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本帖最后由 jjlamshushushu 于 2014-2-17 09:41 编辑
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$ z6 x6 F" k; B& ^2 V各位,下面摘录章节的红色字部分如何理解?( }( C8 f' Z9 R9 o: i( o7 d
比如,变压器的工作环境温度为105°C,那么这个Overheating Test就应该在105°C环境下进行吗?
* O" {6 x9 g7 J# {. \! M 在IEC61558里,这点是很明确的,但UL5085-3标准里就不太明白;! s( p0 W/ t& o& z3 `8 ~' ?1 | f
现在我们有一款UL5085-3的变压器,在25°C下进行冷态短路测试出现冒烟流脓现象(保护装置失灵)," U, B& t( x( a9 e% E
而在105°C环境温度下进行温升稳定以后再热态短路测试就是正常的(正常保护了)," P- O; D' G& x, O9 m7 b5 Y3 k
请问,这种变压器算合格吗? 欢迎大神们指点迷津,谢谢!!!2 F& y1 W0 ?7 x6 x% G6 |3 R
--------UL 5085-3 Clause 33 Overload Heating Test4 Z( D* y# R: n3 c8 Y+ K5 W2 ~
33.1 General
0 e1 e! E/ m7 R9 C0 _33.1.1 The transformer shall be subjected to the overload tests described
' [; o7 i* V7 U; _- xin Clauses 33.2.1 – 33.2.8, asspecified in Tests in Clause 18. ) S, p8 a4 A( J: A; s3 Z
A protective device that is relied upon to open the circuit as a result of the
0 f3 F9 p. f/ C% v& c9 Xtests shall be one that has been investigated for this purpose.. ~4 x1 ?$ i) D+ v
33.1.2 The temperature rises specified shall be based on an assumed ambient temperature of 25°C5 i$ e8 c6 f/ L$ c d
(77°F), but a test may be conducted at any ambient temperature of 21 – 30°C (70 – 86°F).
: j8 K) c" T& r+ P/ R) JIf the operationof an automatic thermal control during the test limits the temperatures under observation, ) U; i* _1 x! P
no temperature higher than 25°C plus the specified maximum rise shall be acceptable.
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