FIELD: measuring equipment.
SUBSTANCE: during the implementation of the method, the pressure at the supply line is measured, the instantaneous values of the currents and voltages of the induction motor stator are measured, the three-phase currents and voltages are converted into two-phase components of currents and voltages, and the estimated stator current components are determined. Then, the difference between the estimated values of the stator current components and the current values of the stator current components is calculated, the estimated values of the rotor flux linkage components are determined. Estimated values of stator current components and the rotor flux linkage components determine the electromagnetic moment of the induction motor. Using the estimated values of the rotor flux linkage components and the difference between the estimated values of the stator current components and the current values of the stator current components, the loading moment of the centrifugal pump is determined. Using the electromagnetic moment values of the induction motor and the loading moment of the centrifugal pump, the current angular velocity of the centrifugal pump impeller rotation is determined. The hydraulic capacity of the pump is determined. The actual flow rate of the pumping unit is determined based on the values of hydraulic power and rotor speed. The actual flow rate values of the pumping unit and the pressure on the supply line determine the pressure developed by the pump unit.
EFFECT: increasing the accuracy of determining the fluid pressure of a centrifugal pump with an asynchronous electric drive.
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