|
引用第3楼gina于2008-03-07 10:18发表的 :
# i# z2 R. x3 \# M如果按标准字面理解:; c5 |% W }0 L! v+ z) l/ M
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。
* Z! C( A3 a/ }- O6 _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。9 _; b/ g4 a$ R: [% M) w
1 u+ H2 i7 o3 P0 V$ s
根据IEC60335;
9 U3 w& l3 }- M9 @6 w( n; J$ G7.5 For appliances marked with more than one rated voltage or with one or more rated
4 ?) q( V4 n% {$ l% w. _voltage ranges, the rated power input or rated current for each of these voltages or ranges O4 ^+ C! b* o$ @) X {3 d7 l
shall be marked. However, if the difference between the limits of a rated voltage range does
9 ]8 J; F( ~$ G' w- ~not exceed 10 % of the arithmetic mean value of the range, the marking for rated power9 {3 M& Q$ I3 o9 c$ m
input or rated current may be related to the arithmetic mean value of the range.
/ ^- D6 ^2 p6 \% R9 I: v0 r4 k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。
8 D b8 H. }" H) y9 m9 h
; r3 Q8 g; A# R3 Q7 x但根据5.8.4 For appliances marked with a rated voltage range and rated power input
4 P# G0 ], Y5 x) ]3 lcorresponding to the mean of the rated voltage range, when it is specified that the power
( }. A. h. Q' ?6 winput is equal to rated power input multiplied by a factor, the appliance is operated at
+ P3 T4 ^) g! A1 X6 p; `+ z– the calculated power input corresponding to the upper limit of the rated voltage range
" n1 l: [) o/ d# Z9 imultiplied by this factor, if greater than 1;6 Y3 w$ |' j# W9 Z1 v
– the calculated power input corresponding to the lower limit of the rated voltage range
4 Y$ p% V8 y. a3 R# v& _0 q" l Jmultiplied by this factor, if smaller than 1.When a factor is not specified, the power input corresponds to the power input at the most G2 e/ {+ z5 R# j0 M: S; L
unfavourable voltage within the rated voltage range.
' ]+ [- ]& {' {; k" [& q5 d3 U* M
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。! l- \4 C# [% J$ a2 Q, q
做19.3时,所乘系数大于1,所以应按1.24×(240 / 230 )^2×2400W来测试。. O8 K I5 X4 H9 L1 w
# @. y; O, ~' M+ e: x
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。
$ O) J1 O) s" X! U1 g, M9 p( ]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?)! |
|