<*n lang="EN-US">    <*n style="font-family:宋体;mso-ascii-font-family:Calibri;mso-ascii-theme-font:minor-latin; mso-fareast-font-family:宋体;mso-fareast-theme-font:minor-fareast;mso-hansi-font-family: Calibri;mso-hansi-theme-font:minor-latin">它是高压电路中****简单的一种保护电器。广泛用于高压配电装置中，作为线路、变压器和电压互感器等电气设备的保护。

<*n lang="EN-US">    <*n style="font-family:宋体;mso-ascii-font-family:Calibri;mso-ascii-theme-font:minor-latin; mso-fareast-font-family:宋体;mso-fareast-theme-font:minor-fareast;mso-hansi-font-family: Calibri;mso-hansi-theme-font:minor-latin">高压熔断器按使用环境条件分为户内和户外<*n lang="EN-US">;<*n style="font-family:宋体;mso-ascii-font-family:Calibri; mso-ascii-theme-font:minor-latin;mso-fareast-font-family:宋体;mso-fareast-theme-font: minor-fareast;mso-hansi-font-family:Calibri;mso-hansi-theme-font:minor-latin">按灭弧方式分为产气管式熔断器、充填石英砂型的熔断器等。

<*n lang="EN-US">    I.<*n style="font-family:宋体;mso-ascii-font-family:Calibri; mso-ascii-theme-font:minor-latin;mso-fareast-font-family:宋体;mso-fareast-theme-font: minor-fareast;mso-hansi-font-family:Calibri;mso-hansi-theme-font:minor-latin">户内高压熔断器，分别为充填石英砂型的户内高压熔断器的外形图与结构图，这类熔断器有<*n lang="EN-US">RN1<*n style="font-family:宋体;mso-ascii-font-family:Calibri; mso-ascii-theme-font:minor-latin;mso-fareast-font-family:宋体;mso-fareast-theme-font: minor-fareast;mso-hansi-font-family:Calibri;mso-hansi-theme-font:minor-latin">型和<*n lang="EN-US">RN2<*n style="font-family:宋体;mso-ascii-font-family:Calibri; mso-ascii-theme-font:minor-latin;mso-fareast-font-family:宋体;mso-fareast-theme-font: minor-fareast;mso-hansi-font-family:Calibri;mso-hansi-theme-font:minor-latin">型两种。现以<*n lang="EN-US">RN1<*n style="font-family:宋体;mso-ascii-font-family:Calibri; mso-ascii-theme-font:minor-latin;mso-fareast-font-family:宋体;mso-fareast-theme-font: minor-fareast;mso-hansi-font-family:Calibri;mso-hansi-theme-font:minor-latin">型为例说明其原理。

