安规试题

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IEC60335试验指甲

4．    IEC 60335-1中什么是电子开关？
# }4 x! u' i) ~+ u) L& {0 c" r: aNote:   
0 m$ @; _! Q: Q& u, Y) t4 x4.1 60335-1中提到电子开关涉及的测试最主要就是19.11.4, 当然这个要和off position (3.8.2)一起考虑才有意义。
3 ?8 Z5 Q. c' ]9 n/ Q* x4.2 单纯地看待电子开关的话，请参看61058-1 table 15会很清楚：SSD without electrical contacts, SSD with serial contacts, SSD with parrel contacts, SSD with serial and parrllel contacts, 电子开关可以是半导体元件通断电实现off position, 或者是控制机械触点实现（例如继电器）
6 ], n7 g( F5 n) H4 h! O; q4.3 24.1.3和Annex H也得看看。
  K" v- k1 d, v- a
# ?) Y3 d/ c2 c. F; h8 a7 X5．    关于IEC60335-1 cl 16关于泄漏电流加倍的讨论。
Note: 这个问题在IEC TC 61 Chairman D.R.Johns写的IEC 60335 interpretation 里面有比较清晰的解释.
If the appliance is functionally switched off by a single-pole disconnection, then one end is left
* t3 w4 r; l- Z0 Z, F: W, Pconnected to the supply since the appliance is only functionally off. The leakage current
distribution in the functionally off position can be as shown in figure A (格式问题，图贴不上来） and the nett leakage current will be Ix, where Ix  is the leakage current per unit length of the insulation.
When the appliance is tested according to the method detailed in 16.2, the leakage current distribution will be as shown in figure A (格式问题，图贴不上来）and the nett leakage current will be   Ix.

7 t' C; z: O# {6 y" T1 j. P3 \When the appliance is on the leakage current distribution will be as shown in figure B (格式问题，图贴不上来）and the nett leakage current will be Ix/2 (since the appliance neutral is normally at or near earth potential).

If the appliance is switched off by an all pole disconnection switch or by withdrawal of a plug
: A% ~/ O+ T; Y1 z3 G$ j% Cthen one end is not left connected to the supply when the appliance is off and the leakage
. q7 X6 G# \: acurrent in the off position will be zero. The leakage current value measured during the test of
16.2 will be twice the mean value experienced by the insulation in practice.

It is therefore, permissible to double the limit and still achieve the same level of safety as in the case where the appliance is switched off by a single pole disconnection switch.

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