|
|
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。
9 S: W! w7 J" X4 WWhen fitting Y capacitors across barriers, the dielectric strength requirement must be* p; {8 q) ~$ j; s$ `
considered. For example, for voltages in the range of 212 V peak to 354 V peak, two MEANS
2 D: h9 n0 \0 }. U; v; BOF PATIENT PROTECTION are required to be tested at 4 000 V a.c. This would then require the
. U0 F; z7 U8 k6 ause of Y1 capacitors. Two Y2 capacitors in series would not withstand this voltage as they are+ U& _: h2 c+ @
rated at 1 500 V a.c. each. For voltages below 212 V peak, two Y2 capacitors would suffice as& `7 W6 ]% \9 a0 ^7 o1 {
the dielectric strength requirement is 3 000 V a.c.6 Q: l: R, L9 I: d; j: X, r4 T2 o
2 j$ c5 V& F6 lA Y capacitor (Y1 or Y2 only) complying with IEC 60384-14 is considered equivalent to one' u, U1 r$ d2 H$ P' r" e
MEANS OF PATIENT PROTECTION. Where two capacitors are used in series, they shall be
( c, B& _; J" l4 `- {/ lidentical in type (either both Y1 or both Y2) and shall have the same NOMINAL capacitance.
- T$ w1 E5 S+ L( x0 ? BThe capacitor(s) shall meet the dielectric strength for the type of protection for which they are8 Y! \# d" d+ y* D
being used (i.e. one or two MEANS OF PATIENT PROTECTION)., X7 v7 s& I" v* H# y* {
$ V8 u; v( L" g9 c5 ~- M" hWhere the working voltage across a barrier forming a MEANS OF PATIENT PROTECTION is less# i( @; e/ k/ V' s. u
than 42,4 V peak a.c. or 60 V d.c., a single Y1 capacitor is acceptable for two MEANS OF
2 L& i. ]! X/ J, Q- V0 k1 Z( }PATIENT PROTECTION. |
|
/1 
|关于安规|小黑屋|安规QQ群|Archiver|手机版|安规网
( 粤ICP13023453-10 ) 
窥视卡
雷达卡
发表于 2012-4-21 08:13
显身卡
