Dummy Load (3)
According to our simulations the expected ripple will be in the order of tens of mA pp with a single TF coil, which is well below your ripple requirement of +/-0.1% (85 A pp) for a 48 mH load.
Please note that some key parameters of the TFPS have been set by the specification; at least 12 pulse rectifier (this requires line reactors), no load secondary voltage of the transformer, short circuit voltage of the transformer… With these parameters the output DC voltage (with load) is about 80 V so the maximum dummy load resistance for 42.5 kA is 80/42.5 kA = 1.8 mOhm. The challenge is manufacturing a normal conducting coil of 2mH with a 1.8 mOhm resistance.
As the current ripple on a 2mH load only varies from 4-5A pp with different load currents (from 10 to 42.5 kA)
Can the factory acceptance test be performed on a dummy load of 2mH at a lower current, between 10 and 15 kA, and complete the acceptance with calculations and simulations.”?