Erosion of Electrical Contacts by Arcing at Closure in Telephone Switching Systems

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概要

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• The erosion of contact metal, which determines the life of contacts in the telephone switching system, is proportional to the arc energy. The equations for arc voltage, arc current, arc duration time and number of arcs are expressed explicitly in terms of circuit parameters and contact properties, and the expression is derived for arc energy that accompanies a single operation of contact closure. Contact erosion is consistent with the calculated arc energy. The erosion rate at closure is estimated based on the measured contact-erosion volume and the calculated arc energy. Arc energy at contact closure becomes as large as that at contact break if the cable is long or the supply voltage is high. This expression in combination with the expression for contact break enabled us to perform contact life design, which is indispensable for maintenance administration of telephone switching systems.

• 社団法人電子情報通信学会の論文
• 1993-02-25

著者

• Kanai Tsuneo

  Ntt Interdisciplinary Research Laboratories

• Imori Yasutaka

  Ntt Sikoku Network Center

• Ohno Kunio

  NTT Affiliated Business Development Headquarters

関連論文

• Erosion of Electrical Contacts by Arcing at Closure in Telephone Switching Systems

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