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

By John G. Webster (Editor)

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Sample text

A typical electrode stroke is a motion of several inches within tens of milliseconds. Each set of electrodes is surrounded by pots or ‘‘de-ion’’ grids similar to those used with high-voltage oil breakers. The current interruption process is the same as for the oil transmission breaker described previously. A spring-operated mechanism operates the movable electrodes of the breaker or recloser. The mechanism consists of energy storage springs that are wound either by a solenoid, an electric motor or are wound manually.

Referring to Fig. 1, the external electric field is tangential to the vertical walls of the block and must vanish on these walls while the field is normal to the top and bottom surfaces of the block and is allowed to exist on these surfaces. Furthermore, in the regions outside the conducting block, the electric field remains undisturbed by the introduction of the block; that is, the field in those regions is the same whether the block is present or not.

4 kV, 600 A, oil circuit breaker (courtesy of Marcel Dekker). Figure 3. 500 kV compressed-air circuit breaker (courtesy of MIT Press). CIRCUIT BREAKERS 369 are used, the time to voltage crest is typically 60 Ȑs. For breakers connected to overhead line circuits, the time to crest is typically 30 Ȑs. The reason for the difference in the times to crest is that cables have much higher capacitance per length than overhead lines. The basic-impulse voltage (BIL) is a rating required of all power equipment.

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