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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:
$ f- w$ O# Z, k4 {, \6 ?For PRIMARY CIRCUITS operating on nominal AC MAINS SUPPLY voltages up to 300 V, if the PEAK WORKING
; T, _4 F8 B. |6 IVOLTAGE in the circuit exceeds the peak value of the AC MAINS SUPPLY voltage, the minimum
+ m- W- D" j9 J5 l& [5 dCLEARANCE for the insulation under consideration is the sum of the following two values:% \' u' f, M# O( \- u
– the minimum CLEARANCE value from table 2H for a WORKING VOLTAGE equal to the AC
: X5 i, }9 b) x: H, A4 _MAINS SUPPLY voltage; and# ^2 L2 i. c6 @9 p# U9 m
– the appropriate additional CLEARANCE value from table 2J.: l2 J+ X7 r9 Y
(舊標準)
1 P9 j6 N3 M6 wFor an AC MAINS SUPPLY not exceeding 300 V r.m.s. (420 V peak):; q& A1 o9 G/ a4 P& D( N
a) if the PEAK WORKING VOLTAGE does not exceed the peak value of the AC MAINS SUPPLY
1 N9 m" W5 L1 o. T) x. f; e0 fvoltage, minimum CLEARANCES are determined from Table 2K;" D6 g7 j {7 l1 _' C+ W
b) if the PEAK WORKING VOLTAGE exceeds the peak value of the AC MAINS SUPPLY voltage,
& c+ a( l. M- Tthe minimum CLEARANCE is the sum of the following two values:3 u6 d- ?% r3 r* U8 b
• the minimum CLEARANCE from Table 2K; and: A4 I: ^% Z! C9 U& k
• the appropriate additional CLEARANCE from Table 2L* T. B% p. N r! i* x1 s
(新標準)% r6 Y! u: o) B7 }/ I- I
所以Clearance相對新標準嚴苛些了. |
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发表于 2009-2-28 14:02
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