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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:
) ?( X5 j& {1 N- G" u; W4 [For PRIMARY CIRCUITS operating on nominal AC MAINS SUPPLY voltages up to 300 V, if the PEAK WORKING8 w$ k. z. t9 e5 m: W. ]
VOLTAGE in the circuit exceeds the peak value of the AC MAINS SUPPLY voltage, the minimum
$ k* x2 R( _) _: bCLEARANCE for the insulation under consideration is the sum of the following two values:
8 X0 u- W7 t( Q7 r# b– the minimum CLEARANCE value from table 2H for a WORKING VOLTAGE equal to the AC, \& S8 ?4 ]9 Y: N! ~
MAINS SUPPLY voltage; and
" g" z% K& @: K' U2 Y, r0 }- N% T– the appropriate additional CLEARANCE value from table 2J.4 I, A8 ?( J/ f- C- L, N' q
(舊標準)
! ]) O. V* Q1 T, I" G% t* LFor an AC MAINS SUPPLY not exceeding 300 V r.m.s. (420 V peak):; \: z) @: w! Z4 V j; f
a) if the PEAK WORKING VOLTAGE does not exceed the peak value of the AC MAINS SUPPLY
, u- }7 J* Z3 _/ q: e; N) wvoltage, minimum CLEARANCES are determined from Table 2K;
8 ^" f( J' r- `; f& Pb) if the PEAK WORKING VOLTAGE exceeds the peak value of the AC MAINS SUPPLY voltage,) |3 w8 f. H Z* U2 p
the minimum CLEARANCE is the sum of the following two values:
4 Y+ e& L) I- A* v. Q5 ?; }• the minimum CLEARANCE from Table 2K; and) I5 x" R* i& E+ [
• the appropriate additional CLEARANCE from Table 2L' p, s3 a) @7 Y
(新標準)8 A& f& Y) c* u- r! m
所以Clearance相對新標準嚴苛些了. |
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