| Abstract |
It is known that the steep voltage changes caused by IGBT frequency inverters can cause overvoltage problems at motor terminals and in the motor winding [1,2,3]. Moreover, due to the distributed phase capacities of the cable, these voltage changes cause a voltage variation in the ground wire [4], which can only be partially eliminated by introducing filters that limit the rate of change of the voltage [5]. These voltages induced in the ground wire can initiate sparks when connected to a grounded system, thus representing a substantial danger when operating in an explosive atmosphere. The paper provides an analysis of the influence of cable parameters, cable length, grounding resistance and motor impedance. |
