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本帖最后由 jjlamshushushu 于 2014-2-17 09:41 编辑 . L1 H9 { \. N& g9 V& r
/ ^$ y2 e6 s( ?' e% b6 j$ F+ i各位，下面摘录章节的红色字部分如何理解？
( p8 P( O0 S8 q8 t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？9 T* O# x3 _; N2 h$ v2 [
在IEC61558里，这点是很明确的，但UL5085-3标准里就不太明白；- h( s& z% s* q% l6 W( N3 c
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），
% B3 [( ~. f6 n, m; m1 B% n1 J 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），2 b! c5 d- L5 H% ^' E1 I; S7 a4 ^
请问，这种变压器算合格吗？ 欢迎大神们指点迷津，谢谢！！！+ y; o6 ~! p( ~
--------UL 5085-3 Clause 33 Overload Heating Test( u6 N3 Z: N P) @: ], x1 Z: c
33.1 General
$ U. a1 P0 t) [. q( p0 D- H33.1.1 The transformer shall be subjected to the overload tests described ' _! W1 }4 t' j' j) [
in Clauses 33.2.1 – 33.2.8, asspecified in Tests in Clause 18.
P1 a+ R7 M+ ?/ H% {A protective device that is relied upon to open the circuit as a result of the
8 a4 {* A: E# O" I0 u4 J2 Ftests shall be one that has been investigated for this purpose.2 l$ W# U; T( x4 b$ N
33.1.2 The temperature rises specified shall be based on an assumed ambient temperature of 25°C
( ]4 X8 I s" w7 y% T- C(77°F), but a test may be conducted at any ambient temperature of 21 – 30°C (70 – 86°F).
3 s0 E0 z7 D/ d" tIf the operationof an automatic thermal control during the test limits the temperatures under observation, T2 N: D7 L& H+ B" c4 Y0 J
no temperature higher than 25°C plus the specified maximum rise shall be acceptable.
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发表于 2014-2-17 09:37
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