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之前发了个关于泄放电阻的帖子,不过那个帖子只是考虑泄放电阻有认证的情况.
! Z b" w) }5 Q. Q但是因为有认证的泄放电阻价格比没有认证的高很多,所以很多时候都是使用的无认证的电阻.
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另外请不要说什么把泄放电阻放在保险丝后就可以了的话,因为这个谁都知道.$ i/ l" @# [; A. P
! V* _$ @0 H* B$ ]$ L: K用的标准是60950, C( Y7 Y& V& u# O1 d8 V# k: l1 g. M
1.5.7.1 里面 There are no special requirements for resistors bridging FUNCTIONAL INSULATION, BASIC INSULATION or SUPPLEMENTARY INSULATION,
5 h; j1 a0 v; R; a3 \' t7 G, L' v桥接在基本绝缘就没有要求?; K4 n; j& `: _( S0 X: R6 b0 X
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另外 如果是CLASS I PLUGGABLE EQUIPMENT TYPE A 并且考虑国家差异,即考虑1.5.7.1
8 A5 d7 R$ {% M% K- ~- H6 R, sNOTE In Finland, Norway and Sweden resistors bridging BASIC INSULATION in CLASS I PLUGGABLE EQUIPMENT TYPE A must comply with the requirements in 1.5.7.2. C0 }1 g1 ]) _* s% Q
1 v2 {' A4 {' c% u& l在有俩个泄放电阻的情况下,是必须要一个泄放电阻短路时,距离还要符合要求) V% ?+ j9 Z+ U' W0 G) k/ ~0 s
即:1.5.7.2的 If a group of resistors is used, the CLEARANCE and CREEPAGE DISTANCE are assessed as if each resistor were short-circuited in turn8 S& z1 W; z- M8 M
还是只要短路情况下能通过耐压测试,并且满足LCC就可以了.If an accessible conductive part or circuit is separated...................................
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因为根据标准的描述,一组电阻时,短路时要满足距离要求.
2 g% E( h* g* `但是我又想到,既然桥接加强绝缘都可以只要满足耐压和LCC,那么桥接基本绝缘是否也只要满足耐压和LCC就可以了呢? |
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