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By John G. Webster (Editor)

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88 × VL−L because there is no neutral shift. 25 ϫ VLϪL, as each phase is interrupted. 76 for IEC standard circuits. After the first phase clears, the currents in the other two phases are in series, and therefore are equal and are interrupted 90 electrical degrees later. Subsequently, the peak of the TRV takes about half of the first phase to clear. Figure 5(b) shows a simplified, grounded, three-phase circuit with a three-phase fault. This circuit is similar to three single-phase circuits connected together.

Medium-voltage (5 kV to 38 kV) metal-clad breakers are classified as indoor breakers, and high-voltage (15 kV to 72 kV) breakers and reclosers as outdoor breakers. , close-open sequence). In addition, a recloser is a circuit breaker that is used in a substation or on a pole. It has voltage ratings of 15 kV to 38 kV and a different duty cycle from a breaker. 09. 54, and UL specifications. High-voltage outdoor breakers produced for the European market must at least meet the IEC 56, and medium-voltage metal-clad switchgear must meet the IEC 298 standards.

The self-induced magnetic fields B produced by the current from the conductors to the electrodes (1) causes transfer of the high current arc to the arcing electrodes or arc runners and (2) blows the arc into the arc chamber. In some breakers this is aided by a puff of air onto the arc. During interruption of load and overload currents (less than twice the load current), the breaker is tripped, and the movable electrode is accelerated from the stationary electrode, forming an electric arc of increasing length between them.

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


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