METHOD FOR OPERATING A CENTRIFUGAL PUMP DRIVEN IN TURBINE MODE

摘要

The invention concerns a procedure for operating an electric motor powered by a frequency converter of a circular pump (2) in a turbine case, the circular pump (2) having at least one wheel (12) from the electric motor in a normal operation for the purpose of determining a liquid medium from a suction side (9) turns to a pressure side (10) of the circular pump (2) in a forward direction with positive speed,and where, in the case of turbines, the medium passes through the circular pump (2) under drive of the wheel (12) in a reverse direction with negative speed (n1) from the pressure side (10) to the suction side (9). After switching on the circular pump (2) in the case of turbines, the electric motor is driven with such a negative torque, that the speed of the running wheel is equal to or greater than the negative speed due to turbine failure (n1). The invention also concerns a circular pump unit with a regulation (6) to carry out the procedure.