|
|
這里第一版標準和第二版標準在Clearance上的算法有很大的不同,舊標準一般不用內差法即可,但新標準是需要的 請見下面此處的對比:5 D9 C' s8 t6 ^% M0 k T' Z2 l2 Q
For PRIMARY CIRCUITS operating on nominal AC MAINS SUPPLY voltages up to 300 V, if the PEAK WORKING
: s1 d9 p3 O e/ oVOLTAGE in the circuit exceeds the peak value of the AC MAINS SUPPLY voltage, the minimum6 y; Z, y" c2 Z9 r: ^
CLEARANCE for the insulation under consideration is the sum of the following two values:+ D4 B. ]+ ?) W! c
– the minimum CLEARANCE value from table 2H for a WORKING VOLTAGE equal to the AC8 P# G/ u5 ~1 N9 q1 T4 u4 Q2 ] X2 H
MAINS SUPPLY voltage; and
! y* ~5 G8 B$ j– the appropriate additional CLEARANCE value from table 2J.
9 i- E/ A1 F5 g4 |(舊標準)
J6 @( c% W3 K1 y0 K" mFor an AC MAINS SUPPLY not exceeding 300 V r.m.s. (420 V peak):7 K& |: n" Y, P9 _
a) if the PEAK WORKING VOLTAGE does not exceed the peak value of the AC MAINS SUPPLY
' [/ R; ` g$ O b- h. |voltage, minimum CLEARANCES are determined from Table 2K;& \5 b3 I9 a. j, ]9 z+ A$ a8 { G/ z
b) if the PEAK WORKING VOLTAGE exceeds the peak value of the AC MAINS SUPPLY voltage,: m' K. s( |& u: z4 A3 B
the minimum CLEARANCE is the sum of the following two values:
8 W9 Z: h6 X* f P, K- t: _$ U9 Z. x2 I2 L3 H• the minimum CLEARANCE from Table 2K; and7 a' H; H1 m6 K+ k# `4 r
• the appropriate additional CLEARANCE from Table 2L: d2 y; V$ e0 {
(新標準)
& e& l+ e# V7 o所以Clearance相對新標準嚴苛些了. |
|
/1 
|关于安规|小黑屋|安规QQ群|Archiver|手机版|安规网
( 粤ICP13023453-10 ) 
窥视卡
雷达卡
发表于 2009-2-28 14:02
提升卡
置顶卡
沉默卡
喧嚣卡
变色卡
抢沙发
千斤顶
显身卡