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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。% J" R' E8 }4 n: ]7 r5 T
When fitting Y capacitors across barriers, the dielectric strength requirement must be0 x' T) S/ H* F! g& o8 H* k, L% I
considered. For example, for voltages in the range of 212 V peak to 354 V peak, two MEANS
) H" Y1 |2 ^2 L. M- v# `+ T zOF PATIENT PROTECTION are required to be tested at 4 000 V a.c. This would then require the
2 h `: D1 `8 ]4 u7 {# Luse of Y1 capacitors. Two Y2 capacitors in series would not withstand this voltage as they are7 B; T/ n4 J5 ~5 |5 ?
rated at 1 500 V a.c. each. For voltages below 212 V peak, two Y2 capacitors would suffice as+ w2 m. _& e( t9 K4 J9 y7 {- b& g7 K
the dielectric strength requirement is 3 000 V a.c.+ D: f& e# g# p3 L- C/ J4 q3 P
4 { O( w6 o! [3 K/ H: w2 _( eA Y capacitor (Y1 or Y2 only) complying with IEC 60384-14 is considered equivalent to one
2 h6 O; s0 N# Z7 t6 DMEANS OF PATIENT PROTECTION. Where two capacitors are used in series, they shall be3 F) x' a3 c; }0 P C- A) i! A
identical in type (either both Y1 or both Y2) and shall have the same NOMINAL capacitance.: d( j( F6 V4 A* \, M8 W4 p
The capacitor(s) shall meet the dielectric strength for the type of protection for which they are
/ Q8 n( M4 E' A& f: Zbeing used (i.e. one or two MEANS OF PATIENT PROTECTION).
/ ?+ p& t6 u' F; D
K5 {* p6 R$ Y8 q4 {Where the working voltage across a barrier forming a MEANS OF PATIENT PROTECTION is less
, K1 l% L, d9 Q2 z& ythan 42,4 V peak a.c. or 60 V d.c., a single Y1 capacitor is acceptable for two MEANS OF
- ~# k2 F8 X. J& q: BPATIENT PROTECTION. |
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发表于 2012-4-21 08:13
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