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本帖最后由 jjlamshushushu 于 2014-2-17 09:41 编辑
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) p; S' u# }% ~3 _- [. D) t各位,下面摘录章节的红色字部分如何理解?
4 k6 N2 i6 [% Z3 F8 }9 o. i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?
/ N6 k" `9 q" C& ]+ k 在IEC61558里,这点是很明确的,但UL5085-3标准里就不太明白;
! p' P7 B8 D- ?9 I# Y( y 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),( Z, r4 Q2 |6 ~8 L
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),
$ }) F# W& B$ x z) A请问,这种变压器算合格吗? 欢迎大神们指点迷津,谢谢!!!; ^* o# T# n6 x' \& ~
--------UL 5085-3 Clause 33 Overload Heating Test+ y; l$ c. d, U4 b9 d
33.1 General
3 A. U5 f4 m J/ `4 i/ x33.1.1 The transformer shall be subjected to the overload tests described
$ v/ ?& P# s- z9 n, kin Clauses 33.2.1 – 33.2.8, asspecified in Tests in Clause 18. 4 {5 R, b/ b9 Z& Q+ P
A protective device that is relied upon to open the circuit as a result of the$ |+ n: r7 u9 y: Z( `2 X
tests shall be one that has been investigated for this purpose.
7 p) y" y4 K$ j. l! H1 U$ N- h33.1.2 The temperature rises specified shall be based on an assumed ambient temperature of 25°C$ _- a* K: |8 E1 r
(77°F), but a test may be conducted at any ambient temperature of 21 – 30°C (70 – 86°F).
( B! R* G, F6 c. @If the operationof an automatic thermal control during the test limits the temperatures under observation,
# ^" S* A2 I9 j7 u) B; s% X2 g* d. @no temperature higher than 25°C plus the specified maximum rise shall be acceptable.& X9 z& q, L1 x& L' U' w
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