Title :
Erosion of silver-base material contacts by breaking arcs
Author :
Kejian, Wang ; Qiping, Wang
Author_Institution :
Xi´´an Jiaotong Univ., China
Abstract :
The mechanism of material erosion of Ag-base material contacts caused by breaking arcs of up to several hundreds amperes are studied. The factors influencing the contact erosion are analyzed and it is suggested that the electrode erosion is the result of the heat-force effects among arc, electrodes and environment. The main cause of obvious material transfer is the asymmetry of the heat-force effects at two electrodes. It is indicated that there are two forms of liquid ejection; edge ejection and center ejection. The erosion modules are divided into several modes, and each is detailed. A mode diagram is proposed, and the erosion features of Ag-base materials are described
Keywords :
circuit-breaking arcs; electrical contacts; silver; silver alloys; wear; Ag electrode; AgZnO contact; breaking arcs; center ejection; edge ejection; electrode erosion; erosion; heat-force effects; liquid ejection; material transfer; Anodes; Cathodes; Circuits; Electrodes; Frequency; Heat transfer; Inorganic materials; Materials testing; Reactive power; 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.1990.112993
