Study and reliability analysis on testing instrument for dynamic contact resistance on contact

In this paper, a new testing instrument for dynamic contact resistance of low capacity contacts is introduced in detail. By means of this testing instrument, we carried out a series of experiments. In early experiments, we tested several types of industrial control relays under different temperatures and operation times, and accumulated a great deal of experimental data. By statistical analysis of the test data, we drew some qualitative conclusions. Further experiments and reliability analyses are ongoing. A mathematical model of the contact resistance of electrical apparatus contacts and its dynamic changing principle are preliminarily discussed.