A New HV and EHV Air Blast Circuit Breaker Design: I - Ratings, Construction, and Testing

In the electric power industry, much effort has been expended in the development of oilless circuit breakers, particularly for use in extra high voltage (EHV) systems. This paper describes a new line of HV and EHV air blast circuit breakers having a 2-cycle interrupting time rating, and an operating pressure of 370 psi. The breakers utilize separate power interrupting and circuit isolation modules to permit maximum flexibility in building breakers with a variety of interrupting ratings at various voltage levels, from the HV classes up to 550 and 765 kV and above.