Nuclear power half-speed turbonator exciting winding fault diagnosis device and diagnosis method

Abstract

The invention discloses a nuclear power half-speed turbonator exciting winding fault diagnosis device base don a stator dual-probing coil and a diagnosis method. For the half-speed turbonator generally adopted by the nuclear power plant at present, the coils are arranged at the tops of two stator core teeth with one polar distance therebetween, the diagnosis method can judge the short-circuit fault and fault degree between the turns of the exciting winding according to the frequency domain and time domain features of two coil induced voltages. The device cannot be influenced by a running stateof a generator, and the accurate positioning the fault can be realized. The disadvantage of the prior art can be solved, the fault diagnosis device is more suitable for a diagnosis demand of the nuclear power half-speed turbonator set, and the diagnosis level is improved.

Description

technical field [0001] The invention relates to a fault diagnosis device and a diagnosis method for an excitation winding of a generator, in particular to a fault diagnosis device and a diagnosis method for an excitation winding of a nuclear power half-speed turbo generator, belonging to the technical field of generators. Background technique [0002] The turn-to-turn short-circuit fault of excitation winding is a chronic problem of large synchronous generators. Turn-to-turn short-circuit faults of the excitation winding usually cause severe vibration of the generator. The unipolar effect of the fault may also magnetize the journal of the generator, and the shaft current formed has the risk of burning the journal and bearing bush. The short-circuit fault may develop into the rotor One or two points of the winding to ground fault. These negative factors have seriously affected the normal operation of the synchronous generator, so it is of great significance to realize the on...

AI Technical Summary

Problems solved by technology

[0005] The traditional detection coil method detects the slot leakage flux of the rotor through a miniature radial / tangential coil installed in the air gap of the generator, and judges the turn-to-turn short circuit of the excitation winding based on the correlation between the rotor slot leakage flux and the effective ampere-turns in the slot Faults, this method has the function of fault location and has been widely used. The disadvantage is that the anti-interference ability is insufficient, and the detection sensitivity is seriously reduced under load conditions.

However, this method needs to insert the detection coil deep into the magnetic field of the generator air gap, which brings great potential safety hazards

[0006] Due to the large output power of nuclear power turbogenerators, two pairs of poles and half-speed synchronous generators are usually used, and the excitation system usually adopts a brushless excitation method, and the excitation current cannot be measured

In summary, none of the above-mentioned methods is particularly suitable for the fault diagnosis method of inter-turn short circuit in the excitation winding of nuclear power half-speed turbogenerator. Therefore, it is necessary to improve the diagnosis level of such faults and be more suitable for the application in the field of nuclear power.

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