电气间隙的确定
关于95和65的电气间隙,要不要使用内差法来确定?如果使用,那附件距离还要不要加上? 60950的Clearance是不用内插法的。 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:For PRIMARY CIRCUITS operating on nominal AC MAINS SUPPLY voltages up to 300 V, if the PEAK WORKING
VOLTAGE in the circuit exceeds the peak value of the AC MAINS SUPPLY voltage, the minimum
CLEARANCE for the insulation under consideration is the sum of the following two values:
– the minimum CLEARANCE value from table 2H for a WORKING VOLTAGE equal to the AC
MAINS SUPPLY voltage; and
– the appropriate additional CLEARANCE value from table 2J.
(舊標準)
For an AC MAINS SUPPLY not exceeding 300 V r.m.s. (420 V peak):
a) if the PEAK WORKING VOLTAGE does not exceed the peak value of the AC MAINS SUPPLY
voltage, minimum CLEARANCES are determined from Table 2K;
b) if the PEAK WORKING VOLTAGE exceeds the peak value of the AC MAINS SUPPLY voltage,
the minimum CLEARANCE is the sum of the following two values:
• the minimum CLEARANCE from Table 2K; and
• the appropriate additional CLEARANCE from Table 2L
(新標準)
所以Clearance相對新標準嚴苛些了. 我剛剛說的是60950-1新舊標準 60065和60950里面考虑电气间隙的时候不需要使用内差法,直接用主表格值加上附加表格的值
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