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I was assuming (I know) that he had 6-500 MCM conductors per phase. If that is the case then he has a signifacant difference in lead length since the conduits have to be spread apart. We dont know how many bends, junction boxes that his feeder runs through so we don't have realistic idea of the...

The way your proposing will result in a hugh stress on the mechanical system when you go across line because you cannot syncronize the phase angle between the motor and the untility. Use a soft start to ramp up to full speed and then the bypass contactor will pull in and the soft start will...

must have missed something early in the post. He has 6 wires per phase/ 3 phases / ? conduits. Each conduit has an equal number of phase A, B and C conductors. Yes measuring different conductors would result in different currents because of different loading on each phase. Also he never...

Someone is asking for a lot of conflicting requirements. Snap for open to close in .1 second Be able to regulate the flow in between ( is this also in the .1 sec requirement also?) I dont' think you are going to find a flow meter that can respond that fast. As for your torque requirements you...

Any motor shop that winds large motors (high voltage) should be able to answer the questions you are asking. The manufacturer is finding all the stuff that we did as standard requirements when we rewould high voltage motors. The varnish should be done in a vacumm/pressure tank. This uses vacumm...

Do you have a line reactor on the OUTPUT side of the VFD going to the motor... One poster was correct the current has to go some where, that is while the chassis of the motor, vfd and the gounding conductor coming in on the supply all have to be bonded, especially between the motor and VFD. If...

Questions: Have you checked the voltage to ground on the inputs? Are two inputs to ground higher than the third? Is the low voltage leg to ground the one with no current? Have you removed one of the legs that have current to see if the one without current starts working? With 2 legs higher...