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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:
/ ]. ]3 q! c- {For PRIMARY CIRCUITS operating on nominal AC MAINS SUPPLY voltages up to 300 V, if the PEAK WORKING, z' K! S" w& k; x& p" i4 M& B8 U
VOLTAGE in the circuit exceeds the peak value of the AC MAINS SUPPLY voltage, the minimum
- q7 X1 T8 x: S. Y4 jCLEARANCE for the insulation under consideration is the sum of the following two values:
: i' ?8 R. M* R$ R– the minimum CLEARANCE value from table 2H for a WORKING VOLTAGE equal to the AC
8 U* l3 H& H+ p9 ~1 |. @8 G& C- j# c& SMAINS SUPPLY voltage; and. k: n( x0 p6 ~: M& l: V
– the appropriate additional CLEARANCE value from table 2J.
5 [2 n2 M/ p2 o p% o! F(舊標準)
& s4 e8 X) P9 }: ], @0 P* BFor an AC MAINS SUPPLY not exceeding 300 V r.m.s. (420 V peak):* `) o& N4 ^ y: i
a) if the PEAK WORKING VOLTAGE does not exceed the peak value of the AC MAINS SUPPLY
( a' y S- G& ^7 N% u s. u: Zvoltage, minimum CLEARANCES are determined from Table 2K;
4 N+ ]/ i* i; R9 P/ \# w' Tb) if the PEAK WORKING VOLTAGE exceeds the peak value of the AC MAINS SUPPLY voltage,
, Y O+ n3 p+ J& X8 N+ tthe minimum CLEARANCE is the sum of the following two values:# { E. _4 p1 @6 Q, n* d- O
• the minimum CLEARANCE from Table 2K; and" z1 x" I% o8 h
• the appropriate additional CLEARANCE from Table 2L
1 }& H2 a; q r$ D% {(新標準)1 }9 {. A3 D, l* G9 F* E' T
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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