The paper analyzes the major reasons of overvoltage and overcurrent occuring to program-controlled digital users exchanger, and discusses the protection methods against overvoltage and overcurrent.
本文分析了程控数字用户交换机过压过流产生的主要原因，并讨论了过压过流的保护方法。
The paper analyzes the major reasons of overvoltage and overcurrent occuring to program-controlled digital users exchanger, and discusses the protection methods against overvoltage and overcurrent.
本文分析了程控数字用户交换机过压过流产生的主要原因，并讨论了过压过流的保护方法。
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