Identification method of fault current during starting process of asynchronous motor
A technology for asynchronous motors and fault currents, applied in the field of power systems, can solve problems such as inverse time overcurrent protection that cannot be put into operation reliably, and achieve the effects of protecting reliable operation, avoiding expansion, and improving sensitivity
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[0017] The preferred embodiments of the present invention are given below in conjunction with the accompanying drawings to describe the technical solution of the present invention in detail.
[0018] During the normal starting process of the motor, the starting current remains high until the end of the starting process. At present, the voltage-current phase algorithm is used to provide action criteria for the protection device by identifying the relationship between the voltage and current during the starting period. However, according to a large number of The actual wave recording of the motor found that during the start-up period, the phase difference of the voltage and current fluctuates, and the change has no obvious characteristics. According to the principle of the motor, during the start-up process, as the slip s gradually decreases, the induced potential generated on the rotor due to the existence of the slip and the demagnetization effect of the corresponding induced c...
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