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

By John G. Webster (Editor)

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The overcurrent trips of the breaker have an adjustable Vacuum Breakers Figure 8 shows a typical metal-clad vacuum breaker withdrawn from the switchgear cabinet. The metal-clad vacuum circuit breaker is similar in construction to the air magnetic except that vacuum interrupters are used instead of electrodes in air surrounded by an arc chamber with deionizing plates. The vacuum interrupters are very similar to those described previously, and the theory for current interruption in vacuum is the same.

374 CIRCUIT BREAKERS interrupter consists of ‘‘tulip’’-shaped hollow electrodes consisting of the movable electrode and a stationary cylindrical electrode. The interrupters can be either single-flow or double-flow. Upon current interruption, the movable electrode separates from the stationary electrode producing an electric arc between the electrodes. Compressed gas blasts through the electrodes with a tremendous radial velocity, several times the speed of sound. This radial gas flow cools the axially burning arc.

In-rush currents of induction motors when first energized from a stop position, known as locked-rotor currents. 1 s. 3. Induction motors operated continuously at 115% of normal rated current. The electronic trip or relaying determines the time-current trip characteristics of circuit breakers. 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.

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