kevinyang26 发表于 2012-7-19 20:39

关于变压器绕组温升限值

有一个开关电源电路中的变压器绕组，线圈用的是UEW线，class B, 在43度的环境下测试,1.TUV sud 用EN60065,限值取的是77K, 2.TUV PS用EN60335,限值取的是78K,第一个是否是EN60065 Table 3,d)中的85K-(43-35)C=77K,而第二个EN60335是怎么计算的,
85K（class 130)-(25-(43-25))=78K??

山炮 发表于 2012-7-19 20:59

打错字。95一43一25=77

sharkxiao 发表于 2012-7-20 08:43

找认证机构询问啊？

kevinyang26 发表于 2012-7-20 08:52

本帖最后由 kevinyang26 于 2012-7-20 13:49 编辑

山炮 发表于 2012-7-19 20:59 static/image/common/back.gif
打错字。95一43一25=77

請問,95K是參考哪里,我是用熱電偶測的,正常操作不是環溫15-35
在IEC61347-2-13,因為它的溫升是參考60065的,里面有這么一句"The values of the temperature rise in Table 3 of IEC 60065, second and third column, are based on a maximum ambient temperature of 35 °C."是何意思?

tom369tom 发表于 2012-7-20 09:17

找南德问一下便知！:)

head0819 发表于 2012-7-20 09:22

kevinyang26 发表于 2012-7-20 08:52 static/image/common/back.gif
請問,95K是參考哪里,我是用熱電偶測的,正常操作不是環溫15-35

60335中Class B的线圈用热电阻来测量，温升限值就是95K。
但是怎么算出个78K来，还要真的问一下机构！

kevinyang26 发表于 2012-7-31 14:51

補充一個問題，大家看一下以下有什么區別:
EN60598-1: Parts of insulating material retaining current-carrying parts or SELV parts in position, and
external parts of insulating material providing protection against electric shock shall be
resistant to flame and ignition.
EN61347-1: External parts of insulating material providing protection against electric shock and
parts of insulating material retaining live parts in position shall be sufficiently resistant to
flame and ignition/fire.

kevinyang26 发表于 2012-7-31 15:01

這是我找到的定義：
Alive or live (energized). The term means electrically connected to a source of potential difference, or electrically charged so as to have a potential significantly different from that of the earth in the vicinity. The term "live" is sometimes used in place of the term "current-carrying," where the intent is clear, to avoid repetition of the longer term.

Current-carrying part. The term means a conducting part intended to be connected in an electric circuit to a source of voltage. Non-current-carrying parts are those not intended to be so connected.

Dead (deenergized). The term means free from any electrical connection to a source of potential difference and from electrical charges: Not having a potential difference from that of earth.
NOTE: The term is used only with reference to current-carrying parts which are sometimes alive (energized).
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