TEST BENCH FOR ASYNCHRONOUS MACHINES AND THEIR LOADING METHOD Russian patent published in 2019 - IPC G01R31/34 

FIELD: electrical engineering.

SUBSTANCE: invention relates to electrical engineering and can be used for testing asynchronous machines and their loading method. Test bench comprises a coupling mechanically connecting the shafts of two asynchronous machines, a frequency converter with a DC link and two controlled rectifiers-inverters. Power inputs of the first and second controlled rectifiers-inverters are connected to the mains. Output of the first rectifier-inverter is connected to the DC link, and the output of the second rectifier-inverter is connected to the stator winding of the first asynchronous machine. Bench is added with setter of parameters, contactor, frequency calculator of supply voltage, control system, current sensor, rotation frequency sensor. Method of loading asynchronous machines, which are part of stand, consists in the fact that at switched off winding of stator of second asynchronous machine from network by means of contactor from output of second controlled rectifier-inverter to stator winding of first machine alternating voltage is supplied with gradual increase of its frequency from zero value. Speed of AC voltage frequency increase is set by control system in accordance with data received from current sensor and supply voltage frequency computer and entered into parameter setter. When voltage AC voltage supplied to the stator winding of the first machine reaches the value equal to the mains voltage frequency, the stator winding of the second asynchronous machine is connected to the network by means of a contactor. Further, frequency of AC voltage supplied to the first asynchronous machine is reduced, which leads to increase of its load in generator mode and load of the second asynchronous machine in engine mode. Speed of reduction and final value of frequency of alternating voltage supplied to the first asynchronous machine is set by control system in accordance with data received from current and rpm transducers, frequency calculator of supply voltage and parameters entered into setter.

EFFECT: higher reliability of the bench due to exclusion of the possibility of overloading of the tested and loading machine during their loading.

2 cl, 1 dwg