A detection method for turn-to-turn short-circuit fault of generator stator winding

Abstract

The invention discloses a method for detecting a turn-to-turn short circuit fault of a stator winding of a generator. The method comprises the following steps: 1) collecting current signals of a three-phase winding of a stator by means of a current transformer, and outputting the current signals to a collector; 2) comparing the current signals of the three-phase winding, and determining a phase where a turn-to-turn short circuit fault of a stator winding is located. In a further improvement of the invention, a method for calculating a short circuit fault degree m using a ratio of three-phase currents Ia1, Ib1 and Ic1 in case of a short circuit fault on the basis of determining the phase where the turn-to-turn short circuit fault of the stator winding is located is also disclosed. The technical solution disclosed by the invention can simply, quickly and reliably determine the turn-to-turn short circuit fault of the stator winding inside the generator, the defects of a traditional diagnosis technology having the main characteristic of rotor vibration are overcome, and the generator is convenient to maintain and repair.

Description

technical field [0001] The invention relates to a method for measuring the orientation and degree of an inter-turn short-circuit fault of a stator winding inside a generator, and belongs to the technical field of detection. Background technique [0002] Stator winding turn-to-turn short circuit is a common fault of generators, which may be induced by aging insulation, overvoltage shock and mechanical vibration, etc. Turn-to-turn short circuit fault will cause a significant increase in short circuit current. If it cannot be found and dealt with in time , it is easy to develop into a grounding short circuit fault, causing serious accidents. [0003] In the multi-phase multi-branch synchronous motor, the inter-turn short circuit of the stator winding can be divided into the same branch short circuit, the same phase different branch short circuit and the out-of-phase short circuit. Short circuit, in actual operation, most turn-to-turn short circuits are on the same branch and a...

AI Technical Summary

Problems solved by technology

[0002] Stator winding turn-to-turn short circuit is a common fault of generators, which may be induced by aging insulation, overvoltage shock and mechanical vibration, etc. Turn-to-turn short circuit fault will cause a significant increase in short circuit current. If it cannot be found and dealt with in time , it is easy to develop into a ground short-circuit fault, causing serious accidents

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