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100%; box-sizing: border-box; font-weight: 700; border-width: 0px; border-style: initial; border-color: initial; font-style: inherit; font-variant: inherit; font-stretch: inherit; line-height: inherit; vertical-align: baseline; font-family: 宋体, SimSun; overflow-wrap: break-word !important;">不过由于其他原因造成的零线短开，那就不行了，当你触摸已经断开的一点，火线中的负载虽然没有形成闭合回路，你人体触摸到火线经过的零线，相当于人体串联在线路中，也可以形成闭合回路的，任何一个超过人体感知电流或者触电电流时，是特别危险的。</span></span></strong></p><p style="margin-top: 20px; margin-bottom: 20px; padding: 0px; outline: 0px; max-width: 100%; box-sizing: border-box; overflow-wrap: break-word; clear: both; min-height: 1em; border-width: 0px; border-style: initial; border-color: initial; font-variant-numeric: inherit; font-variant-east-asian: inherit; font-stretch: inherit; font-size: 18px; line-height: inherit; font-family: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "WenQuanYi Micro Hei", "Helvetica Neue", Arial, sans-serif; vertical-align: baseline; color: rgb(34, 34, 34); text-align: justify; white-space: normal; background-color: rgb(255, 255, 255);"><strong><span style="font-size: 14px;"><span style="margin: 0px; padding: 0px; outline: 0px; max-width: 100%; box-sizing: border-box; font-weight: 700; border-width: 0px; border-style: initial; border-color: initial; font-style: inherit; font-variant: inherit; font-stretch: inherit; font-size: inherit; line-height: inherit; vertical-align: baseline; font-family: 宋体, SimSun; overflow-wrap: break-word !important;">♦三相四线电路中，对负载计算时须***以“向量图来表示”，根据负载在交流电流中的接点电流定律和回路电压定律进行计算。</span></span></strong></p><p style="margin-top: 20px; margin-bottom: 20px; padding: 0px; outline: 0px; max-width: 100%; box-sizing: border-box; overflow-wrap: break-word; clear: both; min-height: 1em; border-width: 0px; border-style: initial; border-color: initial; font-variant-numeric: inherit; font-variant-east-asian: inherit; font-stretch: inherit; font-size: 18px; line-height: inherit; font-family: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "WenQuanYi Micro Hei", "Helvetica Neue", Arial, sans-serif; vertical-align: baseline; color: rgb(34, 34, 34); text-align: justify; white-space: normal; background-color: rgb(255, 255, 255);"><strong><span style="font-size: 14px;"><span style="font-size: 14px; font-family: 宋体, SimSun;"><span style="margin: 0px; padding: 0px; outline: 0px; max-width: 100%; box-sizing: border-box; font-weight: 700; border-width: 0px; border-style: initial; border-color: initial; font-style: inherit; font-variant: inherit; font-stretch: inherit; font-size: inherit; line-height: inherit; font-family: inherit; vertical-align: baseline; overflow-wrap: break-word !important;">在交流电路中，电压和电流都是正弦交变量，因而在应用节点电流定律和回路电压定律时，须***以向量来表 示。这样，节点电流定律就可表述为:在正弦交流电路中，流入节点电流的向量和等于零。用公式表达为 Σi=0，并规定流入节点的电流取正号，流出节点的电流取负号。回路电压定律可表述为:在正弦交流电路任一回路中，各电源电动势的向量和等于各元件上电压降的向量和。用公式表达为ΣE=ΣU，并规定与选定的绕行方向相同的电源电动势和电压降取正号,反之取负号。</span><span style="margin: 0px; padding: 0px; outline: 0px; max-width: 100%; color: rgb(51, 51, 51); font-family: mp-quote, -apple-system-font, BlinkMacSystemFont, "Helvetica Neue", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei UI", "Microsoft YaHei", Arial, sans-serif; font-size: 17px; box-sizing: border-box !important; overflow-wrap: break-word !important;"></span></span></span></strong></p><p style="margin-top: 20px; margin-bottom: 20px; padding: 0px; outline: 0px; max-width: 100%; box-sizing: border-box; overflow-wrap: break-word; clear: both; min-height: 1em; border-width: 0px; border-style: initial; border-color: initial; font-variant-numeric: inherit; font-variant-east-asian: inherit; font-stretch: