. The Bell System technical journal . 50-6 TIME,t, IN 10~^ SECONDS Fig. 3—-Typical contact voltage transient on break of an inductive contacts in atmospheric air, E = 50 volts, L = henry, R = 950 ohms andC = 510 X 10^- farad. Velocity of contact separation = 40 cms/sec. 540 THE BELL SYSTEM TECHNICAL JOURNAL, MAY 1954 o o> o< h-zoo 300. TIME,t, IN 10^ SECONDS Fig. 4 — Contact voltage transient with sustained arc on break of an inductivecircuit. Pd contacts in atmospheric air, E = 50 volts, L = henry, R = 115ohms, C = 20 X 10~^ farad. Velocity of contact separation 40
. The Bell System technical journal . 50-6 TIME,t, IN 10~^ SECONDS Fig. 3—-Typical contact voltage transient on break of an inductive contacts in atmospheric air, E = 50 volts, L = henry, R = 950 ohms andC = 510 X 10^- farad. Velocity of contact separation = 40 cms/sec. 540 THE BELL SYSTEM TECHNICAL JOURNAL, MAY 1954 o o> o< h-zoo 300. TIME,t, IN 10^ SECONDS Fig. 4 — Contact voltage transient with sustained arc on break of an inductivecircuit. Pd contacts in atmospheric air, E = 50 volts, L = henry, R = 115ohms, C = 20 X 10~^ farad. Velocity of contact separation 40 cms/sec. tical purposes one may neglect the voltage drop time which is the initia-tive period of the arc. For the circuit in Fig. lb, the current through thearc is the summation of the main circuit current and the transient current from the l-c circuit. The transient current is (Vai — y)(T)^%in ^{Icf^. Fig. 7, (a) and (b), represent diagrammatically the voltage and currenttransients for lumped and distributed circuits. In both cases the arc is 300
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