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本帖最后由 jjlamshushushu 于 2014-2-17 09:41 编辑
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# p1 n# u- }$ X9 Y' {+ D各位,下面摘录章节的红色字部分如何理解?
& ]$ r4 z/ |5 i; t9 p7 X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?
$ H9 M1 K+ w+ w8 N) W" [ 在IEC61558里,这点是很明确的,但UL5085-3标准里就不太明白;6 |& ?9 G2 m+ i5 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),
" F7 h& v- E8 j y5 p1 x 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),
7 L* e+ z3 N$ S! J e" @6 l) h6 ^请问,这种变压器算合格吗? 欢迎大神们指点迷津,谢谢!!!
. x# x7 D& ?( ]% n+ O--------UL 5085-3 Clause 33 Overload Heating Test3 s# J$ Q+ S, m
33.1 General
+ Y& W& i+ B' w$ r33.1.1 The transformer shall be subjected to the overload tests described 0 j" Q$ Z; [# k
in Clauses 33.2.1 – 33.2.8, asspecified in Tests in Clause 18.
o; j7 o ?9 C6 ^A protective device that is relied upon to open the circuit as a result of the
+ q5 a- E: D4 I3 o$ ztests shall be one that has been investigated for this purpose.
! b5 v ~- e. r' k* t0 f; U& O6 H) S33.1.2 The temperature rises specified shall be based on an assumed ambient temperature of 25°C
; P, i2 z5 T- W0 ^! t(77°F), but a test may be conducted at any ambient temperature of 21 – 30°C (70 – 86°F). ) s% M$ t% g6 s( R5 p ^
If the operationof an automatic thermal control during the test limits the temperatures under observation,
5 H3 ~3 j; g2 ]/ G$ ^; zno temperature higher than 25°C plus the specified maximum rise shall be acceptable.# h" W5 {1 a/ [- d$ f, v9 [$ T
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