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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。- ]. ~4 \0 ~7 t) w
When fitting Y capacitors across barriers, the dielectric strength requirement must be
0 d1 ?0 m0 W% f7 wconsidered. For example, for voltages in the range of 212 V peak to 354 V peak, two MEANS
+ U* d8 F" Z7 t1 i9 ^ _OF PATIENT PROTECTION are required to be tested at 4 000 V a.c. This would then require the" i# E1 G4 i1 E& ~
use of Y1 capacitors. Two Y2 capacitors in series would not withstand this voltage as they are" Z A% A, N' N) _' [2 ?2 b |' H
rated at 1 500 V a.c. each. For voltages below 212 V peak, two Y2 capacitors would suffice as+ X7 M X" B3 W
the dielectric strength requirement is 3 000 V a.c.
& p) R3 }9 Z8 a. y7 y+ y! u1 g8 e4 S0 A
A Y capacitor (Y1 or Y2 only) complying with IEC 60384-14 is considered equivalent to one" |% ]8 q/ p, U" \
MEANS OF PATIENT PROTECTION. Where two capacitors are used in series, they shall be$ W& m. a, b" z. | W
identical in type (either both Y1 or both Y2) and shall have the same NOMINAL capacitance.- z$ g* u7 T" R% N. K9 k
The capacitor(s) shall meet the dielectric strength for the type of protection for which they are
/ A. a" ?) p4 u" n- Hbeing used (i.e. one or two MEANS OF PATIENT PROTECTION).
) B B9 g, `4 J z, ~0 l( C; L9 k: X9 R9 ~) A: u0 t
Where the working voltage across a barrier forming a MEANS OF PATIENT PROTECTION is less' j+ `& u. K. g7 O
than 42,4 V peak a.c. or 60 V d.c., a single Y1 capacitor is acceptable for two MEANS OF
6 F0 d$ T. s& e6 bPATIENT PROTECTION. |
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发表于 2012-4-21 08:13
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