Title :
Determination of thermal recovery characteristics of an SF6 rotating arc
Author :
Ravishankar, B.R. ; Guruprasad, K.P. ; Naidu, M.S.
Author_Institution :
Central Power Res. Inst., Bangalore, India
Abstract :
The SF6 rotating arc technology has been used in the medium voltage range circuit breakers (12-36 kV). The paper describes the modified Mayr´s model applied to a rotating arc to analyse its behaviour during thermal recovery period. The thermal recovery period is governed by the post arc current, transient recovery voltages and the loss processes. Post arc currents are computed for fault currents upto 25 kA, 3 bar gas pressure and different imposed rate of rise of recovery voltages (RRRV). Limiting RRRVs have been determined for successful interruption
Keywords :
SF6 insulation; circuit-breaking arcs; fault currents; gas blast circuit breakers; transients; 12 to 36 kV; 25 kA; 3 bar; SF6; SF6 rotating arc; fault currents; gas pressure; loss processes; medium voltage circuit breakers; modified Mayr´s model; post arc current; rate of rise of recovery voltages; transient recovery voltages; Circuits; Coils; Conductivity; Electrodes; Interrupters; Magnetic analysis; Magnetic fields; Mathematical model; Medium voltage; Sulfur hexafluoride;
Conference_Titel :
Energy Management and Power Delivery, 1998. Proceedings of EMPD '98. 1998 International Conference on
Print_ISBN :
0-7803-4495-2
DOI :
10.1109/EMPD.1998.702838
