标题: 2.9.4e. [打印本页] 作者: 小小书童 时间: 2018-12-28 22:27 标题: 2.9.4e. 标准关于与危险电压的隔离举了三种方法，其中方法1) 2)很好理解，但是方法3)什么意思，以前都没注意这个东西。 + i$ W3 _, X6 x& g" T7 s7 C9 s! B原文是:e) Method 3) BASIC INSULATION on the part at a HAZARDOUS VOLTAGE, together with connection of the other part to the main protective earthing terminal in accordance with 2.6.1 b), such that the voltage limits for the accessible part are maintained by relative circuit impedances or by the operation of a protective device; or 4 F) n* e9 w- a# {1 h5 k! z* [4 c6 ~4 ?: w1 f3 D+ Y/ G
然后后面还解释了: For e), it is permitted to protect a circuit by earthing a part other than the protected circuit itself, for example, the secondary winding of a transformer supplying the protected circuit. 7 J0 U3 g: v( ]7 ?; S0 X7 O2 D不解释还好，一解释蒙圈。给被保护电路的供电的次级绕组接地，然后危险电压和被保护电路之间只需要BI就行了。what?... 4 T0 K3 E5 v- u0 A) {$ x