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 <title><![CDATA[电控柜主空开选择标准怎么计算？]]></title>
 <link><![CDATA[http://www.ymmfa.com/read-gktid-1652488.html]]></link>
 <description><![CDATA[Latest 50 replies of 电控柜主空开选择标准怎么计算？]]></description>
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 <title><![CDATA[工控人家园]]></title>
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 <description><![CDATA[三相交流电
P=1.732*U*I*cosφ*η&nbsp;&nbsp;
P：功率
U：电压380V
&nbsp;&nbsp;I：电流
cosφ：电机功率因数取0.8
η：电机机械效率取0.95
45000＝1.732*380*I*0.8*0.95&nbsp;&nbsp;计算得额定电流约90A
轻载125A，重载直启160A]]></description>
 <link><![CDATA[http://www.ymmfa.com/read-gktid-1652488#1986390.html]]></link>
 <author><![CDATA[神州孟]]></author>
 <category><![CDATA[综合讨论]]></category>
 <pubdate><![CDATA[Mon, 16 Jul 2018 06:22:33 +0000]]></pubdate>
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 <title><![CDATA[]]></title>
 <description><![CDATA[是的 需要确认负载类型、功率因数]]></description>
 <link><![CDATA[http://www.ymmfa.com/read-gktid-1652488#1986373.html]]></link>
 <author><![CDATA[daxin365]]></author>
 <category><![CDATA[综合讨论]]></category>
 <pubdate><![CDATA[Mon, 16 Jul 2018 04:42:06 +0000]]></pubdate>
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 <title><![CDATA[]]></title>
 <description><![CDATA[8正解]]></description>
 <link><![CDATA[http://www.ymmfa.com/read-gktid-1652488#1986366.html]]></link>
 <author><![CDATA[工控小王子]]></author>
 <category><![CDATA[综合讨论]]></category>
 <pubdate><![CDATA[Mon, 16 Jul 2018 04:24:55 +0000]]></pubdate>
</item>
<item>
 <title><![CDATA[]]></title>
 <description><![CDATA[路过学习了]]></description>
 <link><![CDATA[http://www.ymmfa.com/read-gktid-1652488#1986336.html]]></link>
 <author><![CDATA[学习无限]]></author>
 <category><![CDATA[综合讨论]]></category>
 <pubdate><![CDATA[Mon, 16 Jul 2018 02:49:01 +0000]]></pubdate>
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 <title><![CDATA[]]></title>
 <description><![CDATA[需要确认负载类型、功率因数]]></description>
 <link><![CDATA[http://www.ymmfa.com/read-gktid-1652488#1985895.html]]></link>
 <author><![CDATA[神州孟]]></author>
 <category><![CDATA[综合讨论]]></category>
 <pubdate><![CDATA[Fri, 13 Jul 2018 03:03:06 +0000]]></pubdate>
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 <title><![CDATA[]]></title>
 <description><![CDATA[总电流*1.3&nbsp;&nbsp;我们是这么算的]]></description>
 <link><![CDATA[http://www.ymmfa.com/read-gktid-1652488#1985855.html]]></link>
 <author><![CDATA[shenyuan]]></author>
 <category><![CDATA[综合讨论]]></category>
 <pubdate><![CDATA[Fri, 13 Jul 2018 01:26:51 +0000]]></pubdate>
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 <title><![CDATA[]]></title>
 <description><![CDATA[学习了[s:21]]]></description>
 <link><![CDATA[http://www.ymmfa.com/read-gktid-1652488#1985848.html]]></link>
 <author><![CDATA[reefer_001]]></author>
 <category><![CDATA[综合讨论]]></category>
 <pubdate><![CDATA[Fri, 13 Jul 2018 01:09:04 +0000]]></pubdate>
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 <title><![CDATA[]]></title>
 <description><![CDATA[学习了]]></description>
 <link><![CDATA[http://www.ymmfa.com/read-gktid-1652488#1984843.html]]></link>
 <author><![CDATA[工控小石]]></author>
 <category><![CDATA[综合讨论]]></category>
 <pubdate><![CDATA[Mon, 09 Jul 2018 01:07:31 +0000]]></pubdate>
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 <title><![CDATA[]]></title>
 <description><![CDATA[有没有这么复杂啊，我们用100A的总开关都没事，还有380的电机，加热管]]></description>
 <link><![CDATA[http://www.ymmfa.com/read-gktid-1652488#1984813.html]]></link>
 <author><![CDATA[zsdsun]]></author>
 <category><![CDATA[综合讨论]]></category>
 <pubdate><![CDATA[Sun, 08 Jul 2018 14:50:53 +0000]]></pubdate>
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<item>
 <title><![CDATA[]]></title>
 <description><![CDATA[学习了]]></description>
 <link><![CDATA[http://www.ymmfa.com/read-gktid-1652488#1984335.html]]></link>
 <author><![CDATA[风中的爱]]></author>
 <category><![CDATA[综合讨论]]></category>
 <pubdate><![CDATA[Fri, 06 Jul 2018 08:05:48 +0000]]></pubdate>
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 <title><![CDATA[]]></title>
