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引用第2楼roy517于2007-11-06 12:02发表的 :
% o9 X: Y$ |5 z! Z$ k2 b为什么呢？能说明原因吗？麻烦了！
UL1310. `. I- b' i$ i& G
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14.2.2 The maximum voltages which may be accessible in accordance with 14.2.1(a) are:
% H. m1 F# ~$ g, V* u/ ka) 42.4 V peak for sinusoidal or nonsinusoidal AC;
/ w0 T1 L, C% C" mb) 60 V for continuous DC;
+ C; \5 B* o% Z3 D; ?" J/ a {c) 24.8 V peak for DC interrupted at a rate of 200 Hz or less with approximately 50 percent duty cycle; and7 b& U% X0 F7 O& U
d) As indicated in Figure 14.3 for combinations of AC and DC.
: F" I/ _$ q; Z7 aFor the purpose of this requirement, initial transients lasting less than 200 milliseconds may be ignored. Since short term peak voltage is of interest during tests involving a fault, voltages are to be monitored by using a storage oscilloscope for the first two seconds after any fault is introduced.% Z: [3 q6 H, j
* W4 Q0 W. e5 R0 e F% _3 e
! [* F- q6 a0 `. u4 p; |/ F
"Since short term peak voltage is of interest during tests involving a fault," |
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发表于 2007-11-6 11:53
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发表于 2007-11-6 12:20
