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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。
5 V5 `/ Z% n2 o& A# ^When fitting Y capacitors across barriers, the dielectric strength requirement must be# G5 H, U8 j, |' o( K2 n
considered. For example, for voltages in the range of 212 V peak to 354 V peak, two MEANS
0 D% W9 w3 v1 _+ L2 r' GOF PATIENT PROTECTION are required to be tested at 4 000 V a.c. This would then require the
% b) ]+ o4 o- i* m, U# cuse of Y1 capacitors. Two Y2 capacitors in series would not withstand this voltage as they are0 t' {4 O8 h3 C: Z8 t+ {
rated at 1 500 V a.c. each. For voltages below 212 V peak, two Y2 capacitors would suffice as
' c l/ l. @, T) k0 ~ h1 |8 @the dielectric strength requirement is 3 000 V a.c.
4 y$ L( ^1 }: E5 [& m# B
k8 N7 l. }6 ?) ~) }; cA Y capacitor (Y1 or Y2 only) complying with IEC 60384-14 is considered equivalent to one# _0 v+ ~" ]0 d: }7 k
MEANS OF PATIENT PROTECTION. Where two capacitors are used in series, they shall be
( o9 w# c j( ?$ S, qidentical in type (either both Y1 or both Y2) and shall have the same NOMINAL capacitance.# S+ a7 F/ h' p q( g/ z3 R
The capacitor(s) shall meet the dielectric strength for the type of protection for which they are3 [9 C3 {/ N% L
being used (i.e. one or two MEANS OF PATIENT PROTECTION).0 h4 {$ p/ f4 P3 [3 s4 @# t( J
3 e/ p" Q3 W8 C+ z9 H; Y. |Where the working voltage across a barrier forming a MEANS OF PATIENT PROTECTION is less. I1 {. u, G) e( N3 p/ p7 ?: K% [' d; D
than 42,4 V peak a.c. or 60 V d.c., a single Y1 capacitor is acceptable for two MEANS OF# t" V! _7 P& l% V
PATIENT PROTECTION. |
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发表于 2012-4-21 08:13
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