A simple test method for the welding degradation of arcing contacts
Konferenz: ICEC 2014 - The 27th International Conference on Electrical Contacts
22.06.2014 - 26.06.2014 in Dresden, Deutschland
Tagungsband: ICEC 2014
Seiten: 5Sprache: EnglischTyp: PDF
Persönliche VDE-Mitglieder erhalten auf diesen Artikel 10% Rabatt
Autoren:
Boehm, Moritz; Morin, Pauline; Schmoelzer, Thomas; Simon, Reinhard A. (ABB Corporate Research, 5405 Baden-Daettwil, Switzerland)
Gentsch, Dietmar (ABB Calor Emag Medium Voltage Products, 40472 Ratingen, Germany)
Inhalt:
In some switching situations arcing contacts are subject to welding degradation, which limits the performance and lifetime of the device. Usually such a behaviour is studied in long-term tests applying numerous switching operations. However, for contact material selection at an early development stage, a fast screening method would greatly benefit the material selection process. In the present work, a simple method based on stud-welding and tensile testing was deployed. Cu-Cr materials with different Cr concentrations were tested and subsequently analysed by light-optical microscopy. The test method as well as the microstructural material degradation are discussed in detail. Based on the results of the welding tests, a ranking of the welding performance of the investigated Cu-Cr materials is given.