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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。
6 _. @& ]& t; vWhen fitting Y capacitors across barriers, the dielectric strength requirement must be
4 \" g. b: x4 ~: k2 _+ b* E5 ?considered. For example, for voltages in the range of 212 V peak to 354 V peak, two MEANS
9 D1 s2 A4 d5 U$ D0 zOF PATIENT PROTECTION are required to be tested at 4 000 V a.c. This would then require the
- F2 x* W; D+ a R! \use of Y1 capacitors. Two Y2 capacitors in series would not withstand this voltage as they are. ? b" Q( ]1 k9 _( J8 V: N0 \: ?
rated at 1 500 V a.c. each. For voltages below 212 V peak, two Y2 capacitors would suffice as
( B$ M" E; W+ w7 B! Sthe dielectric strength requirement is 3 000 V a.c.. J3 m. F& d, Z2 m2 _
3 Q8 J( j! B$ S5 q2 IA Y capacitor (Y1 or Y2 only) complying with IEC 60384-14 is considered equivalent to one- d/ n/ D6 S* G' ?; ]* W) o! h
MEANS OF PATIENT PROTECTION. Where two capacitors are used in series, they shall be
; ^6 B/ d) a# Xidentical in type (either both Y1 or both Y2) and shall have the same NOMINAL capacitance. L& Z$ F" e7 k, \3 X3 K
The capacitor(s) shall meet the dielectric strength for the type of protection for which they are' A' n" c' M4 y! N- Q. j
being used (i.e. one or two MEANS OF PATIENT PROTECTION).
4 J( W8 g0 W7 M% N6 c6 P$ ?
2 W! Y+ Y& j( QWhere the working voltage across a barrier forming a MEANS OF PATIENT PROTECTION is less8 h( ?; D/ A; n
than 42,4 V peak a.c. or 60 V d.c., a single Y1 capacitor is acceptable for two MEANS OF7 X! U5 b- ? h) h8 u. t( J
PATIENT PROTECTION. |
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发表于 2012-4-21 08:13
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