 <description><![CDATA[首先你要考虑的不是空开的电流，是要用多大的电缆，根据电缆的长度计算短路电流，再根据电缆最远处的短路电流选择相对应瞬时脱扣电流的断路器，还有断路器要满足最大短路电流的分断能力，所以同样是160A的断路器，因为分断能力不一样，体积也不一样，散热系数也不一样，如果以上都不考虑,塑壳式空开电流=1.7*负载额定电流 ..]]></description>
 <link><![CDATA[http://www.ymmfa.com/read-gktid-1652488#1984277.html]]></link>
 <author><![CDATA[wul2.4g]]></author>
 <category><![CDATA[综合讨论]]></category>
 <pubdate><![CDATA[Fri, 06 Jul 2018 05:29:21 +0000]]></pubdate>
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 <title><![CDATA[]]></title>
 <description><![CDATA[[s:21]]]></description>
 <link><![CDATA[http://www.ymmfa.com/read-gktid-1652488#1984238.html]]></link>
 <author><![CDATA[fenoicq]]></author>
 <category><![CDATA[综合讨论]]></category>
 <pubdate><![CDATA[Fri, 06 Jul 2018 03:23:45 +0000]]></pubdate>
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 <title><![CDATA[]]></title>
 <description><![CDATA[如果全是3相380V的电机的话，算出来总电流是90A没错，但如果里面有3相380V电加热的话，加热管的电流要按功率×1.5算，如果有单相220V的负载的话，最好把几个单相负载尽量平均分到3相里，然后分配完之后单相最大功率的算单相电流（一般是按功率×4.5计算），然后再把所有的电流加在一起算总功率。如果单相负载平均到各相之 ..]]></description>
 <link><![CDATA[http://www.ymmfa.com/read-gktid-1652488#1983871.html]]></link>
 <author><![CDATA[michael.guan]]></author>
 <category><![CDATA[综合讨论]]></category>
 <pubdate><![CDATA[Thu, 05 Jul 2018 00:46:13 +0000]]></pubdate>
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 <title><![CDATA[]]></title>
 <description><![CDATA[什么负载？离开负载类型没法确定。]]></description>
 <link><![CDATA[http://www.ymmfa.com/read-gktid-1652488#1983847.html]]></link>
 <author><![CDATA[lvpretend]]></author>
 <category><![CDATA[综合讨论]]></category>
 <pubdate><![CDATA[Wed, 04 Jul 2018 14:31:58 +0000]]></pubdate>
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 <title><![CDATA[]]></title>
 <description><![CDATA[根据P=1.732*U*I*cosφ*η&nbsp;&nbsp;
 代入式：45000＝1.732*380*I*0.8*0.95&nbsp;&nbsp;计算得电机工作电流约90A
P：电机功率
U：供电电压取380V
&nbsp;&nbsp;I：电机电流
cosφ：电机功率因数取0.8
η：电机机械效率取0.95]]></description>
 <link><![CDATA[http://www.ymmfa.com/read-gktid-1652488#1983819.html]]></link>
 <author><![CDATA[草原牧人]]></author>
 <category><![CDATA[综合讨论]]></category>
 <pubdate><![CDATA[Wed, 04 Jul 2018 12:53:10 +0000]]></pubdate>
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 <title><![CDATA[]]></title>
 <description><![CDATA[125不小了吧]]></description>
 <link><![CDATA[http://www.ymmfa.com/read-gktid-1652488#1983798.html]]></link>
 <author><![CDATA[凌晨0.0]]></author>
 <category><![CDATA[综合讨论]]></category>
 <pubdate><![CDATA[Wed, 04 Jul 2018 11:22:52 +0000]]></pubdate>
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<item>
 <title><![CDATA[]]></title>
 <description><![CDATA[90A是对的]]></description>
 <link><![CDATA[http://www.ymmfa.com/read-gktid-1652488#1983784.html]]></link>
 <author><![CDATA[cjm1234]]></author>
 <category><![CDATA[综合讨论]]></category>
 <pubdate><![CDATA[Wed, 04 Jul 2018 09:22:29 +0000]]></pubdate>
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<item>
 <title><![CDATA[]]></title>
 <description><![CDATA[90A怎么算的？
感觉算错了啊 ！]]></description>
 <link><![CDATA[http://www.ymmfa.com/read-gktid-1652488#1983779.html]]></link>
 <author><![CDATA[一二三四五六]]></author>
 <category><![CDATA[综合讨论]]></category>
 <pubdate><![CDATA[Wed, 04 Jul 2018 09:15:40 +0000]]></pubdate>
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 <title><![CDATA[]]></title>
 <description><![CDATA[45KW的负载，电流怎么算，是不是功率除以电压啊 [s:28]]]></description>
 <link><![CDATA[http://www.ymmfa.com/read-gktid-1652488#1983768.html]]></link>
 <author><![CDATA[大吉大利]]></author>
 <category><![CDATA[综合讨论]]></category>
 <pubdate><![CDATA[Wed, 04 Jul 2018 08:50:29 +0000]]></pubdate>
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 <title><![CDATA[]]></title>
 <description><![CDATA[主NFB = 最大NFB*1.25+其他NFB]]></description>
 <link><![CDATA[http://www.ymmfa.com/read-gktid-1652488#1983761.html]]></link>
 <author><![CDATA[john42tw]]></author>
 <category><![CDATA[综合讨论]]></category>
 <pubdate><![CDATA[Wed, 04 Jul 2018 08:29:25 +0000]]></pubdate>
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