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对于二类设备来说,我们通常遇到的都是以加强绝缘作为防护,很少遇到用基本+附加方式作为防护,那么只测试IEC60990 figure4就可以了,限值在ES1(0.707mApeak)6 |0 B W& A/ t9 Q
=>同意。5.7.4并为说加强绝缘FAULT. 要强调下5.7.4 为figure 4 or 5的A端连接在未接地的可触及区域或回路。
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9 @" B8 v. J5 }5 y' T0 [& z对于一类设备来说,都是以基本+附加方式作为防护,在正常工作条件下、异常工作条件下和单一故障条件下和安全防护故障,都需要评估,那么IEC60990 figure4 and figure5 都要测试7 ]
7 v% d& U- N4 u" c2 n& | ->Figure A 端连接PE, Figure 4 限值ES1。 (这个我也有点疑惑,不过看5.7.5,限值就是ES1,不超过0.5mA), Z p S2 m# {) @- O2 T5 c
--<Single fault 基本绝缘 Figure 5 限值ES2,
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9 n- u3 Y# c/ R& g% |4 F( o( R5.7.5 Earthed accessible conductive parts9 Z T+ V& C" N8 p, m' h3 Y6 l# b
At least one earthed accessible conductive part shall be tested for touch current following supply connection faults in accordance with 6.1 and 6.2.2 of IEC 60990:2016, except 6.2.2.8. Except as permitted in 5.7.6, the touch current shall not exceed the ES2 limits in 5.2.2.2. |
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