Download 46.Power Delivery by John G. Webster (Editor) PDF

By John G. Webster (Editor)

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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. This mechanism is located in the rear of the structure and cannot be seen. The time from receiving the trip signal to current interruption is three cycles, which is shorter than that for magnetic air breakers.

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. All circuit breakers have source-side connections, load-side connections, and conductors internal to the interrupters. Figure 11 is a simplified circuit breaker model.

These characteristics must also match the required continuous load current, overload current, and fault current of the circuit. Momentary Currents A circuit breaker must withstand close and latch currents when the breaker is closed-in on a high fault current. The high momentary current may be beyond the capability of the breaker to interrupt. 6 times rated short-circuit current and last for 10 cycles. When this occurs, a downstream breaker having a higher cur- 370 CIRCUIT BREAKERS rent interruption capability interrupts the current.

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