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Tuxedo Have you considered the possibility that the fault is occurring as the breaker trips? By this I mean that the new breaker protection is causing it to trip on overcurrent (due to incorrectly set protection not allowing for transformer inrush current). The rapid breaking of current to...

Thanks for replying jbartos & Lewish - I'll check out the websites and investigate Matlab some more.

I wish to model a large AC/DC thyristor converter and DC motor for a load flow study. Can anyone point me to any web resources which may get me started on this? I want to be able to find out (using the motor's test data and specification sheets) the following: 1. System speed/torque curves...

Hi, thanks for replying. The armature current in each direction is approximatley 5900 and 6300 amps respectively. This is with an equal current limit on the field converter in both directions. The current limiting protection will trip the DC converter if the current exceeds 6200 A for more...

I have a 2800 kW separately excited bidirectional DC motor which is drawing more armature current in one direction (when accelerating a given load) than in the other. Field current limits are identical in both directions. The armature converter is a series/parallel conencted device, which can...