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class="cur">新闻中心</li> <li id='leftMenu_101001'><a href='/qyxw/'>企业新闻</a></li> <li id='leftMenu_101001'><a href='/hydt/'>行业动态</a></li> <li id='leftMenu_101001'><a href='/cpzs/'>产品知识</a></li> <li id='leftMenu_101001'><a href='/zxyf/'>最新研发</a></li> </ul> <span><a href="/">首页</a>>><a href="/xwzx/">新闻中心</a>>><a href="/cpzs/">产品知识</a></span> </div> <div id="1zlx7hpjjv5" class="content"> <div id="1zlx7hpjjv5" class="sub_left"> <h1 class="newstit">干式变压器励磁涌流影响的?；ふ?/h1> <div class="1zlx7hpjjv5" id="Context_news"> <div class="1zlx7hpjjv5" id="jiathis"> <div id="1zlx7hpjjv5" class="left">  <div class="1zlx7hpjjv5" id="bdshare" class="bdshare_t bds_tools get-codes-bdshare"> <span id="1zlx7hpjjv5" class="bds_more">分享到：</span> <a class="bds_qzone"></a> <a class="bds_tsina"></a> <a class="bds_tqq"></a> <a class="bds_renren"></a> <a class="shareCount"></a> </div> <script type="text/javascript" id="bdshare_js" data="type=tools&uid=91689" ></script> <script type="text/javascript" id="bdshell_js"></script> <script type="text/javascript"> document.getElementById("bdshell_js").src = "http://news.share.baidu.com/static/js/shell_v2.js?cdnversion=" + new Date().getHours(); </script>  </div> <div id="1zlx7hpjjv5" class="right">文章来源:<a href="">北京创联汇通电气</a> ????? 发布时间： 2021-01-30 06:20:00</div> </div> <div class="1zlx7hpjjv5" id="daodu"><span>导读：</span>向前除了一些必要的试验、?；な匝楹透萁唤邮匝楸曜冀械亩问匝橥猓赵厝缪购险⒙龀迨匝橥ǔＴ谛滦透墒奖溲蛊魍度朐诵星敖?。空载合闸冲击试验的目的是检查干式变压 </div> <p><p> 向前 </p> <p> 除了一些必要的试验、?；な匝楹透萁唤邮匝楸曜冀械亩问匝橥?，空载全电压合闸脉冲试验通常在新型干式变压器投入运行前进行?？赵睾险⒊寤魇匝榈哪康氖羌觳楦墒奖溲蛊鞯南喙乇；な欠裎蠖??？赵馗墒奖溲蛊鞒涞缡被岵擞康缌?，可达额定电流的6 ~ 8倍。励磁涌流开始迅速衰减，可在0.5 ~ 1 s内降至额定电流的0.25 ~ 0.5倍，但衰减需要较长时间才能完成，中小型干式变压器约需几秒钟，大型干式变压器需10 ~ 20 s。因此，在励磁涌流衰减的初始阶段，差动?；ぞ７⑸收?，导致干式变压器的故障。因此，在励磁涌流的作用下，可以在空载冲击切换时实际检查差动?；さ慕酉?、特性和整定值，并对?；つ芊裢度朐诵凶龀銎拦篮徒崧邸? </p> <p> 1浪涌电流的原因 </p> <p> 1.1涌流的机理 </p> <p> 以单相干式变压器为例，阐述了空投励磁涌流的机理。 </p> <p> 忽略干式变压器和合闸回路电阻的影响，电源电压波形为正弦波，空投瞬间干式变压器铁芯中的磁通量与施加电压的关系如下： </p> <p> 其中n是干式变压器空投侧绕组的匝数；是铁芯中的磁通量；Um是电源电压的幅度；是关闭角度；是角速度，当频率为50 Hz时，=314。 </p> <p> 考虑到电源电路和干式变压器绕组的有效电阻和损耗，可以通过求解公式(1)得到： </p> <p> 其中： </p> <p> ；t是时间常数，与闭合电路的损耗和电感有关。公式(2)中的较好项是磁通量的受迫分量；第二项是磁通量的自由分量或衰减分量。 </p> <p> 从公式(2)可以看出，干式变压器跌落瞬间铁芯中的磁通由三部分组成，即强制磁通mcos(t)、剩余磁通S和由闭合角决定的磁通mcos。根据公式(2)，在不考虑自由分量或衰减分量的情况下，假设合闸角=0，剩余磁通s=0.9 m，干式变压器铁心合闸瞬间的综合磁通变化曲线如图1所示。在图1中，曲线是施加的电压波形；曲线是铁芯中受迫磁通(或稳定磁通)的波形；曲线是干式变压器空投时铁芯内的综合磁通波形。 </p> <p> 可以看出，当初始合闸角等于0，干式变压器铁芯中剩余磁通s=0.9时，铁芯中较大磁通达到2.9 m，使得干式变压器铁芯严重饱和，励磁电流急剧增大，即产生所谓的励磁涌流。 </p> <p> 1.2影响涌入电流大小的因素 </p> <p> 从公式(2)可以看出，干式变压器空投时，铁芯中的磁通与M、cos、S有关，而涌流与铁芯中的磁通有关。磁通量越大，铁芯越饱和，涌流越大。因此，影响涌流大小的因素主要包括： </p> <p> (1)电源电压。干式变压器接通后，铁芯中受迫磁通的幅值为m=um/n，因此电源电压越高，m越大，涌入电流越大。 </p> <p> 1来源：电子发烧友 </p></p> <div class="1zlx7hpjjv5" id="prevnext"> <span>上一篇：<a href="/cpzs/3996.html">你知道干式变压器铁芯的结构吗？</a> </span>????? <span>下一篇：<a href="/cpzs/3998.html">继电?；ぶ谐１缓鍪拥奈侍?/a></span> </div> </div> </div>   <div id="1zlx7hpjjv5" class="sub_right"> <div id="1zlx7hpjjv5" class="listcon"> <h3>热点关注</h3> <ul> <li><a href='/cpzs/9535.html' 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