<*n lang="EN-US">    RN1<*n style="font-family:宋体;mso-ascii-font-family:Calibri; mso-ascii-theme-font:minor-latin;mso-fareast-font-family:宋体;mso-fareast-theme-font: minor-fareast;mso-hansi-font-family:Calibri;mso-hansi-theme-font:minor-latin">型熔断器主要是由熔管和熔件组成。根据额定电流的大小，凡在<*n lang="EN-US">7.5A<*n style="font-family:宋体;mso-ascii-font-family:Calibri; mso-ascii-theme-font:minor-latin;mso-fareast-font-family:宋体;mso-fareast-theme-font: minor-fareast;mso-hansi-font-family:Calibri;mso-hansi-theme-font:minor-latin">以下时<*n lang="EN-US">(<*n style="font-family:宋体;mso-ascii-font-family:Calibri; mso-ascii-theme-font:minor-latin;mso-fareast-font-family:宋体;mso-fareast-theme-font: minor-fareast;mso-hansi-font-family:Calibri;mso-hansi-theme-font:minor-latin">包括<*n lang="EN-US">7.5A),<*n style="font-family:宋体;mso-ascii-font-family:Calibri; mso-ascii-theme-font:minor-latin;mso-fareast-font-family:宋体;mso-fareast-theme-font: minor-fareast;mso-hansi-font-family:Calibri;mso-hansi-theme-font:minor-latin">每相熔件可由一根或几根并联<*n lang="EN-US">(<*n style="font-family:宋体;mso-ascii-font-family:Calibri; mso-ascii-theme-font:minor-latin;mso-fareast-font-family:宋体;mso-fareast-theme-font: minor-fareast;mso-hansi-font-family:Calibri;mso-hansi-theme-font:minor-latin">一般有一、二、四根三种<*n lang="EN-US">)<*n style="font-family:宋体;mso-ascii-font-family:Calibri; mso-ascii-theme-font:minor-latin;mso-fareast-font-family:宋体;mso-fareast-theme-font: minor-fareast;mso-hansi-font-family:Calibri;mso-hansi-theme-font:minor-latin">的等直径的镀银铜丝<*n lang="EN-US">5<*n style="font-family:宋体;mso-ascii-font-family:Calibri; mso-ascii-theme-font:minor-latin;mso-fareast-font-family:宋体;mso-fareast-theme-font: minor-fareast;mso-hansi-font-family:Calibri;mso-hansi-theme-font:minor-latin">绕在瓷芯<*n lang="EN-US">4<*n style="font-family:宋体;mso-ascii-font-family:Calibri; mso-ascii-theme-font:minor-latin;mso-fareast-font-family:宋体;mso-fareast-theme-font: minor-fareast;mso-hansi-font-family:Calibri;mso-hansi-theme-font:minor-latin">上，从而保持熔件在熔管内的正确位置。同时，在熔件中间焊一小锡球<*n lang="EN-US">6,<*n style="font-family:宋体;mso-ascii-font-family:Calibri; mso-ascii-theme-font:minor-latin;mso-fareast-font-family:宋体;mso-fareast-theme-font: minor-fareast;mso-hansi-font-family:Calibri;mso-hansi-theme-font:minor-latin">熔件放入熔管内，填满石英砂<*n lang="EN-US">7<*n style="font-family:宋体;mso-ascii-font-family:Calibri; mso-ascii-theme-font:minor-latin;mso-fareast-font-family:宋体;mso-fareast-theme-font: minor-fareast;mso-hansi-font-family:Calibri;mso-hansi-theme-font:minor-latin">。在瓷熔管<*n lang="EN-US">I<*n style="font-family:宋体;mso-ascii-font-family:Calibri; mso-ascii-theme-font:minor-latin;mso-fareast-font-family:宋体;mso-fareast-theme-font: minor-fareast;mso-hansi-font-family:Calibri;mso-hansi-theme-font:minor-latin">的两端套有铜环<*n lang="EN-US">2<*n style="font-family:宋体;mso-ascii-font-family:Calibri; mso-ascii-theme-font:minor-latin;mso-fareast-font-family:宋体;mso-fareast-theme-font: minor-fareast;mso-hansi-font-family:Calibri;mso-hansi-theme-font:minor-latin">，然后在两端焊上顶盖<*n lang="EN-US">3<*n style="font-family:宋体;mso-ascii-font-family:Calibri; mso-ascii-theme-font:minor-latin;mso-fareast-font-family:宋体;mso-fareast-theme-font: minor-fareast;mso-hansi-font-family:Calibri;mso-hansi-theme-font:minor-latin">，使瓷熔管密封。当额定电流大于<*n lang="EN-US">7.5A<*n style="font-family:宋体;mso-ascii-font-family:Calibri; mso-ascii-theme-font:minor-latin;mso-fareast-font-family:宋体;mso-fareast-theme-font: minor-fareast;mso-hansi-font-family:Calibri;mso-hansi-theme-font:minor-latin">时，熔件由两种不同直径的镀银钢丝制成螺旋形，在连接处焊有小锡球<*n lang="EN-US">6<*n style="font-family:宋体;mso-ascii-font-family:Calibri; mso-ascii-theme-font:minor-latin;mso-fareast-font-family:宋体;mso-fareast-theme-font: minor-fareast;mso-hansi-font-family:Calibri;mso-hansi-theme-font:minor-latin">，熔管下端指示器<*n lang="EN-US">9<*n style="font-family:宋体;mso-ascii-font-family:Calibri; mso-ascii-theme-font:minor-latin;mso-fareast-font-family:宋体;mso-fareast-theme-font: minor-fareast;mso-hansi-font-family:Calibri;mso-hansi-theme-font:minor-latin">与熔管内的钢件<*n lang="EN-US">8<*n style="font-family:宋体;mso-ascii-font-family:Calibri; mso-ascii-theme-font:minor-latin;mso-fareast-font-family:宋体;mso-fareast-theme-font: minor-fareast;mso-hansi-font-family:Calibri;mso-hansi-theme-font:minor-latin">相连，构成钢件指示器。

