Title :
On the arcless commutation of currents higher than 1 kA
Author :
Niayesh, Kaveh ; Tepper, Jens ; König, Friedrich
Author_Institution :
Corp. Res., Asea Brown Boveri Switzerland Ltd., Baden, Switzerland
Abstract :
A new current limiting principle based on the application of liquid metals is proposed. This principle takes advantage of the arcless commutation of currents to a gradually increasing parallel resistance and makes it possible to realize a current-controlled resistor for very high currents, which can be used to limit the fault currents in power networks. The conditions for the arcless current commutation are investigated theoretically and the optimum profile for the parallel resistor is derived. An experimental set-up is constructed to investigate the behaviour of the separating contacts under different current amplitudes, different current steepnesses and different resistance profiles. The experimental results relating to the commutation phase are compared to the theoretical limits.
Keywords :
commutation; electric resistance; electrical contacts; fault current limiters; liquid metals; resistors; arcless current commutation; current controlled resistor; current limiting principle; electrical contacts; fault currents; liquid metals; parallel resistance; power networks; Contact resistance; Current density; Current limiters; Fault currents; Fuses; Impedance; Low voltage; Magnetic materials; Resistors; Superconducting materials;
Conference_Titel :
Electrical Contacts, 2004. Proceedings of the 50th IEEE Holm Conference on Electrical Contacts and the 22nd International Conference on Electrical Contacts
Print_ISBN :
0-7803-8460-1
DOI :
10.1109/HOLM.2004.1353146
