Method and device for online monitoring and positioning turn-to-turn short circuit for rotator of water wheel generator

Abstract

The invention discloses a method and a device for online monitoring and positioning a turn-to-turn short circuit for a rotator of a water wheel generator, belongs to monitoring and protecting technology of the rotator of the water wheel generator, and aims at providing three types of methods and devices capable of carrying out online monitoring and positioning of the turn-to-turn short circuit for the rotator of the water wheel generator. The method comprises the following steps: synchronously acquiring inductive potential waveform of numbered and positioned magnetic poles through an induction coil in real time; sending the inductive potential waveform to a microcomputer and calculating an average value ep of a peak value of magnetic pole inductive potential, a pole average value vp; and comparing the smallest peak value e min of the inductive potential and the smallest pole value v min of the inductive potential with the ep and vp and making the judgment. The device comprises a positioning identification label (11), first and second separated circuits (13, 7), the microcomputer (3), a position sensor (12), a filtering amplifying circuit (8), an A / D transferring circuit (4), a magnetic pole induction coil (9), a frequency dividing circuit (15), a wave-shaping circuit (16) and a display (5), and a device is additionally provided with two pole amplifying circuit (6) on the basis of the devices.

Description

Technical field: [0001] The invention relates to three methods for on-line monitoring and positioning of inter-turn short-circuits of generator rotors, in particular to three methods for on-line monitoring and positioning of inter-turn short-circuits of hydraulic generator rotors; the invention also relates to devices respectively implementing the above methods. Background technique: [0002] In current generator rotor turn-to-turn short-circuit technology, there are many studies on turbogenerators, but few studies on hydroelectric generators. Since the turbogenerator is a hidden pole type, there are only two magnetic poles, and the inter-turn short circuit is reflected in the slot of the rotor; while the hydroelectric generator is a salient pole type, there are many magnetic poles, and the inter-turn short circuit is reflected in the rotor slot. within the magnetic pole. The number of turns in the rotor slot of the steam turbine generator is relatively small, generally onl...

AI Technical Summary

Problems solved by technology

However, due to the very low resistance of the rotor winding, it is difficult to find inter-turn short-circuit faults by method ①; affected by the accuracy of the measuring device, it is also difficult to find inter-turn short-circuit faults by method ②

Method ③ Although inter-turn short-circuit faults can be found, it can only be carried out when the power grid is out of operation or shut down for maintenance, and cannot be detected dynamically; even so, a lot of time must be spent to find the specific location of the short-circuit point, which will undoubtedly seriously affect the generator economic benefits

[0005] At present, there is no method for on-line monitoring and locating inter-turn short-circuit faults of hydro-generator rotors, and there is no device capable of on-line monitoring and locating of inter-turn short-circuit faults in hydro-generator rotors

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