The paper presents the results of magnetic induction and electrodynamic force calculations acting on arc column during short-circuit in medium voltage air-insulated bus-bars. The gap between the bars was 120 mm and the prospective short-circuit currents ranged from 4 kA to 8 kA. The paper also shows the measurement results of average velocity fault arc depending on currents arc diameter and arc current was established and described. Based on the calculation results of electrodynamic forces acting on the arc and calculated arc diameter , as well as the measurements of arc velocity, the relation of aerodynamic resistance coefficient to arc current was presented. The conclusions indicate. Inter alia, the possibility of changing arc's traveling direction, as a result of changing the direction of electrodynamic forces. Attention is also drawn to deformation of arc columns and increase in arc voltage, which cause increase in arc's power, resulting in greater impact of three-phase arcing short-circuits in switchboards.
Autorzy
Informacje dodatkowe
- Kategoria
- Publikacja w czasopiśmie
- Typ
- artykuły w czasopismach recenzowanych i innych wydawnictwach ciągłych
- Język
- angielski
- Rok wydania
- 2009
