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本帖最后由 jjlamshushushu 于 2014-2-17 09:41 编辑
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0 \/ z3 p: w5 R) q9 k各位,下面摘录章节的红色字部分如何理解?
! L) q4 i/ M* W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?$ y! @9 k/ J- X% i7 i
在IEC61558里,这点是很明确的,但UL5085-3标准里就不太明白;
8 ?" ]* D5 U3 q. O5 W& H6 K 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. j4 B" U* U0 V 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),; z8 V( t& A( V: N7 o
请问,这种变压器算合格吗? 欢迎大神们指点迷津,谢谢!!!) L, @. ?5 I: U! l1 n3 G
--------UL 5085-3 Clause 33 Overload Heating Test
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33.1.1 The transformer shall be subjected to the overload tests described
/ v6 K `- d [# a3 u, p5 g% H* S. {8 Din Clauses 33.2.1 – 33.2.8, asspecified in Tests in Clause 18. * F" }. [. ]' {% v
A protective device that is relied upon to open the circuit as a result of the$ R8 z& l( J# b* I
tests shall be one that has been investigated for this purpose.2 u- d( E. B3 `2 R0 L2 {
33.1.2 The temperature rises specified shall be based on an assumed ambient temperature of 25°C
# |) J& J$ F7 [8 }# T: H(77°F), but a test may be conducted at any ambient temperature of 21 – 30°C (70 – 86°F).
5 a8 t. ~2 Z3 p `) JIf the operationof an automatic thermal control during the test limits the temperatures under observation,
6 e7 r( y ?1 n3 E* ano temperature higher than 25°C plus the specified maximum rise shall be acceptable.1 c# ^5 Q- w0 J8 v& a2 F9 `
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