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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： 2020-11-08 15:49:54</div> </div> <div class="1zlx7hpjjv5" id="daodu"><span>导读：</span>来源：火力发电集控运行一、干式变压器常见故障、不正常运行状态及?；づ渲?内部故障：绕组相间短路、匝间短路、单相接地短路。外部故障：绝缘套管及引出线各种相间短路、 </div> <p><p style="width:100%"> 一、干式变压器常见故障、不正常运行状态及?；づ渲?/p> <p style="width:100%"> 内部故障：</p> <p style="width:100%"> 绕组相间短路、匝间短路、单相接地短路。</p> <p style="width:100%"> 外部故障：</p> <p style="width:100%"> 绝缘套管及引出线各种相间短路、单相接地短路。</p> <p style="width:100%"> 干式变压器不正常运行状态：</p> <p style="width:100%"> 过负荷、油箱漏油造成的油面降低、表面油温过高、外部短路引起的过电流、电压降低或频率升高引起的干式变压器过励磁。</p> <p style="width:100%"> （1）主保护反应干式变压器油箱内部短路故障，主保护快速跳闸，瞬时动作于全停。</p> <p style="width:100%"> a、干式变压器差动?；?/p> <p style="width:100%"> b、瓦斯?；?/p> <p style="width:100%"> c、电流速断?；?/p> <p style="width:100%"> （2）后备?；し从Ω墒奖溲蛊鞯牟徽９ぷ髯刺蟊副；ひ话惴⒏婢藕?，或延时跳闸。</p> <p style="width:100%"> 相间短路的后备保护</p> <p style="width:100%"> 接地短路的后备?；?/p> <p style="width:100%"> 过负荷?；?/p> <p style="width:100%"> 过励磁?；?/p> <p style="width:100%"> 其它非电气量?；ぃǚ从掣墒奖溲蛊饔臀?、冷却系统）</p> <p style="width:100%"> <img class="rich_pages" ratio="0.77265625" s="300,640" src="http://www.ywpw.cn/cpzs/pic/2330.png" style="width:100%" type="png" /></p> <p style="width:100%"> 二、瓦斯?；?/p> <p style="width:100%"> 基本原理：反应油箱内部所产生的气体或油流而动作。</p> <p style="width:100%"> 作用：反应干式变压器油箱内的各种故障以及油面降低。</p> <p style="width:100%"> 测量元件：瓦斯继电器</p> <p style="width:100%"> 出口方式：轻瓦斯?；ざ?，一般只发告警信号。</p> <p style="width:100%"> 重瓦斯保护动作，发跳闸命令。跳开干式变压器各侧断路器；对于发变组接线，保护动作于全停、启动快切。</p> <p style="width:100%"> <img class="rich_pages" ratio="0.8235294117647058" s="300,640" src="http://www.ywpw.cn/cpzs/pic/2331.png" style="width:100%" type="png" /></p> <p style="width:100%"> 三、干式变压器纵差动?；?/p> <p style="width:100%"> 1.基本原理:电流差动原理的应用</p> <p style="width:100%"> 一　干式变压器纵差?；さ墓钩稍砑敖酉?/p> <p style="width:100%"> 干式变压器纵差保护的构成原理也是基于基尔霍夫较好定律，即</p> <p style="width:100%"> </p> <p style="width:100%"> 式中：－干式变压器各侧电流的向量和。</p> <p style="width:100%"> <img class="rich_pages" ratio="1.738831615120275" s="300,640" src="http://www.ywpw.cn/cpzs/pic/2332.png" style="width:100%" type="png" /></p> <p style="width:100%"> 二　实现干式变压器纵差?；さ募际跄训?/p> <p style="width:100%"> 1、干式变压器两侧电流的大小及相位不同</p> <p style="width:100%"> 2、稳态不平衡电流大</p> <p style="width:100%"> （1）干式变压器有激磁电流</p> <p style="width:100%"> （2）干式变压器带负荷调压</p> <p style="width:100%"> （3）两侧差动TA的变比与计算变比不同</p> <p style="width:100%"> 干式变压器型号SFL1—8000/35，变比38.5/6.3</p> <p style="width:100%"> <img class="rich_pages" ratio="0.6379310344827587" s="300,640" src="http://www.ywpw.cn/cpzs/pic/2333.png" style="width:100%" type="png" /></p> <p style="width:100%"> 3　暂态不平衡电流大</p> <p style="width:100%"> （1）两侧差动TA型号、变比及二次负载不同</p> <p style="width:100%"> （2）空投干式变压器的励磁涌流</p> <p style="width:100%"> （3）干式变压器过激磁</p> <p style="width:100%"> （4）大电流系统侧接地故障时干式变压器的零序电流</p> <p style="width:100%"> 三　空投干式变压器的励磁涌流</p> <p style="width:100%"> 涌流中含有很大的直流分量；</p> <p style="width:100%"> 波形是间断的，且间断角很大</p> <p style="width:100%"> 由于波形间断，使其在一个周期内正半波与负半波不对称；</p> <p style="width:100%"> 含有很大的二次谐波分量</p> <p style="width:100%"> 在同一时刻三相涌流之和近似等于零</p> <p style="width:100%"> <img class="rich_pages" ratio="0.8356164383561644" s="300,640" src="http://www.ywpw.cn/cpzs/pic/2334.png" style="width:100%" type="png" /></p> <p style="width:100%"> 四　干式变压器纵差?；さ氖迪?/p> <p style="width:100%"> 1　差动?；ち讲嗟缌鞯囊葡喾绞?