inherit; font-size: 18px; line-height: inherit; font-family: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "WenQuanYi Micro Hei", "Helvetica Neue", Arial, sans-serif; vertical-align: baseline; color: rgb(34, 34, 34); text-align: justify; white-space: normal; background-color: rgb(255, 255, 255);"><strong><span style="font-size: 14px;"><span style="margin: 0px; padding: 0px; outline: 0px; max-width: 100%; box-sizing: border-box; font-weight: 700; border-width: 0px; border-style: initial; border-color: initial; font-style: inherit; font-variant: inherit; font-stretch: inherit; font-size: inherit; line-height: inherit; vertical-align: baseline; font-family: 宋体, SimSun; overflow-wrap: break-word !important;">为了说明问题，下面本人举例: 有一台三相四线连接的大功率电阻炉，各相电热丝的电阻值为Ra=Rb=4Ω，Rc=2Ω，电源电压为380V，接有零线N。试问这一台电阻炉中的相电流、线电流和零线电流各是多少？</span></span></strong></p><p style="margin-top: 20px; margin-bottom: 20px; padding: 0px; outline: 0px; max-width: 100%; box-sizing: border-box; overflow-wrap: break-word; clear: both; min-height: 1em; border-width: 0px; border-style: initial; border-color: initial; font-variant-numeric: inherit; font-variant-east-asian: inherit; font-stretch: inherit; font-size: 18px; line-height: inherit; font-family: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "WenQuanYi Micro Hei", "Helvetica Neue", Arial, sans-serif; vertical-align: baseline; color: rgb(34, 34, 34); text-align: justify; white-space: normal; background-color: rgb(255, 255, 255);"><strong><span style="font-size: 14px;"><span style="margin: 0px; padding: 0px; outline: 0px; max-width: 100%; box-sizing: border-box; font-weight: 700; border-width: 0px; border-style: initial; border-color: initial; font-style: inherit; font-variant: inherit; font-stretch: inherit; font-size: inherit; line-height: inherit; vertical-align: baseline; font-family: 宋体, SimSun; overflow-wrap: break-word !important;">根据电工学中相电压与线电压关系为Uxg=Uxn/√3=380/1.732=220V式中的Uxg表示相电压，Uxn表示线电压。</span></span></strong></p><p style="margin-top: 20px; margin-bottom: 20px; padding: 0px; outline: 0px; max-width: 100%; box-sizing: border-box; overflow-wrap: break-word; clear: both; min-height: 1em; border-width: 0px; border-style: initial; border-color: initial; font-variant-numeric: inherit; font-variant-east-asian: inherit; font-stretch: inherit; font-size: 18px; line-height: inherit; font-family: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "WenQuanYi Micro Hei", "Helvetica Neue", Arial, sans-serif; vertical-align: baseline; color: rgb(34, 34, 34); text-align: justify; white-space: normal; background-color: rgb(255, 255, 255);"><strong><span style="font-size: 14px;"><span style="margin: 0px; padding: 0px; outline: 0px; max-width: 100%; box-sizing: border-box; font-weight: 700; border-width: 0px; border-style: initial; border-color: initial; font-style: inherit; font-variant: inherit; font-stretch: inherit; font-size: inherit; line-height: inherit; vertical-align: baseline; font-family: 宋体, SimSun; overflow-wrap: break-word !important;">再根据欧姆定律计算Ia=Ib=Uxg/Ra=220/4=55A；</span></span></strong></p><p style="margin-top: 20px; margin-bottom: 20px; padding: 0px; outline: 0px; max-width: 100%; box-sizing: border-box; overflow-wrap: break-word; clear: both; min-height: 1em; border-width: 0px; border-style: initial; border-color: initial; font-variant-numeric: inherit; font-variant-east-asian: inherit; font-stretch: inherit; font-size: 18px; line-height: inherit; font-family: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "WenQuanYi Micro Hei", "Helvetica Neue", Arial, sans-serif; vertical-align: baseline; color: rgb(34, 34, 34); white-space: normal; background-color: