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

By John G. Webster (Editor)

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2. Private conversation with Mr. R. , Pittsburgh, PA. 3. Ref. 1, pp. 8–9. 4. T. E. 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.

This voltage has a transient component determined by the circuit parameters and a steady-state sinusoidal component. u. 5 where VL–L is line to line rms voltage. (1) 372 CIRCUIT BREAKERS Breaker EA A A GND EB B C1 A A C2 GND B C1 A GND B B C2 GND B Three-phase load GND GND EC C GND C GND C1 GND C C C2 GND GND C GND GND (a) Breaker EA A A B A A C2 GND GND EB C1 B C1 A GND B B C2 GND B Three-phase load GND GND EC C GND C GND C1 GND C C C2 GND GND C GND GND (b) Figure 5. Schematic of a simplified three-phase circuit showing the source, breaker, and load.

This simple model explains reasonably well the behavior of conductors that is observed experimentally on a macroscopic scale. The free-electron gas model of a perfect conductor has interesting consequences. First, it implies that a perfect conductor cannot sustain an internal electric field if charges are at rest. Consider a static electric field applied via a voltage source to an isolated conducting block having a net charge of zero, as shown in Fig. 1. The externally applied electric field causes the free electrons in the conductor to move about until they reach a region where the total perceived electric field V + – – – – – – + + + + + Figure 1.

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