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You normally use 2x the rated voltage for megger testing For trouble shooting single phase, i would megger line to ground, line too neutral, neutral to ground. A 240v motor would be tested at 500v, not 1000v
Megger TM1600 Circuit Breaker Analyzer
From what i've read here, it seems most like the fluke 1507/1589 Typically start with the lowest voltage your megger has, starting at 50, 100 or 250 vdc will minimize any chance of damaging equipment The only knock on those flukes are their inability to do accurate pi/dar tests
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Megger phase to ground on the primary, phase to ground on the secondary (with the neutral ground bond lifted) and primary to secondary.circuit breakers Large frame circuit breakers should be meggered in particular after a fault when the cb has operated Megger line to load across each phase, phase to phase line and load and phase to ground. What should the ohms be going from ground to phase on a digital megger
For a good motor should it read around what (400megaohms) When the motor is bad it should read 0 ohms to ground Do not megger anything connected to a vfd I agree that adding a disconnect would be a good idea as i assume the megger test is a preventive maintenance procedure for the motor
You would want an auxiliary contact in the disconnect, on the disconnect mechanism, to prevent the drive from having an output unless the disconnect is closed
A disconnect for a 800 hp motor is going. A megger is used to test the integrity of insulation If you are testing a motor circuit wired to a mcc bucket or a vfd Open the breaker in the bucket or isolated the vfd
Always test your megger first with leads together and leads apart Well thanks for the reply, the test that you mention using the megger on the test with the pump aqnd pimp wiring Spot test, time resistance test since there is no formal data i guess both these would be a good idea And then a ohm check on the windings them selfs
Which someone kindly gave me those numbers.thankyou so if im finding bad readings at the vfd end ( testing pump and pump wiring.
I've never seen anyone hipot 600v cables A megger is a megohmeter, measures insulation resistance A hipot tester basically works the same way, but measures leakage current If you see a fault with the megger, you will see a fault with the hipot
The hipot stresses the insulation weak points at higher voltage levels than the megger will I don't think the hi pot will do anything for you. You can damage this equipment or at a minimum get false readings
