Hi, apologies to bring up an old thread. However I have to undertake a similar project, and this approach is necessary because the induction motor load is going to be in the hundreds of kW, and the platform being made needs to be scale able, and the potential output power be managed instead of wasted into heat (i.e. being fed back into a system or battery). Thus instead of using giant motors, we need to simulate the load electrically such that we can manage the energy efficiently as well as control load parameters.I find the whole exercise somewhat a little pointless, all relays and are typically chosen or selected to suit their respective loads, if you undersize a relay contact rating, especially for an inductive load, the life of the relay is going to be shortened, whatever the application?
No different for motor loads, this is why as I previously pointed out the use of Special Purpose for repeated inductive motor load switching.
It may be more enlightening to use undersized relays on a high inductive DC load and show the results that can occur when the selection is wrong?
Once those being demonstrated to observe a plasma arc that continues on a miss-selected relay to the point of melting the contact. The observer usually does not forget it.
Also an opportunity to get into Magnetic arc-blowout.
Much more enlightening!
Mod:Created your own thread, link to old.
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