DEVICE TO MEASURE ACTIVE RESISTANCE OF ELECTRICAL EQUIPMENT WINDINGS Russian patent published in 2013 - IPC G01R27/08 

FIELD: electricity.

SUBSTANCE: device for measurement of active resistance of electrical equipment windings comprises a power supply unit, a current stabiliser, the output of which is connected with one end of the winding, the other end of which via a unit of current normalisation is connected with the second pole of the power supply unit, and potential outputs of the current normalisation unit are connected to an input of an analogue-digital converter; a unit of voltage normalisation, to the input of which both ends of the winding are connected; a microprocessor, to inputs of which there is an output of the analogue-digital converter and a keyboard connected, and outputs of the microprocessor are connected with a display, with the input of voltage division coefficient control of the voltage normalisation unit, with the input of the current normalisation unit and with the input of the current stabiliser control for setting the current, the value of which is automatically calculated on the basis of preliminary measurement of the value of active resistance of the winding. At the same time between the first pole of the power supply unit and the input of the current stabiliser there is a pulse voltage stabiliser connected, the input of output voltage value control of which is connected with the microprocessor output, and the current stabiliser is arranged in the form of a linear current stabiliser, and additionally there is the second analogue-digital converter introduced, the input of which is connected to the output of the current normalisation unit, and the outlet of the second analogue-digital converter is connected to the microprocessor input.

EFFECT: expansion of temperature ranges of device functioning, increased accuracy of measurements of active resistance of windings.