The induction motor function if there exist slip between the synchronous speed and the actual speed of the rotor. The rotating magnetic field rotates at the synchronous speed in the air gap, however the flux that links to the rotor conductor has less speed than synchronous speed, The difference between the speed is called slip.The slip cause current to flow in the rotor conductor and as a result…Continue
During normal operation of CT, the primary and secondary winding produces mmf which by lenze’s law opposes each other. As the secondary mmf is slightly less than the primary mmf, the net mmf is small. This net mmf is the working/magnetizing mmf of the core of CT.
Now, in case secondary winding is kept open, then secondary current will be zero while the…Continue
The sample is taken out from the transformer tank and the BDV of the oil is checked by BDV tester. The BDV tester is basically a high voltage unit and the voltage can be regulated from 0–70 KV. The tester has two electrodes separated by 2.5 mm distance( 4.00 mm separation units are also available).…