电气 什么是selv和pelv？felv是什么意思保护特低电压pelv (protective extra low voltage, 缩写 pelv) ，只作为保护接地系统的安全特低电压用防护。安全特低电压 selv (safety extra low. 电介质；绝缘体 [网络] 介电质；介质 [专业] 介电 [电子、通信与自动控制技术]；介电 [化学]；介质 [物理学] insulation n.
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