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Change in Electric Contact Resistance of Low-Voltage Relays Affected by Fault Current

机译:故障电流对低压继电器电接触电阻的影响

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摘要

Contact resistance is an important maintenance parameter for electromagnetic switches, including low-voltage relays. The flow of significant current through electric contacts may influence the contact surface and thus the value of the electric contact resistance (ECR). The change in ECR is influenced not only by the value of current but also by the current phase. Therefore, the impact of the switching short-circuit current’s phase on the ECR was analyzed in this paper. Significant changes in the resistance after each switching cycle were observed. The ECR decreased significantly after each make operation, and a correlation with current amplitude, total let-through energy, and short-circuit time was not observed.
机译:接触电阻是电磁开关(包括低压继电器)的重要维护参数。通过电触点的大量电流可能会影响触点表面,从而影响电触点电阻(ECR)的值。 ECR的变化不仅受电流值的影响,还受电流相位的影响。因此,本文分析了开关短路电流的相位对ECR的影响。观察到每个开关周期后电阻的显着变化。每次接通操作后,ECR均显着下降,并且未观察到与电流幅度,总的通过能量和短路时间的相关性。

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