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引用第4楼jacky921于2009-02-20 09:28发表的 :
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Rated 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℃/ j2 I% s& z' k% B" E/ _" `
这个是动作温度。
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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. ) S' R8 d0 B5 y" u9 E
* {9 W/ k2 q4 F& v/ E/ ZIEC 60691 标准上没有这个参数要求.这个是厂家自己的。
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) N! ]3 [ r( J' Q4 VHolding 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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根据11.1 Holding temperature, Th2 @' T& X" B# ?4 r
If requested by the manufacturer, the specimen(s) is (are) subjected to the specified time+ D% A/ {1 G/ u
under conditions as declared by the manufacturer.: t6 q; c! }, W% s# 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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% ^* y; M3 d) v4 K, U9 l3 Y& |* KMaximum 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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/ ^2 p/ Y* [, d9 N/ F( ^( m0 O: \根据60691的定义:! A8 e6 w: Y* Z
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maximum temperature limit, Tm
9 z6 X. L8 G4 f/ F; ~$ otemperature 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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11.3 Maximum temperature limit, Tm) P+ s3 T. W1 k/ V) L( w1 u
The specimens shall be subjected to Tm 5* a- M6 e- E1 w
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− °C for a period of 10 min, and, during a further f# I" \2 H1 f& K/ O3 A
period of 2 min, a test voltage of 2 Ur shall be applied between current-carrying parts and any. ?1 u& z, J* {0 r+ l4 _* s9 T
insulated exposed metal parts, or between terminals of an opened thermal-link.% e, |( K7 ?: C8 B* n4 G, P
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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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& s! Z+ e0 M3 E9 ]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。
- B# h0 \4 W# R6 q* A理由如下:" T. Y, c) j- {4 k y4 E0 | p
1。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。
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9 i- e$ S, N. |& W ]' g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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9 D& I; W, A' j1 ~* W+ a希望这个对你有帮助,有问题再提! r7 y/ q5 c& V% J5 {
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