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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。
0 a$ N8 l) T. P8 E# jWhen fitting Y capacitors across barriers, the dielectric strength requirement must be
) M6 J% Z4 R- J4 yconsidered. For example, for voltages in the range of 212 V peak to 354 V peak, two MEANS# `1 e" c+ S2 x4 t5 {4 _' J9 S+ l+ x
OF PATIENT PROTECTION are required to be tested at 4 000 V a.c. This would then require the
$ M/ j. n: n0 |+ n. M/ Q( uuse of Y1 capacitors. Two Y2 capacitors in series would not withstand this voltage as they are
# k) w0 k8 {# ^rated at 1 500 V a.c. each. For voltages below 212 V peak, two Y2 capacitors would suffice as
7 \0 Q9 x7 a5 c9 n% l* zthe dielectric strength requirement is 3 000 V a.c.8 T( A1 T# f3 ?% }4 Q( S
# G5 s" u% N9 ^; V/ q7 LA Y capacitor (Y1 or Y2 only) complying with IEC 60384-14 is considered equivalent to one! d9 I) X F* c
MEANS OF PATIENT PROTECTION. Where two capacitors are used in series, they shall be
% H( L1 }) k, G4 N& ]$ U+ I( [% I; eidentical in type (either both Y1 or both Y2) and shall have the same NOMINAL capacitance.. R& Q8 Y8 u3 p
The capacitor(s) shall meet the dielectric strength for the type of protection for which they are
" R2 u' t1 P z3 j) I0 bbeing used (i.e. one or two MEANS OF PATIENT PROTECTION).
" S6 u* o4 R5 c* b1 X3 n; I$ q' v& {( z4 B: K% C! K5 g
Where the working voltage across a barrier forming a MEANS OF PATIENT PROTECTION is less7 b" y* ?2 w! }6 T- { A5 Z
than 42,4 V peak a.c. or 60 V d.c., a single Y1 capacitor is acceptable for two MEANS OF5 ^# q& N1 a7 a: ^
PATIENT PROTECTION. |
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发表于 2012-4-21 08:13
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