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发表于 2013-10-23 19:28:21
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无意中看到一段关于IT系统的文字:
Today, the IT system closely resembles the TN-S as regards installation (an additional surge limiter and insulation monitor).
如今,IT系统和TN-S系统在装置(一个额外的浪涌限制器和绝缘监测器)上很类似。
It is the champion of continuity of service and safety on the first fault, if this fault is promptly tracked and eliminated.
它是持续供电和第一次故障时系统也安全的胜利,如果这个故障能马上被追踪和消除。
Following widespread use of the distributed PE throughout the installation (as in TN), this system, in which the second fault current cannot be limited, will not really evolve, except for the rapid fault tracking techniques. As the likelihood of a double fault increases with the number of feeders
and size of the installation, its use should be reserved for parts of the network and for control and monitoring circuits with, naturally, use of isolating transformers (see fig. 21).
随着分布式PE线在装置(像在TN系统)中的广泛使用,第二次故障电流在此系统中不能被限制,因此这个系统也就不能确实得到发展,除非有快速的故障跟踪技术。随着装置系统的电路分支越来越多,结构越来越大,出现第二次故障的可能性就会增加,因此自然地在使用隔离变压器时,该系统(指IT系统)的使用应该被限制在网络系统的部分结构里,来控制和监测回路。 |
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