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老师说的很对，不过A1里面对这块作了适度修正，写得更合理了，主要还是要根据两端的工作电压来判定。7 ]: l# Q: `$ }* b' w A
When fitting Y capacitors across barriers, the dielectric strength requirement must be
7 g) e% v+ d7 q) e2 d+ z5 vconsidered. For example, for voltages in the range of 212 V peak to 354 V peak, two MEANS+ @: C1 f7 V& K0 k
OF PATIENT PROTECTION are required to be tested at 4 000 V a.c. This would then require the
4 S" X; ]+ D8 ^% Y$ {use of Y1 capacitors. Two Y2 capacitors in series would not withstand this voltage as they are: Q4 L9 a7 w9 s1 O+ v3 {6 w
rated at 1 500 V a.c. each. For voltages below 212 V peak, two Y2 capacitors would suffice as
1 } T- v9 o2 R+ jthe dielectric strength requirement is 3 000 V a.c.0 L7 c* K* l+ X" k5 i! R0 L$ j
: U7 y& a& ~) m
A Y capacitor (Y1 or Y2 only) complying with IEC 60384-14 is considered equivalent to one1 a1 Z% d: U' _; |8 j
MEANS OF PATIENT PROTECTION. Where two capacitors are used in series, they shall be2 ?' n$ J* K6 v2 t" H& w+ n
identical in type (either both Y1 or both Y2) and shall have the same NOMINAL capacitance.
4 @8 Z0 Z3 T' ^2 q9 CThe capacitor(s) shall meet the dielectric strength for the type of protection for which they are8 s4 K" F% k4 Q5 T m
being used (i.e. one or two MEANS OF PATIENT PROTECTION).# X2 h& s# n5 } c+ _
) |# ]1 d( X( V/ E) p( h$ YWhere the working voltage across a barrier forming a MEANS OF PATIENT PROTECTION is less
4 m9 s2 K" k# X+ G& x$ hthan 42,4 V peak a.c. or 60 V d.c., a single Y1 capacitor is acceptable for two MEANS OF& w. R$ b4 [' b0 W7 Q) d
PATIENT PROTECTION. |
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发表于 2012-4-21 08:13
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