地震防災用リレーの接触界面の分析

概要

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Relays for earthquake disasters have been used effectively for protection against fires. In this paper, experimental research was continuously carried out to improve the reliability of relays for earthquake disaster prevention. For a current of about 5mA, the contact resistance increased with dependence on the vibration frequency, but for 1A it did not increase with dependence on the vibration frequency. It was proven that the plastic deformation region of the rough contact surface observed by an atomic force microscope (AFM) becomes smooth under a condition of 822 gal at 0.1A. Therefore, this paper examines the reactions between the values of electric currents and the extent of vibrations sustained by relays, which are there to guard against earthquake disasters, over their life span. With this in mind, the contact resistance was measured and the surface of the contact spot observed, from a micro-meter to nano-meter scale, with AFM. Based on these results, this paper considers how to improve the reliability, stability and usable range of the relays which protect against earthquake disasters.
2006-10-30