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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 o0 A6 Q2 h# pWhen fitting Y capacitors across barriers, the dielectric strength requirement must be
8 f; p4 y. W4 [% ^) L* R1 c: K2 \considered. For example, for voltages in the range of 212 V peak to 354 V peak, two MEANS
% T' T7 v8 P; p. v. ]OF PATIENT PROTECTION are required to be tested at 4 000 V a.c. This would then require the ?% m' R! j' I: A6 ]% M K: T0 h
use of Y1 capacitors. Two Y2 capacitors in series would not withstand this voltage as they are
4 Y4 d3 ~, _3 G0 O4 g/ c5 Irated at 1 500 V a.c. each. For voltages below 212 V peak, two Y2 capacitors would suffice as. \9 Q3 m8 K6 H7 j. H
the dielectric strength requirement is 3 000 V a.c.9 t+ e; x' ~) l1 w6 j' B& _
; Q& d' P" S3 P+ W$ f3 ?# k: O/ Y3 GA Y capacitor (Y1 or Y2 only) complying with IEC 60384-14 is considered equivalent to one
* m% a0 w, z w; @MEANS OF PATIENT PROTECTION. Where two capacitors are used in series, they shall be
$ c- D/ ~4 v- f. Widentical in type (either both Y1 or both Y2) and shall have the same NOMINAL capacitance. c2 K! n1 h# ^# @! ?
The capacitor(s) shall meet the dielectric strength for the type of protection for which they are
! H/ ~( J, L+ @being used (i.e. one or two MEANS OF PATIENT PROTECTION).: ~$ n$ n* X7 u0 z0 Z H
( O- o- O' m$ f7 ?! u
Where the working voltage across a barrier forming a MEANS OF PATIENT PROTECTION is less
7 y4 N+ G5 }$ y( w9 ~1 nthan 42,4 V peak a.c. or 60 V d.c., a single Y1 capacitor is acceptable for two MEANS OF; A$ f8 P3 P7 R6 e ?5 O8 J+ n
PATIENT PROTECTION. |
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发表于 2012-4-21 08:13
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