Generator Rotor inter turn short test.
Generator Rotor inter turn short test.
(OP)
Dear all,
Recently we did pole comparision test to find out the inter turn short of the rotor winding. It is 210MVA Synchronous Generator. Basically in this test we inject 100V ac in to the rotor winding (with exitation brushes off and rotor stand still)and measure the voltage drop between the positive slip ring and pole cross over of the rotor winding and similarly between -ve slip ring and pole cross over. If there are no interturn short the readings will be same. If you find 5% difference between the readings it shows the inter turn short of the winding.
My question is let us suppose we have one turn short in the winding . If we inject 100V AC and consider rotor winding as a transformer then the shorted turn will act as secondary winding and a huge current will flow thru that turn and may damage the winding more. Can some body give their comments on my thoughts. Please correct me if my understanding is wrong.
Recently we did pole comparision test to find out the inter turn short of the rotor winding. It is 210MVA Synchronous Generator. Basically in this test we inject 100V ac in to the rotor winding (with exitation brushes off and rotor stand still)and measure the voltage drop between the positive slip ring and pole cross over of the rotor winding and similarly between -ve slip ring and pole cross over. If there are no interturn short the readings will be same. If you find 5% difference between the readings it shows the inter turn short of the winding.
My question is let us suppose we have one turn short in the winding . If we inject 100V AC and consider rotor winding as a transformer then the shorted turn will act as secondary winding and a huge current will flow thru that turn and may damage the winding more. Can some body give their comments on my thoughts. Please correct me if my understanding is wrong.






RE: Generator Rotor inter turn short test.
We always used an impulse test. Each coil was isolated and shorted out to a charged capacitor and the waveform was recorded. The capacitor/pole winding becomes an LC oscillator. You will see a very different waveform if there is a short as the period will be shorter and the waveform will be noticably distorted. This test is non-destructive, but takes more set up time.
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If it is broken, fix it. If it isn't broken, I'll soon fix that.
RE: Generator Rotor inter turn short test.
Of course, if you maintain the voltage long enough, you can actually "smoke out" the faulty zone.
RE: Generator Rotor inter turn short test.
RE: Generator Rotor inter turn short test.
RE: Generator Rotor inter turn short test.
RE: Generator Rotor inter turn short test.