COMPUTATIONAL FLUID DYNAMICS IN A 126kVAUTO-PUFFER SF6 CIRCUIT BREAKER TAKING ARC EFFECTS INTO ACCOUNT

The requirements for increasing the switching capacity of SF6 circuit breakers, dictated by power grid companies due to increase in rated short-circuit currents networks 126 kV and above, are difficult satisfy. Firstly, material, resource financial costs doing that colossal, secondly, before creating a prototype new breaker or upgrading existing one, it is necessary calculate complex physical processes arc extinguishing occurring high-voltage interrupter. latter reduced problem modeling interaction between nonisothermal gas flow. paper investigates solution this numerical software package, taking into account form thermal heating source, based on experimental data measuring temperature during symmetrical current 10 kA breaking. calculations were carried out Calculations pressure mass flow under-piston area change, speed, depending contact travel given. developed model with was used simulate process 25 short