## Reignition of metallic A-C. arcs in air |

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ampere Appendix arc between copper Arc Between Flat arc current zero arc extinction arc fails arc length arc path Arc Shunt ARCS IN AIR breakdown voltage capacity shunted arc cathode drop circuit breaker duty circuit constants considerable critical resistance current and voltage cyclogram direct current distributed capacity elec envelope curves extinc extinguish flat copper electrodes glow discharge glow voltage greater indicate inductance and capacity Initial Conditions large capacity negative glow negative value obtained ohms oscillograms parallel power system produce a negative rate of voltage re-striking voltage reignition locus Resistance Shunted Arc resistance the electrode result rise toward reignition shown in Fig sinh Slepian slope spark successive half-cycles supply voltage tion trodes separate Unshunted Arc value of arc value of arc-failure volt-ampere voltage drops voltage following voltage is reached voltage recovery curve voltage required voltage rise curve Voltage—Time Values volts zero voltage