Multi-factor aging stress control platform and method for stator bar of large hydro-generator

Abstract

The invention discloses a multi-factor aging stress control platform and method for a stator bar of a large hydro-generator. The multi-factor aging stress control platform and method can be used for truly reproducing a stator bar real-machine aging process in a laboratory. The platform can realize multi-factor aging stress control for simultaneously applying three aging factors of electricity, heat and machinery to the whole stator bar of the large hydro-generator. The stator bar is heated by the heating plate and is subjected to closed-loop control by the temperature control box. The electrical aging factor is provided by the transformer, and closed-loop control can be carried out on the electrical aging factor through the transformer. Mechanical aging factors are provided by the vibration exciter and can be subjected to closed-loop control by the intelligent signal generator. The three aging factors of electricity, heat and machinery can be controlled by the platform in a closed-loopmanner, the platform can meet the aging test requirements of different stator bars of a large hydro-generator, and a foundation is laid for researching the insulation aging rule and service life prediction of the stator bars.

Description

technical field [0001] The invention belongs to the technical field of large hydraulic generators, and in particular relates to a multi-factor aging stress control platform and method for stator wire rods of large hydraulic generators. Background technique [0002] The operational reliability of hydroelectric generators plays an extremely important role in the normal operation of the power system, especially the safe production of the national economy. The stator bar is the main component of the stator winding system of the hydro-generator, and its performance is directly related to the operation reliability, life and technical and economic indicators of the unit. During the operation of the motor, the stator winding will be gradually damaged by the synergistic effects of multiple factors such as electricity, heat, and machinery, and the insulation and mechanical properties will gradually deteriorate. When the insulation level is severely degraded, it will cause generator f...

AI Technical Summary

Problems solved by technology

However, applying three aging factors at the same time requires high equipment, and it is difficult to require that the three aging factors do not affect each other.

At present, single-factor accelerated aging or two-factor sequential aging are commonly used, but neither of these two aging methods can truly reflect the aging process of stator bar insulation under actual working conditions.

Moreover, the existing methods can only perform aging on local stator bar samples, rather than on the entire stator bar.

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