关于热熔断器Thermal link温升测试疑问---怎样判断其温升通过？ - 安规网

引用第1楼书海漫步于2009-02-19 23:28发表的 :
3 u, b$ ]% Y' K' g i. C专业！能解释一下什么是holding temperature 吗？

引用第4楼jacky921于2009-02-20 09:28发表的  :
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: X9 S* |7 R: f8 a( o; j) B0 E- t' RRated 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℃
) u  s& X7 Y1 C# B, p这个是动作温度。" u& K* H0 ?8 b' Q4 k! X

! c0 J$ B0 ~2 A. v! K* \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. / B: r6 x% `9 x/ Q
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IEC 60691 标准上没有这个参数要求.这个是厂家自己的。 / c6 m5 W* q7 D4 j
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6 C5 G3 c5 T0 x, iHolding 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, Th  f. l0 T. d: M' r2 N( C" h
If requested by the manufacturer, the specimen(s) is (are) subjected to the specified time
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也就是说厂家不要求，thermal link测试报告可以没有这个数据的。/ w$ o5 H1 C  \, w: K6 Z2 P
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Maximum 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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根据60691的定义：
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* L0 Q7 k0 v- t% E1 pmaximum temperature limit, Tm, _* D/ n! a; a) D
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 time1 U5 D% f% C7 e/ X' W0 c% v
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测试如下：' T% E. f; ~2 C% S, G4 o8 s. E
11.3 Maximum temperature limit, Tm; B5 f$ J( ?$ U: k( X
The specimens shall be subjected to Tm 5
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  e" m( N" Q' F) m. i6 k9 _− °C for a period of 10 min, and, during a further9 Z3 i9 |# {2 D: q* k, n0 d
period of 2 min, a test voltage of 2 Ur shall be applied between current-carrying parts and any. j# P# [; ~( R0 {
insulated exposed metal parts, or between terminals of an opened thermal-link.
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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。0 X( F, G6 Q) X

/ H  E4 \1 [' w' s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。5 J2 Z$ g7 V" R' c6 S
理由如下：
- E3 A3 {+ m5 z/ l  m4 n  u- n1。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。* g, @1 x7 B6 T. V# Z2 y* ?& M/ c
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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。9 G; e* M* z; l( z& r

; O3 F3 }- b/ a" ~+ q" d% }希望这个对你有帮助，有问题再提6 T8 `5 [* [. a% _" w

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引用第7楼jacky921于2009-02-20 11:47发表的 :6 w9 M2 y' r8 N' Y% i
多谢楼上详细解答，如果参照IEC60335, 热熔断器Thermal link判断其温升通过是否可. |; E) o, x) j, l; z
总结为：
+ P+ S9 m5 _* S& n只要条款11正常温升测试中热熔断器Thermal link不断路，就可判定测试通过？
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k) o* S* A8 z' K* W6 ?( J一般情况下， thermal link上都会有一个绝缘套管或其他的绝缘的，因为引脚是带电件，要注意测试那个绝缘的温升的。8 n7 Y, X7 E" e x
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下周打算发表关于热熔断器Tm最大过冲温度maximum overshoot temperature的主题6 ?5 ]! p- w' a+ W" G
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会关注的
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