<*n style="font-family:宋体; mso-ascii-font-family:Calibri;mso-ascii-theme-font:minor-latin;mso-fareast-font-family: 宋体;mso-fareast-theme-font:minor-fareast;mso-hansi-font-family:Calibri; mso-hansi-theme-font:minor-latin">工作原理<*n lang="EN-US">:<*n style="font-family:宋体;mso-ascii-font-family:Calibri;mso-ascii-theme-font:minor-latin; mso-fareast-font-family:宋体;mso-fareast-theme-font:minor-fareast;mso-hansi-font-family: Calibri;mso-hansi-theme-font:minor-latin">熔断器串联于电路中，在正常工作时，熔件所通过的负荷电流等于或小于其额定值，各部分的发热不超过长期允许发热溢度，熔件不会熔断。当电路发生短路故障时，通过熔断器的短路电流大大超过额定值，熔件立即熔化和蒸发。电弧在石英砂中燃烧，产生的金属蒸气猛烈地向四处喷溅，渗人到石英砂的缝隙中，与周围的石英砂紧密接触，对电弧的冷却效果好，加强去游离。由于熔断器内的石英砂对电弧有很强的冷却作用，电弧电压梯度<*n lang="EN-US">E<*n style="font-family:宋体;mso-ascii-font-family:Calibri; mso-ascii-theme-font:minor-latin;mso-fareast-font-family:宋体;mso-fareast-theme-font: minor-fareast;mso-hansi-font-family:Calibri;mso-hansi-theme-font:minor-latin">、也比较大，结果，电弧电压<*n lang="EN-US">U<*n style="font-family:宋体;mso-ascii-font-family:Calibri; mso-ascii-theme-font:minor-latin;mso-fareast-font-family:宋体;mso-fareast-theme-font: minor-fareast;mso-hansi-font-family:Calibri;mso-hansi-theme-font:minor-latin">、超过电源电压<*n lang="EN-US">U<*n style="font-family:宋体;mso-ascii-font-family:Calibri; mso-ascii-theme-font:minor-latin;mso-fareast-font-family:宋体;mso-fareast-theme-font: minor-fareast;mso-hansi-font-family:Calibri;mso-hansi-theme-font:minor-latin">，电弧不能维持，电流急剧减小，电流过零时电弧熄灭。在熔件熔化后，电流还未达到****大值之前，立即减小使电弧熄灭，这样的熔断器称为限流熔断器。当熔件熔化后，电流几乎不减小，持续达到****大值，电流****次过零或经几个半周之后电弧熄灭，称为不限流熔断器。

