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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。
: N! N& F T* K% R# e" x* y3 l6 iWhen fitting Y capacitors across barriers, the dielectric strength requirement must be
5 l) T7 I/ {. x: L3 J: E5 J6 zconsidered. For example, for voltages in the range of 212 V peak to 354 V peak, two MEANS8 e( [4 s9 D7 i' p
OF PATIENT PROTECTION are required to be tested at 4 000 V a.c. This would then require the6 j0 O' u% L1 \4 w
use of Y1 capacitors. Two Y2 capacitors in series would not withstand this voltage as they are
% Z1 N& q# F/ M2 drated at 1 500 V a.c. each. For voltages below 212 V peak, two Y2 capacitors would suffice as& y+ d- ?; |6 h+ D7 J( l2 G2 A1 m
the dielectric strength requirement is 3 000 V a.c.' |6 {8 y2 N0 I ] n
# g/ u3 U$ Q' i: X) U2 o# I4 \: y. \A Y capacitor (Y1 or Y2 only) complying with IEC 60384-14 is considered equivalent to one2 U4 M) E: A6 D: b
MEANS OF PATIENT PROTECTION. Where two capacitors are used in series, they shall be% x1 ^. p; u! m
identical in type (either both Y1 or both Y2) and shall have the same NOMINAL capacitance.& ~* R; x* |3 @1 c* j! [! Z6 ?2 j
The capacitor(s) shall meet the dielectric strength for the type of protection for which they are
+ R( u8 N% }$ p5 ?being used (i.e. one or two MEANS OF PATIENT PROTECTION).
( D" l- h( z! [3 i( J8 h, r. ]* t7 X' U
Where the working voltage across a barrier forming a MEANS OF PATIENT PROTECTION is less
* M( S/ k8 |( p* M3 bthan 42,4 V peak a.c. or 60 V d.c., a single Y1 capacitor is acceptable for two MEANS OF0 o. l- F y2 x# B- {
PATIENT PROTECTION. |
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发表于 2012-4-21 08:13
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