程控交换机过压过流防护分析

Safeguard analysis against overvoltage and overcurrent of SPC exchanges

如何提高程控交换机的过压过流防护能力，一直是通信系统中非常重要的研究课题。本文在分析产生过压过流原因的基础上，着重讨论了配线架和用户接口电路过压过流保护的方法和防护器件，对现行的防护技术指标进行了分析和探讨，提出了较为合适的防护措施和指标参数，实验结果表明，性能可靠，满足邮电部有关技术标准的要求。

It has been being a vital important topic of how to improve the safeguard abil-ity of overvoltage and overcurrent in SPC exchanges. On analyzing the causes of overvoltage and overcurrent emerging,this paper attaches importance to discuss the protection method and safeguard components on MDF (main dis-tribution frame)and SLC (subsriver line circuit);based upon the exploitation of the technical specifications in current use,it proposes a some fit approach and technical parameters. Through practice it shows to be reliable and meets the related specifications of the Ministry of Post and Telecommunication.