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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 D( W7 K& A6 n
When fitting Y capacitors across barriers, the dielectric strength requirement must be' V- M0 ^" ?4 u; X. c: z& g+ D
considered. For example, for voltages in the range of 212 V peak to 354 V peak, two MEANS2 F9 ?3 i8 N1 A" a
OF PATIENT PROTECTION are required to be tested at 4 000 V a.c. This would then require the! ?* w( ^" t9 `0 n. X
use of Y1 capacitors. Two Y2 capacitors in series would not withstand this voltage as they are; u6 \! b: |7 A9 I6 w% J" A& Z
rated at 1 500 V a.c. each. For voltages below 212 V peak, two Y2 capacitors would suffice as3 I q0 m7 k% Z
the dielectric strength requirement is 3 000 V a.c.7 d% i& `# Y, w% B/ @) G5 x! j: Y
: J/ y2 T. \1 l% f% _6 d ?( LA Y capacitor (Y1 or Y2 only) complying with IEC 60384-14 is considered equivalent to one4 E( ~( z! B2 O
MEANS OF PATIENT PROTECTION. Where two capacitors are used in series, they shall be
0 m- h3 I! ?4 q7 f! W! c u2 ^5 Kidentical in type (either both Y1 or both Y2) and shall have the same NOMINAL capacitance.
4 z F: u) @% y* Y1 L, B; G4 K pThe capacitor(s) shall meet the dielectric strength for the type of protection for which they are
1 k- g+ Z; _ v8 vbeing used (i.e. one or two MEANS OF PATIENT PROTECTION)., h0 U3 h$ u( K1 l( u% }& }0 H
( F' z9 ~1 k, ?0 J, `% m# _, B
Where the working voltage across a barrier forming a MEANS OF PATIENT PROTECTION is less; Y8 ]) i" z- L9 a' P( e
than 42,4 V peak a.c. or 60 V d.c., a single Y1 capacitor is acceptable for two MEANS OF6 p9 u. F; O: k2 F
PATIENT PROTECTION. |
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发表于 2012-4-21 08:13
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