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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:$ s/ y, \2 a, V/ S& D6 C3 @
For PRIMARY CIRCUITS operating on nominal AC MAINS SUPPLY voltages up to 300 V, if the PEAK WORKING4 }; z/ u4 Y9 u4 A' I+ f
VOLTAGE in the circuit exceeds the peak value of the AC MAINS SUPPLY voltage, the minimum' Z, Q K2 j9 Q
CLEARANCE for the insulation under consideration is the sum of the following two values:
( T o U/ z5 p, w– the minimum CLEARANCE value from table 2H for a WORKING VOLTAGE equal to the AC
; Y1 [% a( u% P: m9 ~MAINS SUPPLY voltage; and4 ?: b7 w" h. l, G, Z, p; | B! D
– the appropriate additional CLEARANCE value from table 2J.( K0 _, i4 H/ k; C" Y4 t& b
(舊標準)' c% a1 X, E0 G% R. `: t
For an AC MAINS SUPPLY not exceeding 300 V r.m.s. (420 V peak):
' y( S6 T6 |' ta) if the PEAK WORKING VOLTAGE does not exceed the peak value of the AC MAINS SUPPLY
' z$ m& g# ~4 M/ R8 lvoltage, minimum CLEARANCES are determined from Table 2K;2 s% w1 y5 O5 C5 w6 e
b) if the PEAK WORKING VOLTAGE exceeds the peak value of the AC MAINS SUPPLY voltage,
r0 s* ?! K, U; A8 @; b, }the minimum CLEARANCE is the sum of the following two values:
- H% I4 [! d: _7 R" E' u; K/ N• the minimum CLEARANCE from Table 2K; and
2 T: b; h( {% z/ D# |) G7 G5 T• the appropriate additional CLEARANCE from Table 2L6 D- l4 S; I2 p9 t
(新標準)
( P6 ?, W# B8 B: k4 Y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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