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(上接2006年第4期57页)9组合保护单元当8.2节中的方法都无法采用,或需要额外的保护时,可以使用组合保护单元CPU。组合保护单元包含所有端口的浪涌保护元件,以获得短连接导线的要求。它们安装在设备附近,因而还可以对内部线路上出现的过电压进行保护。组合保护单元应与初级保护
(Continued from Page 4 of 2006, p. 57) 9 Combination Protection Units The combination protection unit CPU can be used when none of the methods in Section 8.2 can be used or additional protection is required. The combined protection unit contains surge protection components for all ports to obtain the short connection wires. They are installed near the equipment and can therefore also protect the overvoltages that appear on the internal lines. Combination protection unit should be protected with primary protection