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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。- S1 G' V& A4 L0 I# a6 G
When fitting Y capacitors across barriers, the dielectric strength requirement must be
: S, _$ A. Y$ U* i% }1 B6 `considered. For example, for voltages in the range of 212 V peak to 354 V peak, two MEANS
- K7 j% q( j& H8 qOF PATIENT PROTECTION are required to be tested at 4 000 V a.c. This would then require the8 O! w2 N3 F" G5 Z- ^
use of Y1 capacitors. Two Y2 capacitors in series would not withstand this voltage as they are
' J7 }. X* T n% Z$ urated at 1 500 V a.c. each. For voltages below 212 V peak, two Y2 capacitors would suffice as
, ^ ]: k3 b* M) r4 ?/ sthe dielectric strength requirement is 3 000 V a.c.
/ n$ ]' _% O' L& q5 c2 c
' {; f& h6 T5 X, z% v3 X% e6 VA Y capacitor (Y1 or Y2 only) complying with IEC 60384-14 is considered equivalent to one$ I1 Z9 [+ @+ I t4 V8 \3 e3 s
MEANS OF PATIENT PROTECTION. Where two capacitors are used in series, they shall be
# G/ F! T' O( x5 ridentical in type (either both Y1 or both Y2) and shall have the same NOMINAL capacitance.
. Y: @4 Q* f5 C3 v0 `, \1 s2 q+ eThe capacitor(s) shall meet the dielectric strength for the type of protection for which they are Z& y# q) j7 a4 @6 v" [+ K
being used (i.e. one or two MEANS OF PATIENT PROTECTION).
5 n+ `# U) ~9 k$ T- s# I
/ ~2 V9 k; ~- ?& i1 x$ aWhere the working voltage across a barrier forming a MEANS OF PATIENT PROTECTION is less
# r) L6 _2 T: z. T3 d; I6 q2 Q0 u, uthan 42,4 V peak a.c. or 60 V d.c., a single Y1 capacitor is acceptable for two MEANS OF7 Z2 ]7 ?3 e0 C3 }9 D8 D7 e: m
PATIENT PROTECTION. |
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发表于 2012-4-21 08:13
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