The extinction of arcs in air-blast circuit-breakers

The paper deals with the development of air-blast circuit-breakers, and describes investigations of the many factors affecting their performance. Particular attention is paid to the aerodynamic design of the circuit breakers. The development of the air turbulator and its application in commercial 66-kV and 132-kV circuit breakers are described. The data tabulated are derived from an analysis of results of short-circuit tests extending over many years.