rgb(255, 255, 255);"><strong><span style="font-size: 14px;"><span style="margin: 0px; padding: 0px; outline: 0px; max-width: 100%; box-sizing: border-box; font-weight: 700; border-width: 0px; border-style: initial; border-color: initial; font-style: inherit; font-variant: inherit; font-stretch: inherit; font-size: inherit; line-height: inherit; vertical-align: baseline; font-family: 宋体, SimSun; overflow-wrap: break-word !important;">iC=Uxg/2=110A；</span></span></strong></p><p style="margin-top: 20px; margin-bottom: 20px; padding: 0px; outline: 0px; max-width: 100%; box-sizing: border-box; overflow-wrap: break-word; clear: both; min-height: 1em; border-width: 0px; border-style: initial; border-color: initial; font-variant-numeric: inherit; font-variant-east-asian: inherit; font-stretch: inherit; font-size: 18px; line-height: inherit; font-family: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "WenQuanYi Micro Hei", "Helvetica Neue", Arial, sans-serif; vertical-align: baseline; color: rgb(34, 34, 34); text-align: justify; white-space: normal; background-color: rgb(255, 255, 255);"><strong><span style="font-size: 14px;"><span style="margin: 0px; padding: 0px; outline: 0px; max-width: 100%; box-sizing: border-box; font-weight: 700; border-width: 0px; border-style: initial; border-color: initial; font-style: inherit; font-variant: inherit; font-stretch: inherit; font-size: inherit; line-height: inherit; vertical-align: baseline; font-family: 宋体, SimSun; overflow-wrap: break-word !important;">根据星形接法时，各相电流与相应相电压是同相，在星形接法连接中，线电流等于相电流。所以线电流为: Ia=Ib=55A，Ic=110A。</span></span></strong></p><p style="margin-top: 20px; margin-bottom: 20px; padding: 0px; outline: 0px; max-width: 100%; box-sizing: border-box; overflow-wrap: break-word; clear: both; min-height: 1em; border-width: 0px; border-style: initial; border-color: initial; font-variant-numeric: inherit; font-variant-east-asian: inherit; font-stretch: inherit; font-size: 18px; line-height: inherit; font-family: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "WenQuanYi Micro Hei", "Helvetica Neue", Arial, sans-serif; vertical-align: baseline; color: rgb(34, 34, 34); text-align: justify; white-space: normal; background-color: rgb(255, 255, 255);"><strong><span style="font-size: 14px;"><span style="margin: 0px; padding: 0px; outline: 0px; max-width: 100%; box-sizing: border-box; font-weight: 700; border-width: 0px; border-style: initial; border-color: initial; font-style: inherit; font-variant: inherit; font-stretch: inherit; font-size: inherit; line-height: inherit; vertical-align: baseline; font-family: 宋体, SimSun; overflow-wrap: break-word !important;">此时零线的电流计算公式等于各相电流的向量和，即Io=Ia+Ib+Ic。计算零线电流Io时，可首先求Ia与Ib的向量和，见上图向量图。由向量图可得:Ia,+Ib=55A，并且与Ic是反方向的，因此，Io=Ic+55=110-55=55A，并且此时零线电流Io与Uc是同相。须***说明的是，零线的电流虽然有，但它通过导线将零线电流与变压器输出的中性点到一起了，参加了继续工作的机会。也就是说只有完全明确了它的计算方法须***采用向量图的基本概念，才能够进行计算。</span></span></strong></p><p style="margin-top: 0px; margin-bottom: 0px; padding: 0px; outline: 0px; max-width: 100%; clear: both; min-height: 1em; box-sizing: border-box !important; overflow-wrap: break-word !important;"><br/></p><p><br/></p><div class="clear"></div> <div class="blank30"></div> <div class="blank30"></div> <!-- 投票 --> <script src="/index.php?case=vote&act=view&aid=771"></script> <div class="view_n"> 浏览： <script src="/index.php?case=archive&act=view_js&aid=771"></script></div> <div class="blank30"></div> <!-- 上下页开始 --> <div id="page"> <strong>上一篇：</strong><a href="/index.php?case=archive&act=show&aid=762">线缆产品的绝缘结构总论——探讨绝缘厚度的确定原则</a> <div class="blank10"></div> <strong>下一篇：</strong><a 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