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本帖最后由 jjlamshushushu 于 2014-2-17 09:41 编辑
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各位,下面摘录章节的红色字部分如何理解?
2 K v( R, d: D G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?2 _& r$ Y; Q9 e H5 [$ w. F& e
在IEC61558里,这点是很明确的,但UL5085-3标准里就不太明白;6 h+ y) C8 l% [ M' z! ]
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),/ D8 Q; r* X* X9 }
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),! ^& O, |0 f- q) \7 O% w! ~% x
请问,这种变压器算合格吗? 欢迎大神们指点迷津,谢谢!!!/ w3 d. \% [8 E9 B
--------UL 5085-3 Clause 33 Overload Heating Test7 C% n3 e1 b! Z8 y/ f! J* q+ \& J
33.1 General1 g& B+ o& A& W+ a9 M
33.1.1 The transformer shall be subjected to the overload tests described ' m# t0 Y' F* K
in Clauses 33.2.1 – 33.2.8, asspecified in Tests in Clause 18. * ]7 F* g1 o9 b8 j0 ]: T! W6 y
A protective device that is relied upon to open the circuit as a result of the
" E; r5 N( z- I/ U( d& ntests shall be one that has been investigated for this purpose.
. J3 n, b# i% S" U6 u% \( V33.1.2 The temperature rises specified shall be based on an assumed ambient temperature of 25°C
3 o& P: x; S% e(77°F), but a test may be conducted at any ambient temperature of 21 – 30°C (70 – 86°F). 5 ^& M* n, ]; b
If the operationof an automatic thermal control during the test limits the temperatures under observation,
4 }( O, c( {' u' l/ Fno temperature higher than 25°C plus the specified maximum rise shall be acceptable.0 J9 v- O$ r" H
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