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引用第2楼roy517于2007-11-06 12:02发表的 :
3 {4 T- V9 S, Y0 [4 Y为什么呢？能说明原因吗？麻烦了！
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14.2.2 The maximum voltages which may be accessible in accordance with 14.2.1(a) are:
9 W. \9 I C! e m$ I6 c2 za) 42.4 V peak for sinusoidal or nonsinusoidal AC;
% Z: G; W) ]/ G7 N$ W9 {3 `' u4 ?b) 60 V for continuous DC;
' N$ v# S& D7 ^7 ?c) 24.8 V peak for DC interrupted at a rate of 200 Hz or less with approximately 50 percent duty cycle; and
# Y+ W. P- A, g+ Id) As indicated in Figure 14.3 for combinations of AC and DC.0 G5 P% o0 c$ J
For 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.
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"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
