2010年安全工程师考试辅导:其他电击预防技术
其他电击预防技术
1)双重绝缘和加强绝缘
双重绝缘指工作绝缘(基本绝缘)和保护绝缘(附加绝缘)。前者是带电体与不可触及的导体之间的绝缘,是保证设备正常工作和防止电击的基本绝缘;后者是不可触及的导体与可触及的导体之间的绝缘,是当工作绝缘损坏后用于防止电击的绝缘。加强绝缘是具有与上述双重绝缘相同水平的单一绝缘。
具有双重绝缘的电气设备属于Ⅱ类设备。Ⅱ类设备的电源连接线应按加强绝缘设计。Ⅱ类设备在其明显部位应有“回”形标志。
Ⅱ类设备的工作绝缘的绝缘电阻不得低于
2.安全电压
安全电压是在一定条件下、一定时间内不危及生命安全的电压。具有安全电压的设备属于Ⅲ类设备。
安全电压限值是在任何情况下,任意两导体之间都不得超过的电压值。我国标准规定工频安全电压有效值的限值为50v。我国规定工频有效值的额定值有42V、36V、24V、12V和6V。
(1)特别危险环境使用的携带式电动工具应采用42 V安全电压;
(2)有电击危险环境使用的手持照明灯和局部照明灯应采用36V或24V安全电压;
(3)金属容器内、隧道内、水井内以及周围有大面积接地导体等工作地点狭窄,行动不便的环境应采用12 V安全电压;
(4)水上作业等特殊场所应采用6V安全电压。
通常采用安全隔离变压器作为安全电压的电源。安全隔离变压器的一次与二次之间有良好的绝缘;其间还可用接地的屏蔽进行隔离。安全电压二次边应与一次边保持双重绝缘的水平。
安全电压回路的带电部分必须与较高电压的回路保持电气隔离,并不得与大地、保护接零(地)线或其他电气回路连接。安全电压的插销座不得与其他电压的插销座有插错的可能。安全隔离变压器的一次边和二次边均应装设短路保护元件。
如果电压值与安全电压值相符,而由于功能上的原因,电源或回路配置不完全符合安全电压的要求,则称之为功能特低电压。应用功能特低电压须配合补充安全措施。
- 上一篇:2010年安全工程师考试辅导:电气装置安全
- 下一篇:电气隔离
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