Evaluation and improvements of the short circuit test at ABB Machines
This thesis was performed to improve the test procedure for large electrical machines at ABB Machines in Västerås. New measurement equipment for the three phase short circuit test was evaluated by implementation and benchmarking against currently used system. A new position for the new measurement system was found to ensure good repetitively between tests, while at the same time reduce setup time from up to an hour to zero. The results from the new position and equipment were satisfactory and further implementation is advised. A new program for evaluation of dynamic parameters (X’d, X’’d, T’d, T’’d) was done in accordance to IEEE, IEC and currently implemented software, using Matlab. By controlling the phase angle of the voltage at time of the short circuit, the current can be minimized. Investigations of how that can be achieved were conducted and test of one solution was performed successfully on a machine.
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