Abstract
In order to diagnose the ablation characteristics of circuit breakers, the dynamic contact resistance measurement (DRM) has been proposed for almost 20 years. The dynamic resistance curves are easily influenced by two factors: injected current and opening velocity. The two factors are greatly affected the curves and may led a wrong diagnosis in DRM tests. Through analysis of the influence factors, an experimental model is used to simulate the opening process of the breaker in this study. The effective contact area of contact finger which is used in the experimental model under different velocities and current are measured by using the laser scanning microscope. The measurement proves that the changing of effective contact area plays determinative roles in the influencing of injected current and opening velocity. Then, the kernel partial least squares regression method is used to establish the model formula between influencing parameters and the dynamic contact resistance to realise the prediction of the dynamic contact resistance curves. Furthermore, the prediction model also can be used in other current carrying dry sliding friction conditions.
Published Version
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