Russell E. Frink

Size Reduction and Rating Extension of Magnetic Air Circuit Breakers up to 500,000 Kva, 15 Kv

AIR CIRCUIT BREAKERS rapidly are becoming the standard of the industry for voltages up to 15,000 volts and for kilovolt-ampere ratings of 50,000 to 500,000 kva. Their general desirability as compared to oil-type switchgear is now recognized by most users.

SF6 Magnetic-Puffer Circuit Breaker for 34.5 kV, 1500 MVA

A circuit breaker of a new type has been developed as the removable breaker element for metal-clad switchgear for 23/34.5 kV service. It is a single pressure, dead-tank SF6 circuit breaker which employs magnetic driving action produced by the fault current to drive the gas through the arc to interrupt it. Complete development tests have been performed, as required by applicable standards, as well as additional tests, considered justified, to prove reliability. The resulting breaker is small in size, quiet in operation, and provides features heretofore unavailable in circuit interrupters.

A new 5-kv 50,000-kva de-ion air circuit breaker

Continuous development work on magnetic air circuit breakers has produced many outstanding changes, as is demonstrated by this electrically and mechanically improved design. Its better operation and reliability is verified by test data.