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  • Users: leachdor
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  1. leachdor

    Resistive Load Safety

    I appreciate your concern. As it wasn't meant to be rude, no need to be defensive on my end. :-) (Personally I would have reserved that portion for a private message as a professional courtesy though.) To alleviate some concern, I will be passing the design by another engineer before...
  2. leachdor

    Resistive Load Safety

    Another design theory question here... My application is going to rectify 480vac 3phase to 648VDC and send it into a dummy load. The load is 13Ohms, with 50Adc load, 32.5kW dissipation. I'm designing the control now, that the user will interface with. I suppose my question is theory, is it...
  3. leachdor

    Supply Bus Isolation Advice

    Ripple was made reference to by another engineer here. He will be out of the office till next week, but its something that needs to be figured out by Friday. He seemed quite confident, one of those responses that he just assumes everyone knows...lol. Apparently when the fuses blow on our bus...
  4. leachdor

    Supply Bus Isolation Advice

    Hi I've got a situation where I will be drawing 255A from a 3-phase power bus. I'd like to use good design practice in its implementation, and I'm still in the learning process for power electronics. (computer engr. here) I'd like a level of protection between the bus and the load. Correct...
  5. leachdor

    Resistor Wattage - How Long Sustainable?

    To answer a few questions... We have 480 3phase going into the rectifier assembly, 640Vdc out per built in rectifier. Currently the rectifier assembly has 2 rectifiers built in, with the potential for 5 down the road. The test procedure hasn't been confirmed, but the most demanding...
  6. leachdor

    Resistor Wattage - How Long Sustainable?

    Hi All, I've got a project that uses a rectifier, and outputs to 5 locations. I need to build a load cell for each output. The resistance value will be 13Ohms. Power dissipation through each load will be 32.5KW for roughly 15 seconds. My question is, how would you go about selecting a...

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