How to Measure Stator Winding Continuity

shanrta; you use the megger to check the the stator winding to to ground, or the metal frame of the generator for leakage or resistance, you would use a kelvin bridge to check the windings of the stator. perry

Thanks for your reply. Could you please explain it to me further. Suppose if the generator is a shipborne one then how to use the megger at that time. Because I have an assignment to prepare

• A continuity tester is all that is needed to check the windings.
• A Megger is used to check the insulation resistance.

These are two different tests.

hi.

its better you to used a common multi tester than to used a megger tester.

its simple and easy to find out if your winding is in trouble one tip for you if you have a fluke digital tester it better and recomended by all....

more power....

As stated several times already, a megger is the wrong tool for this job!!!

If this is school homework then your question was fine, but if your question was due to actually needing to do this work on a ship, please go and find an electrical engineer to show you how its done.....your knowledge level is too low.

Hi Andy.

Could be some confusion as some meggers have continuity testing also.

I realised that too, but then he should have mentioned that he was aiming to use that part of the Megger, not the "Megger" part!!! We do not have Crystal Balls here.....

What happened to a good intelligent answer that instructs rather than an arrogant answer? R u that full of your self?

I should point out that if this is your answer to this forum maybe you should apply this answer to yourself. As a guest your comments do not rate to the same extent as a registered member, we do try to keep it polite even if it hurts. perhaps you can give a good answer to the posters question it is not a very difficult one, but as pointed out it is so basic one would have to wonder why it was asked at all.

Well I am far more sure of myself than you are Troll!!! Which is not hard really!!!

Continuity can be measured with an Ohm-meter. Megger (Mega-ohm-meter) is for determining the wire insulation dielectric resistance ( short-circuit or weakened insulation between wires and/or wire-armature), as PWSlack pointed out.

The value of the resistance measured has to be compared to the manufacturer's measured resistance, taking into account eventual temperature difference at the measuring moment. The measured part of the winding has to be be done after isolating that part completely from any connection, bridge, etc.

With regard to using a megger, I do not see any other way to determinate if any wire insulation damage occured, irrespective if it is a terrestrial or ship based generator.

Hi Shantha,

Perry's answer is absolutely correct however it is unlikely that you will have a Kelvin bridge aboard. Your megger will have a continuity setting which typically will read to 0.01Ω (unless it is very old) but this will not be sensitive enough. On the assumption that you are referring to a three phase unit there is a practical cheat way to check the winding continuity and integrity.

Use a 12 or 24V battery and a lamp. connect these in series with each winding in turn and measure the voltage drop across each winding. MAKE SURE that your test probes are connected directly to the winding terminals and not the battery lamp wires. You should get the same reading on each winding. If you measure the current taken by the bulb you can use Ohm's law to calculate the resistance.

If you are measuring the windings for earth leakage then remember that the neutral will be grounded and this has to be removed before you can do the test with the megger.

I hope this helps

Chas

GA as I like the post and its simple but good/clever idea.......