|
|
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:
: ]' v# T/ Y% @; n$ _% cFor PRIMARY CIRCUITS operating on nominal AC MAINS SUPPLY voltages up to 300 V, if the PEAK WORKING3 j1 E( G6 G$ V+ \6 \
VOLTAGE in the circuit exceeds the peak value of the AC MAINS SUPPLY voltage, the minimum3 w# }- q9 I( z3 d5 z% c6 L
CLEARANCE for the insulation under consideration is the sum of the following two values:- q m3 y- A% p# b6 C
– the minimum CLEARANCE value from table 2H for a WORKING VOLTAGE equal to the AC
8 _% w8 ~* j: B# sMAINS SUPPLY voltage; and
9 r( x6 `& R9 y0 j* A1 k7 E! M– the appropriate additional CLEARANCE value from table 2J.
! X) x/ j& \( w8 m0 D# m(舊標準)5 a# U/ N- P0 Y- g" k# j7 ]
For an AC MAINS SUPPLY not exceeding 300 V r.m.s. (420 V peak):
$ M5 ^) q9 G0 z$ na) if the PEAK WORKING VOLTAGE does not exceed the peak value of the AC MAINS SUPPLY) Q1 D, O# }9 I7 {
voltage, minimum CLEARANCES are determined from Table 2K;) a* ]' |0 w! W( e7 k
b) if the PEAK WORKING VOLTAGE exceeds the peak value of the AC MAINS SUPPLY voltage,
7 C3 a# Y1 R5 S2 E+ B \- Othe minimum CLEARANCE is the sum of the following two values:) ]/ x$ y( J2 b9 S x/ E
• the minimum CLEARANCE from Table 2K; and: Q- ^$ ^$ M6 L( }8 L, d/ b7 i
• the appropriate additional CLEARANCE from Table 2L# M+ V; q# U4 \ B6 |* V2 q) W& S
(新標準)
3 ~& _- l3 }. s: y% s; B所以Clearance相對新標準嚴苛些了. |
|
/2 
|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
收藏
分享
好帖
鸡蛋
提升卡
置顶卡
沉默卡
喧嚣卡
变色卡
抢沙发
千斤顶
显身卡