Method for measuring degree of turn-to-turn short-circuit fault of rotor and accurately positioning same

Abstract

The invention discloses a method for measuring degree of a turn-to-turn short-circuit fault of a rotor and accurately positioning the same. The method is characterized in that a safe current-constant DC voltage is acted on a static slip ring or axial lead, the voltages of different coils are measured, the voltage or voltage different of different corresponding portions of a two-pole winding of a rotor without turn-to-turn short-circuit fault is equivalent, the number of the coil in which short circuit occurs can be determined preliminarily, the voltage between every two turns is then measured, and the position of the short circuit point and the short circuit degree are calculated according to the voltage value between the short-circuit turns. According to the method of the invention, the Kirchhoff's current law is used to search the turn-to-turn short-circuit fault point of the rotor, the concrete position of the fault point can be determined before the rotor is dismounted for repair, subsequent work scheme is then made in a scientific, reasonable and targeted manner according to the position of the fault point, the maintenance cost and period are greatly reduced, labor, material and financial cost is greatly reduced, and huge economic loss is avoided.

Description

technical field [0001] The invention relates to a method for measuring and accurately locating the short-circuit fault degree between turns of a rotor. Background technique [0002] Turn-to-turn short-circuit faults of generator rotor windings account for a large proportion of rotor electrical insulation faults, and inter-turn short-circuit faults in the rotor need to be dealt with in time. If the specific location of the fault point can be determined in advance, it is possible to deal with it with a small processing cost Inter-turn short circuit fault. In addition, the turn-to-turn short-circuit fault occurs in different parts of the rotor, and its treatment scheme and treatment cost may vary greatly. If the location of the fault point is determined before the repair, the follow-up work plan can be formulated scientifically, rationally and pertinently, and the repair cost and cycle will be greatly reduced, thereby saving a lot of manpower, material and financial resources,...

AI Technical Summary

Problems solved by technology

[0003] The rotor winding DC resistance measurement method can theoretically reflect the inter-turn short circuit fault, but the change in the resistance drop caused by the inter-turn short circuit may be smaller than the error of the tester or temperature conversion and can only be judged qualitatively; AC impedance and loss test , two-pole balance test method, and RSO test method can only qualitatively determine whether there is an inter-turn short circuit but cannot locate it; the voltage distribution method can locate a complete short-circuit inter-turn fault in some cases, but the measurement deviation is large

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