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标题: 50312中的电力电缆和対绞电缆的距离问题 [打印本页]

作者: 平禅心 时间: 2010-8-9 22:20
标题: 50312中的电力电缆和対绞电缆的距离问题
<p><font size="3">在弱电项目实施中，总是有人问强电和弱电的距离问题！<span style="FONT-FAMILY: 宋体; mso-ascii-font-family: Verdana; mso-hansi-font-family: Verdana">看来大家都没搞清楚这个问题啊！</span></font></p>
<p><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: Verdana; mso-hansi-font-family: Verdana"><font size="3"></font></span> </p>
<p><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: Verdana; mso-hansi-font-family: Verdana"><font size="3">那么380V电和220V电有什么区别呢？</font></span></p>
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<p><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: Verdana; mso-hansi-font-family: Verdana"><font size="3">我国的电力系统传输一般采用三相四线制，就是A、B、C三相加上N，N是地。380V指的是线电压，即A相和B相，B相和C相，C相和A相之间都是 380V。而220V指的是相电压，即A和N，B和N，C和N之间是220V.根据向量图分析，线电压是相电压的根号3倍。220乘以根号3等于380。 380V属于动力电，因为电动机等用电设备需要对称的三相电源。普通照明用的是任意一相和地。A、B、C中任意一相就是俗称的‘火线’，而N就是俗称的 ‘零线’。你要从380里取220，只要任取一相做火线，取N做零线，他们之间就是220V.</font></span></p>
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<p><font size="3"><span lang="EN-US">50312-2007</span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: Verdana; mso-hansi-font-family: Verdana">规范只说明了380V的电力电缆和对绞电缆的距离，未说明220V电力电缆和对绞电缆的距离。</span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: Verdana; mso-hansi-font-family: Verdana">办公室的插座什么的都是</span><span lang="EN-US">220V</span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: Verdana; mso-hansi-font-family: Verdana">的，这样根据2者的干扰强度的不同，在这种情况下，和强电的面板、线管等距离保持</span><span lang="EN-US">10</span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: Verdana; mso-hansi-font-family: Verdana">、</span><span lang="EN-US">15</span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: Verdana; mso-hansi-font-family: Verdana">、</span><span lang="EN-US">20cm</span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: Verdana; mso-hansi-font-family: Verdana">都可以的，而且对绞电缆一般都是穿</span><span lang="EN-US">PVC</span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: Verdana; mso-hansi-font-family: Verdana">管或KBG管墙内暗敷的，也能起到一定的屏蔽作用。</span></font></p>
<p><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: Verdana; mso-hansi-font-family: Verdana"><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: Verdana; mso-hansi-font-family: Verdana"><font size="3"></font></span></span> </p>
<p><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: Verdana; mso-hansi-font-family: Verdana"><font size="3">你说呢？</font></span></p>
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<p><span lang="EN-US">                                                                                       920220816</span></p>

作者: lyw588xyz 时间: 2010-8-11 11:27
<p>分析的不错，顶一下。</p>

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