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Additional info for 46.Power Delivery
Magnetic air and vacuum metal-clad circuit breakers are available in the United States. Other countries have these types as well as SF6 breakers. Air magnetic or vacuum breakers consist of a frame that is drawn from the switchgear unit by a set of rails. LV Power Air Breaker The construction of the magnetic air breaker for indoor metalclad switchgear is similar to that of the metal-clad vacuum breakers except for the current-interrupting elements. The construction of the breaker is shown in Fig.
Browne, Circuit Interrution, Theory and Techniques, New York: Marcel Dekker, 1984, p. 587. 5. T. E. Browne, Circuit Interruption, Theory and Techniques, New York: Marcel Dekker, 1984, p. 549. 6. J. F. Perkins and D. Bhasavanich, Vacuum switchgear application study with reference to switching surge protection, IEEE Trans. IA-19: 879–888, 1983. 7. K. Chen, Industrial Power Distribution and Illuminating Systems, New York: Marcel Dekker, 1990, 143. EQUIVALENT CIRCUIT Reading List A high-frequency model can be developed for nearly all circuit breakers.
Note that the vacuum interrupters are mounted vertically and separated by glass polyester barriers between phases. Each phase has primary disconnect contacts connected to the vacuum interrupters by vertical bus bars. These primary disconnect contacts connect the breaker to the bus work of the metal-clad cabinet when the breaker is inserted into it. A spring-operated mechanism similar to that described for the HV outdoor vacuum breakers and reclosers actuates the vacuum interrupters via linkages.