| | | | | 它给我的印象是比较占地方,特别是20W以下的电源,最小要用到10D(INTERTEK做认证时被提出),目前我都是用保险电阻来解决SURGE的问题 |
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| | | | | | | 如果我的卖压敏的业务员,用这个帮你选型,你说是不是高手 |
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| | | | | 楼主的方法有所不妥,
1)这一张压敏电阻选型表实属多余。压敏电阻的电压选取非常简单,按2,2倍的交流电压即可,即2.2*VAC
2)作为电源输入端防防浪涌(浪涌包括了雷击),压敏电阻应选择有UL1449认证的Type3, 直径为10D或以上的压敏电阻,其余的都是浮云。
因此简单的记住三点即可: 2.2VAC,TYPE3,10D或以上
以下供参考:
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| | | | | | | AC265V输入的,请问你怎么选?TYPE3是什么 |
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| | | | | | | | | 265*2.2=583,往上靠,选10621
Type3是什么?见下文。
UL1449将SPD(surge protective Device)分成4种类型,分别为:
Type1 – Permanently connectedSPDs intended for installation between the secondary of the service transformerand the line side of the service equipment over current device, as well as
the load side, including watt-hour meter socket enclosures andintended to be installed without
an external over current protective device..
Type 2 – Permanently connected SPDs intended forinstallation on the load side of the service
equipment over current device; including SPDs located at the branchpanel.
Type 3 – Point of utilization SPDs, installed at aminimum conductor length of 10 meters (30
feet) from the electrical service panel to the point ofutilization, for example cord connected,
direct plug-in, receptacle type and SPDs installed at theutilization equipment being protected.
See marking in 64.2. Thedistance (10 meters) is exclusive of conductors provided with or used to attach SPDs.
Type 4 – Component SPDs, including discrete componentsas well as component assemblies.
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| | | | | | | | | | | | | 不用谢,只是摘抄标准。
貌似4种类型都写得很清楚其实是比较抽象的。 |
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| | | | | | | | | | | 照这么算,220VAC*2.2=484,取10D561? |
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| | | | | | | | | | | 这里还需说明一下,23楼中如果264V是240V的标称电压加上10%的波动后的电压则应按240*2.2来算。 |
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| | | | | | | | | | | 这里type1 - Type4光看字面很难理解,举个例子比较能说明问题
Type1 - 用于进户线到总配电板上
Type2 - 用于分配电板上
Type3 - 用于拖线板上,我们可用于开关电源上
Type4 - 用于器件的保护上,比如并联在可控硅上用于保护可控硅 |
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