<*n style="font-family:宋体;mso-ascii-font-family:Calibri; mso-ascii-theme-font:minor-latin;mso-fareast-font-family:宋体;mso-fareast-theme-font: minor-fareast;mso-hansi-font-family:Calibri;mso-hansi-theme-font:minor-latin">上海川高电气有限公司就就是****生产<*n lang="EN-US">10KV-40.5KV<*n style="font-family:宋体;mso-ascii-font-family: Calibri;mso-ascii-theme-font:minor-latin;mso-fareast-font-family:宋体;mso-fareast-theme-font: minor-fareast;mso-hansi-font-family:Calibri;mso-hansi-theme-font:minor-latin">系列户内、外高压电器产品：高压负荷开关、<*n lang="EN-US"><*n lang="EN-US" style="font-family:宋体;mso-ascii-font-family:Calibri;mso-ascii-theme-font:minor-latin; mso-fareast-font-family:宋体;mso-fareast-theme-font:minor-fareast;mso-hansi-font-family: Calibri;mso-hansi-theme-font:minor-latin">高压熔断器<*n style="font-family:宋体;mso-ascii-font-family:Calibri;mso-ascii-theme-font:minor-latin; mso-fareast-font-family:宋体;mso-fareast-theme-font:minor-fareast;mso-hansi-font-family: Calibri;mso-hansi-theme-font:minor-latin">，高压断路器、隔离开关、接地开关、电缆分支箱互感器、<*n lang="EN-US">HXGN17-12<*n style="font-family:宋体;mso-ascii-font-family: Calibri;mso-ascii-theme-font:minor-latin;mso-fareast-font-family:宋体;mso-fareast-theme-font: minor-fareast;mso-hansi-font-family:Calibri;mso-hansi-theme-font:minor-latin">系列高压环网柜，<*n lang="EN-US">DFW-12<*n style="font-family:宋体;mso-ascii-font-family:Calibri; mso-ascii-theme-font:minor-latin;mso-fareast-font-family:宋体;mso-fareast-theme-font: minor-fareast;mso-hansi-font-family:Calibri;mso-hansi-theme-font:minor-latin">高压电缆分支箱及箱式开闭所。现已开发并生产<*n lang="EN-US">24KV<*n style="font-family:宋体;mso-ascii-font-family:Calibri; mso-ascii-theme-font:minor-latin;mso-fareast-font-family:宋体;mso-fareast-theme-font: minor-fareast;mso-hansi-font-family:Calibri;mso-hansi-theme-font:minor-latin">****环网柜、充气柜、中置柜，箱变等系列产品。****组装施耐德<*n lang="EN-US">SC6<*n style="font-family:宋体;mso-ascii-font-family:Calibri; mso-ascii-theme-font:minor-latin;mso-fareast-font-family:宋体;mso-fareast-theme-font: minor-fareast;mso-hansi-font-family:Calibri;mso-hansi-theme-font:minor-latin">系列负荷开关柜，<*n lang="EN-US">A*<*n style="font-family:宋体;mso-ascii-font-family:Calibri; mso-ascii-theme-font:minor-latin;mso-fareast-font-family:宋体;mso-fareast-theme-font: minor-fareast;mso-hansi-font-family:Calibri;mso-hansi-theme-font:minor-latin">系列负荷开关柜。公司产品齐全，所生产产品均通过<*n lang="EN-US">ISO9001<*n style="font-family:宋体;mso-ascii-font-family: Calibri;mso-ascii-theme-font:minor-latin;mso-fareast-font-family:宋体;mso-fareast-theme-font: minor-fareast;mso-hansi-font-family:Calibri;mso-hansi-theme-font:minor-latin">国际质量体系认证，符合相关国内，国际认证标准。高压熔断器，电缆分接箱等产品质量可靠，性能稳定并在电网上安全运行，倍受用户好评。

<*n style="font-family:宋体;mso-ascii-font-family:Calibri;mso-ascii-theme-font:minor-latin; mso-fareast-font-family:宋体;mso-fareast-theme-font:minor-fareast;mso-hansi-font-family: Calibri;mso-hansi-theme-font:minor-latin">相关性产品推荐：<*n lang="EN-US">http://www.shchuangao*/chanpin/rongduanqi/

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