|
|
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 U, G0 K/ o4 o/ L
When fitting Y capacitors across barriers, the dielectric strength requirement must be) z6 Q1 F( g2 V
considered. For example, for voltages in the range of 212 V peak to 354 V peak, two MEANS
9 W9 U6 T2 o+ H$ u) ?OF PATIENT PROTECTION are required to be tested at 4 000 V a.c. This would then require the( b# F0 v' U, p: R3 f) c
use of Y1 capacitors. Two Y2 capacitors in series would not withstand this voltage as they are
6 X9 r3 e v3 c' A9 H! w# S* h7 ~# Prated at 1 500 V a.c. each. For voltages below 212 V peak, two Y2 capacitors would suffice as# r1 K% H' J6 a
the dielectric strength requirement is 3 000 V a.c., d i2 |$ Q7 ^) |' h
0 b z; O+ t, C+ X1 y& s5 RA Y capacitor (Y1 or Y2 only) complying with IEC 60384-14 is considered equivalent to one
3 z4 o9 {9 R" V4 L) ?MEANS OF PATIENT PROTECTION. Where two capacitors are used in series, they shall be
' D# B" y) j# I Ridentical in type (either both Y1 or both Y2) and shall have the same NOMINAL capacitance.
1 B+ z: J/ G8 mThe capacitor(s) shall meet the dielectric strength for the type of protection for which they are
1 u. ^# T* b9 S) X4 Wbeing used (i.e. one or two MEANS OF PATIENT PROTECTION).
% b- [6 W$ F# ^3 K8 b* q1 j7 a- g3 O C% L% W* j& Q0 z
Where the working voltage across a barrier forming a MEANS OF PATIENT PROTECTION is less
" x6 p4 C9 C4 S9 i3 y# O1 Jthan 42,4 V peak a.c. or 60 V d.c., a single Y1 capacitor is acceptable for two MEANS OF% h- {$ I; a4 I6 q) i/ E- B
PATIENT PROTECTION. |
|
|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