Title :
Transmission of voltage signals through serially connected relay contacts
Author_Institution :
Iskra Kibernetika, Kranj
Abstract :
When more than one switching contact in series transmits electric signals, more failures are expected due to increased probability of high contact resistance. The contact resistance (CR) distribution for an individual contact in the high-resistance area has a major influence on the reliability of transmission. When contacts operate in ambient air, they are exposed to contamination (which affects the CR distribution in the tail) so that the amplified effect of contamination on contact series can be distinguished. Experimental results illustrate its influence on the reduction of transmitted voltage value due to the effect of dust particles in ambient air. An attempt to explain the results by mathematical means is made. A simple theoretical model, derived from elementary statistics, is applied to gain an insight into physical meaning of the results
Keywords :
contact resistance; electrical contacts; relays; contact resistance; contamination; dust particles; probability; serially connected relay contacts; switching contact; theoretical model; transmitted voltage value; voltage signals; Chromium; Circuit testing; Contact resistance; Contamination; Electrical resistance measurement; Protective relaying; Relays; Resistors; Statistical distributions; Voltage;
Conference_Titel :
Electrical Contacts, 1990. Proceedings of the Thirty-Sixth IEEE Holm Conference on ... and the Fifteenth International Conference on Electrical Contacts
Conference_Location :
Montreal, Que.
DOI :
10.1109/HOLM.1990.113033
