Abstract:

An experimental study is carried out on the electrical contact reliability of relay with contact bridge structure under the condition of continuous current loading in high temperature environment.By monitoring the curve of the contact resistance change with power-on time and the degradation trend after several cycles, it is found that the contact resistance has a typical characteristic of gradual increase.Further, by testing the mechanical properties of the reed, it is confirmed that the decrease of the stiffness coefficient of the reed and the imbalance of the contact bridge are the main reasons leading to the increase of the contact resistance and finally the failure of the relay.

Key words: continuous current loading, contact bridge structure, power relay, contact resistance, reed