There's another issue to be aware of. See Section 6.2 of ANSI/IEEE C62.21-2003 which states that grounding the shield at the motor end only is helpful to reduce voltage surge levels at the motor. Further explanation is given within the standard, as well as some advice on how to balance this...
I don’t have any first hand experience with this, since it’s not our normal practice in this company. However, I had a conversation with a large motor supplier last year about it. This particular supplier said they have equipment to do a spray test, but not a submerged test. The spray test...
"If a few strands break (but not all), do we expect arcing? What would be the mechanism?"
That's a good question. I believe the mechanism might be based on the fact that when you postulate a broken or damaged strand, it is typically not a clean break with a large gap. It could start with...
My first impression after going over the info provided is that it's more likely that the problem started within the conductor. I agree with you that generally it would not seem likely because their is no joint there. However, the evidence indicates a conductor problem. Reason - if it was an...
I'm looking for any experience feedback or comments on the use of induction motors in the range of 10,000 hp - 25,000 hp, at any speed. I'm not concerned about starting methods, etc, since we can design the system to adequately take care of starting. I'm more concerned about machine issues...
Aluminum panel enclosures would help. Although there are still induced currents, the nonmagnetic nature of the material greatly reduces the heating from hysteresis. Not sure how could quantify this.
