Dielectric stike test
Dielectric stike test
(OP)
We are having several large frame, 4160 volt motors being checked for use in Canada. They've never been used, are 4 years old, have had heaters energized and been rotated on a monthly basis. Is a "dielectric strike test" the same thing as a "megger/polarization index test" or a "Hi-pot"?





RE: Dielectric stike test
That's a new one on me... Maybe we can chalk this one up to the differences in colloquial terminology.
Do you have any idea as to what equipment is used and how this test is to be performed?
I'd think you'd want to open them up for a visual inspection for foreign mater and vermin nests, and then do the polarization index and a winding resistance (for baseline data). If your facility can support a test run, that's a prudent thing, also.
old field guy
RE: Dielectric stike test
RE: Dielectric stike test
Note that a Hi-Pot Test could be destructive .
RE: Dielectric stike test
Sad fact is, though, I have had a 4160-volt motor fail a 2500-volt megger test one minute into the test, so even megger tests can be destructive. Of course, that motor was pretty much gone when we got to it, but it had been running prior to shutting down for "maintenance".
old field guy