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引用第4楼jacky921于2009-02-20 09:28发表的 :0 e6 b, d9 a6 Q' R
$ D9 i8 W. t* X8 A' D& j8 F* C5 I YRated functioning temperature(Tf): The temperature at which a Thermal Cutoff changes its state of conductivity to open circuit detection curret.The tolerance according to IEC60691 is from +0 to-10℃
0 b7 f& y: i- j; M( ]. V8 D这个是动作温度。; y6 h) M. ]( m# H+ W7 _, ^5 Q
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Fusing(cut)-off temperature: The fusing-off temperature indicates value measured in silicon oil with a temperature increased by 0.5-1℃ per minute and a detective current 100mA or less. : `7 M; d7 ^, |, \( \
0 K o6 m- ~( j7 t" |IEC 60691 标准上没有这个参数要求.这个是厂家自己的。 1 Y% j+ q1 U& W, _5 m
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+ w( b2 C. @. T0 Y. q' ]9 ]Holding temperature(Th): The maximum temperature at which a thermalCutoff will not cause a change in state of conductivity to open circuitwhile conducting rated current for 168 hours. This rating is requiredby safety standards based on IEC60691.
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# y5 b8 z/ a7 p) `2 |根据11.1 Holding temperature, Th5 f- o" }( R4 V7 X- Q5 n, w, z; A
If requested by the manufacturer, the specimen(s) is (are) subjected to the specified time
1 ]+ v8 n( p) L* n% g- Cunder conditions as declared by the manufacturer.
% ]2 n% V" ^7 c3 x: b4 e+ v* Y/ d也就是说厂家不要求,thermal link测试报告可以没有这个数据的。
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; j; s4 f N6 ]7 p4 q/ rMaximum temperature limit(Tm): The maximum temperature at which aThermal Cutoff can be maimtained for 10 minutes without reclosing.Thisrating is requirde by safety standards based on IEC60691.
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8 N. b: n+ E+ n根据60691的定义:# b V% q! d! K! R$ B
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maximum temperature limit, Tm& @0 c4 U; y7 q5 T" h
temperature of the thermal-link stated by the manufacturer, up to which the mechanical and electrical properties of the thermal-link, having changed its state of conductivity, will not be impaired for a given time
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% g7 _3 V+ t; E+ h" k+ `. a; K测试如下:
- c% v) o+ w* }9 y11.3 Maximum temperature limit, Tm0 f1 Y p& \& ]7 \
The specimens shall be subjected to Tm 5! w$ B; @5 P# H" P. G
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period of 2 min, a test voltage of 2 Ur shall be applied between current-carrying parts and any# ~+ M; u( `3 l1 K% U. }# a: D
insulated exposed metal parts, or between terminals of an opened thermal-link.0 {: y3 ?; \' Z$ T
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根据clause 7 (IEC60691),这个参数不一定要标在证书上的。根据定义这个也是根据厂家声称的来做,如果厂家没有声称,是不需要测试的。
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4 k$ C" _4 x- D" u% @* O2 a对于家电产品来说,只要看Tf这个参数。 我看了thermal link 没有temperatuer of surface这个参数,所以它对其安装的表面温度没有要求。也就说我们只要查看正常是theermal link  有没有动作就可以了。
# r+ i. p' K# B; r& S( p; _理由如下:
' d# c0 u4 E$ l% H6 w7 W4 y8 B1。根据60691, clause 10.2做过3天的温湿度的oven试验了。温度为Tf-15.,根据11章, 经过温度和老化试验(ageing)试验后通过耐压试验了。老化温度和时间至少为Tf − 15 K for three weeks加Tf − 10 K for two weeks.所以你不用担心了。. A1 D1 R' h; U
: x" e9 n/ e5 L' Z另外根据60335,thermal link也不一定要认证的了,把它作为weak part,试验重复一边就可以了。
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希望这个对你有帮助,有问题再提
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