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The processes involved with dynamic welding of contacts are discussed and two different welding mechanisms are identified from work using a very sensitive model switch. One mechanism forms weak welds by cold bonding freshly arced surfaces and the other mechanism involves bonds formed by short arc melting of the contact surface. Using the model switch, silver tin indium oxide contacts having different...
The focus of the studies is on the influence of contact material production parameters, and the contact material breaker interaction of material combinations used for low voltage protection devices. The influence of the magnetic blast field and the material composition on erosion behavior and contact resistance of AgW materials will be scrutinized by model-switch tests. Especially the mass loss during...
Higher power density and longer electrical lifetime at the same time are the main technical targets in development of contactors. Therefore, a close matching of contact material and switching device as well as the understanding of the material-device-interactions is necessary to achieve those demands. The paper will demonstrate the general influence of different material parameters based on Ag/SnO...
The paper outlines the manufacturing technology of different silver-metal and silver-metal oxide composite materials to be used in contacts of low-voltage switches. There were conducted tests of the electrical properties of contacts made of eight different composite materials and hard silver. There was determined their resistance to arc erosion and static welding. There were also measured changes...
Since their invention in the late 1930 by the Bell Labs, the unique features that characterize the reed switches made them the component of choice for such diverse applications as telecommunications, automotive, appliances, test, military and aerospace. This paper deals with the application of glass encapsulated magnetic reed switches as the telemetry indicator in space mechanisms, specifically after...
Material transfer in a low-power direct-current switchgear is commonly known to cause contact failures to open due to mechanical interlocking, which is determined by (i) the shape of the material transfer pip-and-crater formation and (ii) the relative movement of the contact pieces during contact separation. The aim of this work is to analyze the influence of multiple arcing parameters on the evolving...
Low current (<;10A) dc measurements of the transformer windings show a uniform decrease in the resistance as the tapchanger selector switch is advanced from the first tap to the last tap. When the resistance data for a newly manufactured transformer is plotted vs. the odd and even tap positions on its primary windings, the data lies with some small, but acceptable variation, on the same straight...
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