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引用第3楼gina于2008-03-07 10:18发表的 :
1 E x" Z. O& H如果按标准字面理解:7 `( T5 S4 u+ j9 f; l- K, U- w
11.4 Heating appliances are operated under normal operation and at 1,15 times rated power input. 就直接按1.15×2400 (额定功率)测试即可,但是大多数有权威的认证机构却不按这个简单的理解,他们认为2400W是一个平均功率------即是230V所对应的功率,那么折算成240V下面的功率就应该是:(240 / 230)^2×2400W,也就是按1.15×(240 / 230)^2×2400W 的条件测正常温升(Cl. 11.8);在做Cl. 19.2时同样也是按照0.85×(240 / 230)^2×2400W来测试的,而不是0.85×(220 / 230 )^2×2400W。! @1 {' M* v: w- G. [, L* |- W
曾经做过一个保温板的产品就是按以上要求做的,附上当时的测试计划! 前面基本正确,后面有点不妥。! N( \8 ?: R1 _' T& k: F" v
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根据IEC60335;$ R1 y3 x1 t! d j
7.5 For appliances marked with more than one rated voltage or with one or more rated
1 G( M* y1 }* }9 w( L9 }7 Yvoltage ranges, the rated power input or rated current for each of these voltages or ranges' q( D* n% h7 r
shall be marked. However, if the difference between the limits of a rated voltage range does8 u( _, ^! [& e+ H) L
not exceed 10 % of the arithmetic mean value of the range, the marking for rated power
( X4 |2 r, k7 ^. E8 J$ l9 Winput or rated current may be related to the arithmetic mean value of the range.* }2 y E- b; l5 t7 D
所以2400W是对应额定电压范围平均值的额定输入功率。11.4做的没错。
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但根据5.8.4 For appliances marked with a rated voltage range and rated power input+ p5 p; ?/ p- G+ k; f1 C
corresponding to the mean of the rated voltage range, when it is specified that the power
/ C, B$ c) I. N! A" j* P0 Q$ zinput is equal to rated power input multiplied by a factor, the appliance is operated at
3 B# k, ?3 i4 W+ h/ p2 l– the calculated power input corresponding to the upper limit of the rated voltage range
]! w$ M+ g5 Z2 _; o# B- Zmultiplied by this factor, if greater than 1;
* Y( |/ ^4 \! T' V! ~ x! d– the calculated power input corresponding to the lower limit of the rated voltage range
0 B9 @) K" K- j+ g( X" C0 K' z: [- a: F* {, Amultiplied by this factor, if smaller than 1.When a factor is not specified, the power input corresponds to the power input at the most/ K: H1 k- l" N
unfavourable voltage within the rated voltage range.# E% q' G% h1 }2 W
! h6 @+ x& ?" o) U做19.2时,所乘系数小于1,所以按照0.85×(220 / 230 )^2×2400W来测试是对的。1 g' r! P9 t* |; p' ~! s1 g; b
做19.3时,所乘系数大于1,所以应按1.24×(240 / 230 )^2×2400W来测试。/ U: o$ X+ M% g% v" Z9 F7 v
, s8 }+ t$ P. {( `注意:19.2 \\19.3是以功率为基准,但调的是电压,一个是欠压,一个是过压,都要考虑最不利情况。
6 d$ j j+ u2 ^/ {" d: E! C9 X! G电器的安全不是总是电压越高越危险,也有欠压危险的可能(考虑在什么情况下出现?)! |
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