ABBREVIATION for Sozialdemokratische Partei Deutschlands 德国社会民主党
Finally, the principle and arrangement of SPDs on equipments signal side was briefly introduced.
最后，简要介绍信号电涌保护器的原理和配置。
For SPDs, with a protective level different from that provided at the origin, as in the IEC standards, then coordination is mandatory.
对于SPD，由于保护水平不同于在入口处提供的保护水平，正如iec的标准，那么协调配合就是强制性的。
The main topics covered here are the essential functions, system structure, the principles for selecting safety monitoring parameters, and the method for SPDS display screens design.
着重讨论了系统的基本功能、系统的结构、安全监测参数的分析选择及SPDS的显示画面设计等设计技术问题。
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