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The variation with current and inductance of metal transfer between contacts of palladium and silver

The variation with current and inductance of metal transfer between contacts of palladium and silver

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The work on transfer between platinum contacts, published by one of the authors in previous papers, has been extended to palladium and silver. Curves of the net transfer in 6-volt d.c. circuits are given for currents of a few amperes and inductances ranging from less than 0.1μH up to 110μH. Some measurements have also been made in 12 and 24-volt circuits for palladium. The general nature of the transfer for palladium is both qualitatively and quantitatively similar to that for platinum, but in the case of silver, neither residual nor reversed short-arc transfer has been demonstrated. Theoretical analysis of the results shows that the quantity determining transfer in an inductive circuit is the ratio of the charge passed in the arc to the volume of residual transfer at the same break current. Under conditions of constancy of this ratio, transfer is found to be proportional to the square of the break current up to 6.5 amp.

Inspec keywords: switching; electrical contacts

Subjects: Electrical contacts

References

    1. 1)
      • J. Warham . The Effect of Inductance on Fine Transfer between Platinum Contacts. Proc. I.E.E., Part I
    2. 2)
      • J. Riddlestone . The Variation with Current and Inductance of Metal Transfer between Platinum Contacts. Proc. I.E.E., Part C
    3. 3)
      • W.B. Ittner . Bridge and Short Arc Erosion of Copper, Silver and Palladium Contacts on Break. Journal of Applied Physics
    4. 4)
      • W.G. Pfann . Bridge Erosion of Electrical Contacts and its Prevention. Transactions of the American I.E.E.
    5. 5)
      • Ittner, W.B.: `Bridging and Arc Formation at Separating Tungsten Contacts', Proceedings of the Electrical Contacts Seminar, July 1954, Pennsylvania.
    6. 6)
      • J.J. Lander , L.H. Germer . Bridge Erosion of Electrical Contacts, Part 1. Journal of Applied Physics
    7. 7)
      • W.S. Boyle , L.H. Germer . Arcing at Electrical Contacts on Closure: Part VI—The Anode Mechanism of Extremely Short Arcs. Journal of Applied Physics
    8. 8)
      • M.M. Atalla . Arcing of Electrical Contacts in Telephone Switching Circuits: Part V—Mechanism of the Short Arc and Erosion of Contacts. Bell System Technical Journal
    9. 9)
      • L.H. Germer , W.S. Boyle . Anode and Cathode Arcs. Nature
    10. 10)
      • L.H. Germer , W.S. Boyle . Two Distinct Types of Short Arcs. Journal of Applied Physics
    11. 11)
      • J. Riddlestone . Short Duration Discharges between Separating Contacts in a 6V Circuit. British Journal of Applied Physics
    12. 12)
      • M.M. Atalla . Arcing of Electrical Contacts in Telephone Switching Circuits: Part II—Characteristics of the Short Arc. Bell System Technical Journal
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