|
|
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。
. g( Y* ^/ L, M" q- rWhen fitting Y capacitors across barriers, the dielectric strength requirement must be( y* M5 R8 y! I, J- [" L" q
considered. For example, for voltages in the range of 212 V peak to 354 V peak, two MEANS
' x9 g, q/ H! H# w; K9 N4 ?OF PATIENT PROTECTION are required to be tested at 4 000 V a.c. This would then require the
# \9 z+ Y( @ ?. l' Nuse of Y1 capacitors. Two Y2 capacitors in series would not withstand this voltage as they are# p ?, D/ C9 e7 Z S' n. b
rated at 1 500 V a.c. each. For voltages below 212 V peak, two Y2 capacitors would suffice as9 U/ i7 w. w5 f! P
the dielectric strength requirement is 3 000 V a.c./ w. {/ g$ i/ C/ g+ }6 a. A
; R! T3 Y* \& F- `: {+ VA Y capacitor (Y1 or Y2 only) complying with IEC 60384-14 is considered equivalent to one7 w$ p- w: D2 X% E- e
MEANS OF PATIENT PROTECTION. Where two capacitors are used in series, they shall be
; I) E5 m9 l$ H! Fidentical in type (either both Y1 or both Y2) and shall have the same NOMINAL capacitance. m/ b/ d y) {8 Y
The capacitor(s) shall meet the dielectric strength for the type of protection for which they are x5 T! D) F+ [9 u
being used (i.e. one or two MEANS OF PATIENT PROTECTION).8 Q7 F0 R5 G( Y* K" |# z' v
, ^9 c! J; W& S6 z; K$ uWhere the working voltage across a barrier forming a MEANS OF PATIENT PROTECTION is less0 f# B! [$ M; e/ I/ Y. W: m
than 42,4 V peak a.c. or 60 V d.c., a single Y1 capacitor is acceptable for two MEANS OF
0 r- |( z. r3 q( ?( S5 APATIENT PROTECTION. |
|