/ x& I8 W8 K; a: ][attach]73539[/attach][attach]73540[/attach]作者: 至尊宝 时间: 2012-5-26 12:51
在65和4943中,要求不一样。。。。真是很难判断是否符合标准要求作者: 329485466 时间: 2012-5-27 11:06
为什么两个不同容量的电容不可串联?, a# ~& O/ Z/ G$ j
根据我的理解是,因容量不同,而容抗不同,串联一起电容上的分压不同,可能其中的一个电容因分压不均导致超压使用,继而引发危险。& M k3 U# a) m5 q* w/ b0 Q
但上述情况中,用一个Y1电容都可以满足,就不存在超压使用的情况。% R: U7 t. v7 j6 @( M% }( z9 s
950中提到两个电容可以串联,但容量要相同,不知是不是考虑的这点,但65中就根本没提到。* m+ I- L t( M5 Q
+ E* v3 A+ A Q* K6 e 作者: bob_dai 时间: 2012-5-29 23:59
IEC60950-1:2005 AM1已经修改了要求,并不要求两个电容一定是容值相同了:$ ?2 ]7 K$ p$ W; G; a7 {
修改前:9 W- L6 z2 B5 o2 K
7 If two or more capacitors are used in series, they shall ! `$ B* R, g# ]6 f: W% x2 p/ W# Z- all have the same nominal capacitance value;9 b7 {6 ?7 m" a0 L6 x+ a$ h
- each be rated for the total RMS WORKING VOLTAGE across the insulation; and 2 i0 L( o5 m2 l4 E) v- comply with the other rules above. * r+ w% U L8 X: i \- n" N修改后:1 k4 E9 k" ]$ O5 G( D5 j
7 If two or more capacitors are used in series, all of the following apply:/ x2 m: w" L* C) [! k! ~ A) @! x
– under single fault conditions, the voltage on each of the remaining individual capacitors shall not exceed the voltage rating of the relevant individual capacitor; / E$ h9 x9 n1 K: S1 l: p– for BASIC INSULATION or SUPPLEMENTARY INSULATION, the sum of the peak impulse test voltages of all capacitors shall be not less than the peak value of the test voltage (not the r.m.s. voltage) of Table 5B, or the peak value of the test voltage of Table 5C, as applicable;: C$ L. r5 f9 E5 ^
– for BASIC INSULATION or SUPPLEMENTARY INSULATION, the sum of the r.m.s. test voltages of all capacitors shall be not less than the required r.m.s. test voltage of Table 5B, or the equivalent r.m.s. test voltage (not the peak voltage) of Table 5C, as applicable;2 I5 @- j9 W. m
– for REINFORCED INSULATION, the sum of the peak impulse test voltages of all capacitors shall be not less than the peak value of the test voltage (not the r.m.s. voltage) of Table 5B, or the peak value of the test voltage of Table 5C, as applicable; 8 c) G9 h& n0 |4 j" @5 ]- `! Q/ p– for REINFORCED INSULATION, the sum of the r.m.s. test voltages of all capacitors shall be not less than the required r.m.s. test voltage of Table 5B, or the equivalent r.m.s. test voltage (not the peak voltage) of Table 5C, as applicable; $ j# e& E9 c+ p) i7 T8 A4 C– they shall comply with the other rules above.作者: 杀手 时间: 2012-5-30 23:33
跟踪关注中,对于这个问题也有疑问,对上面的解释心有迷惑,但又说不出,继续关注作者: 平凡 时间: 2012-5-31 14:16
的確最新的60950:2009版,已經沒有這樣要求了作者: Susanhjwang 时间: 2012-6-2 11:26
安规新人关注中。。。作者: canghai 时间: 2012-6-4 20:51
不符合,标准里面有严格要求。作者: 山炮 时间: 2012-6-4 21:20
呵呵,当专家们费尽心思,苦思冥想终于找到解释两个电容容量必须一致的科学理论根据,他娘的,变了,又得苦思冥想去找两个电容容量不必一致的科学理论根据。作者: sharkxiao 时间: 2012-6-11 09:13
山炮 发表于 2012-5-25 12:59 % h: F1 ?* z1 D: M. `& S; y
同意楼上。