The Recognition Of Turbo-generator Rotor Winding Inter-turn Short Circuit Fault Based On Repetitive Surge Oscilloscope

The turbo-generator inner-turn short circuit of rotor windings is a common fault during operation. If you can not discover the existence of inter-turn short circuit fault will cause the rotor earth, burning the rotor windings and other serious consequences, and there will be a huge threat to the safe and stable operation of the generator. So as soon as possible finding the existence of the rotor inter-turn short circuit and find a useful diagnostic method has important practical significance.This paper describes the generator rotor winding inter-turn short circuit fault mechanisms, and makes a comprehensive analysis of the various existing inter-turn short circuit detection methods, on this basis, using RSO method which is more practical, and make the RSO test on the test unit and dynamic simulation unit. After field testing select a best frequency of the test pulse. In SDF-9unit made a single-ended input pulse RSO test, by analyzing the characteristics of short-circuit fault waveform, proposed the specific methods of judging the location and the level of the inter-turn short circuit; in the same unit made a double-ended input pulse experimental research, analyzed of the specific methods on double-ended input. By shorting the L1-L2-tap of the SDF-9unit, comparative analysis the merits of the two input method of the RSO test. In the MJF-30-6unit made a general study of the specific methods to determine the location and the level of the inter-turn short circuit on the RSO method. By the existing tap confirmed the generality of the method determining short position, through the method of parallel resistors between the C1-C2-tap to simulate the different inter-turn short circuit to verify the specific methods to determine the generality of short circuit level.