Motor overloads
- Thread starter pridelion
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jwelectric
Senior Member
- Location
- North Carolina
Re: Motor overloads
One good use is to go fishing
One good use is to go fishing
stew
Senior Member
- Location
- federal way,washington
Re: Motor overloads
A megger is used to test the insulation quality of wire. It is used also on electric motors and generators to test the insulation qualaity of the windings. It impresses a relativley hi voltage(typically 500 to 1000) dc between the wire and ground. The instrument then gives a reading in ohms(megohms normally unles you have bad wire or insulation) Hence the term megger. Hopes this helps and I wouldnt know how to fish with one.
A megger is used to test the insulation quality of wire. It is used also on electric motors and generators to test the insulation qualaity of the windings. It impresses a relativley hi voltage(typically 500 to 1000) dc between the wire and ground. The instrument then gives a reading in ohms(megohms normally unles you have bad wire or insulation) Hence the term megger. Hopes this helps and I wouldnt know how to fish with one.
friebel
Senior Member
- Location
- Pennsville, N.J.
Re: Motor overloads
Motors, what is a good or bad reading of a motor and/or motor service with a Megger.
I have answered this question a couple of times, and I know that it is in the file, but I will answer it again.
I use the information from the Megger Manuals that I carry in my brief case all of the time for reference. The manuals are: A Stitch in Time, The Complete Guide to Electrical Insulation Testing, featuring Megger Insulation Testers, and the other Manual is: Getting Down To Earth by Megger.
If anyone would like to have the manuals, you may contact me by Private Message and I will direct you to the Company and the person who will send you the manuals.
Now to answer your direct question of "What is a good and/or bad reading with a Megger on a Motor and/or a Motor service.
I will quote the exact verbage from the "Stitch in Time" manual on the readings: Insulation resistance should be approximately one-megohm for each one-thousand volts of operating voltage, with a minimum value of one-megohm.
For Example: A motor rated for 2400-volts should have a minimum insulation resistance of 2.4 Megohms.
I will now give you my personal experience on the information that I have just given to you.
Yes, I would continue to run the above motor at the reading of 2.4 Megohms, but I would be arranging for a shutdown to change out this Motor before it does fail and then it would mean a expensive rewind, versus if we take the motor out of service and give it a good cleaning and a dip in insulating varnish, and new bearings.
Again, if you are interested in the two manuals that I have suggested, please contact me by Private Message, and I will direct you where you can get the manuals.
Motors, what is a good or bad reading of a motor and/or motor service with a Megger.
I have answered this question a couple of times, and I know that it is in the file, but I will answer it again.
I use the information from the Megger Manuals that I carry in my brief case all of the time for reference. The manuals are: A Stitch in Time, The Complete Guide to Electrical Insulation Testing, featuring Megger Insulation Testers, and the other Manual is: Getting Down To Earth by Megger.
If anyone would like to have the manuals, you may contact me by Private Message and I will direct you to the Company and the person who will send you the manuals.
Now to answer your direct question of "What is a good and/or bad reading with a Megger on a Motor and/or a Motor service.
I will quote the exact verbage from the "Stitch in Time" manual on the readings: Insulation resistance should be approximately one-megohm for each one-thousand volts of operating voltage, with a minimum value of one-megohm.
For Example: A motor rated for 2400-volts should have a minimum insulation resistance of 2.4 Megohms.
I will now give you my personal experience on the information that I have just given to you.
Yes, I would continue to run the above motor at the reading of 2.4 Megohms, but I would be arranging for a shutdown to change out this Motor before it does fail and then it would mean a expensive rewind, versus if we take the motor out of service and give it a good cleaning and a dip in insulating varnish, and new bearings.
Again, if you are interested in the two manuals that I have suggested, please contact me by Private Message, and I will direct you where you can get the manuals.
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