Failure Analysis And Reliability Research For JZ7 Intermediate Relay

Intermediate relay is a type of control undervoltage relay which is used to add the amount of control signal or amplify the signal. The input signal of the intermediate relay is the coil's make-and-break, and the output signal is the action of the contact. With more contact and high capacity, the Intermediate relay was usually used to middle enlarge and convert function in the electric circuit, such as extent amount and enlarge capacity of the contact. Because of its higher off-state insulating property and lower on-state impedance than other device, it's applied broadly in the industry product and various control system. The reliability of intermediate relay is a crucial precondition for increasing the control system reliability.At present, the intermediate relay made in our country with low reliability, can't accord with the control system's reliability request, that result in higher risk in control system' actual run. According to this situation, consulting GB/T15510's request, we carried reliability test on intermediate relay; Record and analysis the intermediate relay's failure insistence with different load and work stage, then conform failure mode; Consider increasing the intermediate relay reliability from the relay's frame structure and material, contact structure and material, and other assistant material(such as contact lubricant) etc.; Put forward the measures for encouraging the reliability of intermediate relay.The failure analysis of this article gets lots of subjects and theoretics involved, such as electrotechnics, mechanics, materials science, reliability theory and electric contact theory. It's a complicated work to go with. The reliability of the intermediate relay can be increased. This subject not only can bring economic performance for the business enterprise, but also have social performance.