that they lie on a circle whose diameter D is connected to the diameter of the monitored wire d by the ratio d≤D≤1.2d, in the process of monitoring continuously generating pulses, the frequency of which is changed directly in proportion to the speed of movement of the wire, wherein air space in the defect sensor area is continuously irradiated with ultraviolet radiation, defect sensor before monitoring is pre-calibrated, for which on defect-free area of wire insulation is applied an artificial dotted defect in the form of a puncture to current-conducting core of wire, after which said section of wire is repeatedly drawn through defect sensor and at each subsequent pulling voltage on sensor is increased in comparison with previous drawing, this procedure is carried out until during passage of defective section of wire in area of sensor of defects corona discharge does not ignite, at ignition of which defect pulse is generated with duration of t_c, and counting number of speed pulses k generated in time t_c, after which voltage U_p, at which said corona discharge is ignited, is received as working voltage, and control of wires insulation is performed at specified value of voltage on sensor, wherein during each faulty portion of the insulation through the defect sensor, forming a defect pulse with duration t_i and counting number n_i of generated velocity pulses for said time t_i, and length l_i of each defect is determined by formula l_i=l_e(n_i-k), where l_e is length of elementary section of wire passed through sensor of defects during one generated speed pulse.

EFFECT: technical result when implementing the disclosed solution consists in reducing the control voltage and improving the accuracy of controlling the length of the defects.

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