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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?! f* Y: S% e) d" A
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?' ^$ {! |! `3 I5 J9 |0 ^. K4 [ |
在IEC61558里,这点是很明确的,但UL5085-3标准里就不太明白;6 A# r+ k0 B% @6 h; X. z* v: ]
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),
7 R& m' }" v4 i) P {& ]9 | 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),
9 n% F' m- }/ s; c) g请问,这种变压器算合格吗? 欢迎大神们指点迷津,谢谢!!!
( g- B7 ]: X1 {4 T, S& W--------UL 5085-3 Clause 33 Overload Heating Test" G: J) v; _( |, F6 h7 k
33.1 General
i# x/ S* p$ v# K% H b2 ~/ l33.1.1 The transformer shall be subjected to the overload tests described
6 O1 I0 d9 ~; G9 bin Clauses 33.2.1 – 33.2.8, asspecified in Tests in Clause 18.
- W) P- ?9 Q9 j7 [/ j$ vA protective device that is relied upon to open the circuit as a result of the( J8 M% N) M- M6 l3 r
tests shall be one that has been investigated for this purpose.( a1 \* {* [* M9 Y. `
33.1.2 The temperature rises specified shall be based on an assumed ambient temperature of 25°C: P6 X: R3 |) |- i' ]. T3 G/ P5 Q0 `" B8 N
(77°F), but a test may be conducted at any ambient temperature of 21 – 30°C (70 – 86°F). 1 h) q( h; z6 R- m) t
If the operationof an automatic thermal control during the test limits the temperatures under observation,
+ [- v9 k( ?8 V9 q% wno temperature higher than 25°C plus the specified maximum rise shall be acceptable.+ d+ Z+ Y* c/ S& ~ l
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