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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。$ M0 s: o! w: o
When fitting Y capacitors across barriers, the dielectric strength requirement must be0 z1 j3 O! K; N3 [- j* B
considered. For example, for voltages in the range of 212 V peak to 354 V peak, two MEANS
4 L4 D/ n& w, ?4 x! k( ^% B& fOF PATIENT PROTECTION are required to be tested at 4 000 V a.c. This would then require the) n) u) b% A s/ O% k, M
use of Y1 capacitors. Two Y2 capacitors in series would not withstand this voltage as they are
: c2 x, }) H& {) S$ j. |9 Trated at 1 500 V a.c. each. For voltages below 212 V peak, two Y2 capacitors would suffice as
7 P, }* [3 R, N6 ythe dielectric strength requirement is 3 000 V a.c.) H a$ t0 X0 O9 v$ z i
, P+ A4 F* _: E `- k" _( x4 N; W
A Y capacitor (Y1 or Y2 only) complying with IEC 60384-14 is considered equivalent to one
9 K/ r6 _) z' W4 g3 N" @# pMEANS OF PATIENT PROTECTION. Where two capacitors are used in series, they shall be& h0 w( ?+ |3 n( `# r
identical in type (either both Y1 or both Y2) and shall have the same NOMINAL capacitance.6 W8 T% R9 M+ I5 z. F
The capacitor(s) shall meet the dielectric strength for the type of protection for which they are
3 {5 U& B! P+ ~ q* R' Ebeing used (i.e. one or two MEANS OF PATIENT PROTECTION)." v: M2 S- c- {+ l" c$ B6 j
3 X: `! ~$ s/ K" ?
Where the working voltage across a barrier forming a MEANS OF PATIENT PROTECTION is less
% R+ Q8 t F) W7 l; w2 Athan 42,4 V peak a.c. or 60 V d.c., a single Y1 capacitor is acceptable for two MEANS OF
$ J+ f# c( J v# ]. VPATIENT PROTECTION. |
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发表于 2012-4-21 08:13
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