How to megger a 80 DGDA Onan Cummins generator
How to megger a 80 DGDA Onan Cummins generator
(OP)
I need help on getting some information on how to megger the stator windings on the above mentioned model generator.
Thank you
Thank you
When was the last time you drove down the highway without seeing a commercial truck hauling goods?
Download nowINTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS Come Join Us!Are you an
Engineering professional? Join Eng-Tips Forums!
*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail. Posting GuidelinesJobs |
How to megger a 80 DGDA Onan Cummins generator
|
RE: How to megger a 80 DGDA Onan Cummins generator
Meggar is basically measurement of insulation resistance of the machine. The meggar leads are to be connected between the terminal & earth and the readings noted. Obviously, it is done with the machine isolated. Incase the neutral is connected to earth, either directly or through a neutral grounding resistor, that needs to be isolated before the testing. The insulation resistance value will stabilize in few minutes. If it is a big machine the reading is taken over 10 minutes. Small machines, even 1 minute readings can be considered sufficient.
Depending on the voltage rating of the generator, the meggar voltage will vary.
Hope that answers your question.
Anand Sekhar
RE: How to megger a 80 DGDA Onan Cummins generator
1:> disconnect the grounding jumper if present.
2:> Disconnect the Automatic Voltage Regulator leads.
3:> Disconnect the wiring to the panel meters (Voltmeters, Power Meters and anything with a voltage connection.
4:> Consider disconnecting the leads to the main circuit breaker.
5:> There should be nothing connected to the windings except other windings, and possibly the main breaker if that is your choice.
You may megger the windings as a group, or choose to megger them individually. Group checking is fast. Individual checking may show up a winding with a much lower resistance to ground than the others even though it is acceptably high. The choice of methods depends on the reason for the test in the first place.
respectfully