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本帖最后由 jjlamshushushu 于 2014-2-17 09:41 编辑 & O9 w) x: Y [0 _* _' @ c2 }
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各位,下面摘录章节的红色字部分如何理解?
& _) O& `1 q3 q: \. s! F6 ^7 m! ?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?* @% N ^/ g! W- r3 V
在IEC61558里,这点是很明确的,但UL5085-3标准里就不太明白;/ a( A! q. d6 k& R1 f
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),! E/ k* I5 c/ 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),
" O6 l% ^1 L) o* k; U5 d请问,这种变压器算合格吗? 欢迎大神们指点迷津,谢谢!!!. W6 A8 ^1 Q- Z6 L
--------UL 5085-3 Clause 33 Overload Heating Test; H6 y4 W+ s: z. w$ }3 k- s' G
33.1 General
! h% J& D( m' ]2 A33.1.1 The transformer shall be subjected to the overload tests described 5 ^; e# \& z. t9 a. G T9 C" I
in Clauses 33.2.1 – 33.2.8, asspecified in Tests in Clause 18. " I2 T. g( Z" d. d
A protective device that is relied upon to open the circuit as a result of the
6 L8 |) n0 Z$ q* l, Ytests shall be one that has been investigated for this purpose.
; b, K5 `% q5 O% X0 F" j33.1.2 The temperature rises specified shall be based on an assumed ambient temperature of 25°C. h5 c3 q L$ ^- b/ ^& ~
(77°F), but a test may be conducted at any ambient temperature of 21 – 30°C (70 – 86°F).
3 T! b3 ^0 k1 w2 HIf the operationof an automatic thermal control during the test limits the temperatures under observation,
, p5 e- r! N( }4 W Xno temperature higher than 25°C plus the specified maximum rise shall be acceptable.2 v2 @) W. a7 }. P& o, h9 H( s. ]$ A) s
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