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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。1 F& q/ \' h: m; q
When fitting Y capacitors across barriers, the dielectric strength requirement must be
! v! E4 W& y) Q# X% ~considered. For example, for voltages in the range of 212 V peak to 354 V peak, two MEANS
/ @$ F' V F+ S6 X# r1 Q TOF PATIENT PROTECTION are required to be tested at 4 000 V a.c. This would then require the) r+ A3 W+ @) O& S
use of Y1 capacitors. Two Y2 capacitors in series would not withstand this voltage as they are9 X. `. r7 J# A9 N
rated at 1 500 V a.c. each. For voltages below 212 V peak, two Y2 capacitors would suffice as* h& |0 ~8 w2 c# G% F& v
the dielectric strength requirement is 3 000 V a.c.* y7 j; o2 P7 l$ H7 Q
/ s, m3 l' {' w5 k6 F3 @& HA Y capacitor (Y1 or Y2 only) complying with IEC 60384-14 is considered equivalent to one2 A7 j; R' @' d6 `1 N
MEANS OF PATIENT PROTECTION. Where two capacitors are used in series, they shall be, h" Y$ Y. g" L; v: q
identical in type (either both Y1 or both Y2) and shall have the same NOMINAL capacitance.& @- O% L0 K) [: D( d9 t; r: A
The capacitor(s) shall meet the dielectric strength for the type of protection for which they are
4 j# x+ H$ X$ Dbeing used (i.e. one or two MEANS OF PATIENT PROTECTION).3 b3 S. z) v, F
+ G5 P h' j/ A# q, ]/ p
Where the working voltage across a barrier forming a MEANS OF PATIENT PROTECTION is less1 p) J- S r9 c! |, o& k; w
than 42,4 V peak a.c. or 60 V d.c., a single Y1 capacitor is acceptable for two MEANS OF
" k( z- c* d( S1 UPATIENT PROTECTION. |
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发表于 2012-4-21 08:13
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