Contact Resistance and Overtemperature Behavior as a Function of Ambient Temperature and Contact Force-an Investigation on New and Pre-Arced Power Engineering Contacts
Switching devices for power engineering are continuously decreasing in size.Therefore, focus on overtemperature behavior and electrical resistance within their various contact components becomes exceedingly important, especially for contact tips.Their behavior is important for new devices as well as for devices during service life.Thus, new contacts and pre-arced contacts are investigated in this paper by varying parameters such as contact force and ambient temperature using a programmable model switch.The dimensions of the model switch as well as the freely adjustable testing conditions are set according to a 160A rated molded ease circuit breaker (MCCB).Silver/graphite (Ag/C5), silver/tungsten (Ag/W50), and silver/metal oxide (Ag/SnO2 12WPD) and their combinations were investigated.Ag/C5 and Ag/SnO2 12WPD show an almost stable contact resistance with increasing temperature while Ag/W50 ends up with increased values.Results obtained are discussed on the basis of electrical conductivity, hardness as a function of temperature, the influence of arcing as well as the roughness of the contact surfaces.
Power Engineering contacts MCCB pre-arced contact resistance overtemperature behavior model switch ambient temperature contact force
Jonas Schreiber Volker Behrens Guojian An Fanyu Meng Michael Finkbeiner
Doduco GmbH, Pforzheim, Germany DODUCO Electrical Contacts Manufacturing Co., Ltd., Tianjin, China
国际会议
温州
英文
65-69
2014-11-16（万方平台首次上网日期，不代表论文的发表时间）