/p> <p style="width:100%"> 两类：通过改变差动TA接线方式移相（即由硬件移相）；由计算机软件移相</p> <p style="width:100%"> （1）改变差动TA接线方式进行移相</p> <p style="width:100%"> 如干式变压器为Y，d11接线其相位补偿的方法是将干式变压器星形侧的电流互感器接成三角形，将干式变压器三角形侧的电流互感器接成星形，以补偿30°的相位差。</p> <p style="width:100%"> <img class="rich_pages" ratio="1.4429223744292237" s="300,640" src="http://www.ywpw.cn/cpzs/pic/2335.png" style="width:100%" type="png" /></p> <p style="width:100%"> <img class="rich_pages" ratio="1.0136363636363637" s="300,640" src="http://www.ywpw.cn/cpzs/pic/2336.png" style="width:100%" type="png" /></p> <p style="width:100%"> <img class="rich_pages" ratio="1.1890660592255125" s="300,640" src="http://www.ywpw.cn/cpzs/pic/2337.png" style="width:100%" type="png" /></p> <p style="width:100%"> （2）接入辅助TA的移相方式</p> <p style="width:100%"> 对于YN,d接线的干式变压器，其差动TA的接线为Y，y，而在?；ぷ爸弥猩柚靡蛔楦ㄖ鶷A，接成d形，接入干式变压器高压侧差动TA二次，对该侧电流进行移相，以达到正常工况下使各相差动元件两侧电流相位相反的目的。</p> <p style="width:100%"> （3）用软件对高压侧电流移相</p> <p style="width:100%"> 即采用计算差动TA二次两相电流差的方式。</p> <p style="width:100%"> 当干式变压器的接线组别为YN,d11时，在Y侧流入A、B、C三个差动元件的计算电流，应分别取</p> <p style="width:100%"> <img class="rich_pages" ratio="0.5662650602409639" s="300,640" src="http://www.ywpw.cn/cpzs/pic/2338.png" style="width:100%" type="png" /></p> <p style="width:100%"> <img class="rich_pages" ratio="0.5843373493975904" s="300,640" src="http://www.ywpw.cn/cpzs/pic/2339.png" style="width:100%" type="png" /></p> <p style="width:100%"> <img class="rich_pages" ratio="0.5714285714285714" s="300,640" src="http://www.ywpw.cn/cpzs/pic/2340.png" style="width:100%" type="png" /></p> <p style="width:100%"> 对于Y，d接线的干式变压器，当用计算机软件对某侧电流移相时，差动TA的接线均采用Y，y。</p> <p style="width:100%"> （4）用软件在低压侧移相方式</p> <p style="width:100%"> 在干式变压器低压侧，将差动TA二次各相电流移相的角度，也由干式变压器的接线组别决定。当干式变压器接线组别为YN,d11时，则应将低压侧差动TA二次三相电流以次向滞后方向移动30度；</p> <p style="width:100%"> 3　差动元件各侧之间的平衡系数</p> <p style="width:100%"> 若干式变压器两侧差动TA二次电流不同，则从两侧流入各相差动元件的电流大小亦不相同，从而无法满足</p> <p style="width:100%"> <img class="rich_pages" ratio="0.5301204819277109" s="300,640" src="http://www.ywpw.cn/cpzs/pic/2341.png" style="width:100%" type="png" /> 。</p> <p style="width:100%"> </p> <p style="width:100%"> 在微机型干式变压器?；ぶ校昧艘桓鼋礁龃笮〔坏鹊牡缌髡鬯愠勺饔猛耆嗤缌鞯钠胶庀凳?。</p> <p style="width:100%"> 根据干式变压器的容量，接线组别、各侧电压及各侧差动TA的变比，可以计算出差动两侧之间的平衡系数。</p> <p style="width:100%"> <img class="rich_pages" ratio="0.33648393194706994" s="300,640" src="http://www.ywpw.cn/cpzs/pic/2342.png" style="width:100%" type="png" /></p> <p style="width:100%"> 下面举例计算电流平衡系数，干式变压器容量31.5/31.5/31.5，变比110/38.5/11,接线方式Y0/Y/d</p> <p style="width:100%"> <img class="rich_pages" ratio="0.42964352720450283" s="300,640" src="http://www.ywpw.cn/cpzs/pic/2343.png" style="width:100%" type="png" /></p> <p style="width:100%"> 五　微机干式变压器纵差?；?/p> <p style="width:100%"> 1、比率制动特性的差动元件的原理</p> <p style="width:100%"> （1）动作方程</p> <p style="width:100%"> （II）二段折线式差动元件</p> <p style="width:100%"> <img class="rich_pages" ratio="0.39609483960948394" s="300,640" src="http://www.ywpw.cn/cpzs/pic/2344.png" style="width:100%" type="png" /></p> <p style="width:100%"> <img class="rich_pages" ratio="0.5354330708661418" s="300,640" src="http://www.ywpw.cn/cpzs/pic/2345.png" style="width:100%" type="png" /></p> <p style="width:100%"> <img class="rich_pages" ratio="0.9946308724832215" s="300,640" src="http://www.ywpw.cn/cpzs/pic/2346.png" style="width:100%" type="png" /></p> <p style="width:100%"> 三段折线式差动元件的动作特性曲线</p> <p style="width:100%"> 2　涌流闭锁元件</p> <p style="width:100%"> （1）二次谐波制动原理</p> <p style="width:100%"> 利用差动元件差电流中的二次谐波分量作为制动量，区分出差流是故障电流还是励磁涌流，实现躲过励磁涌流。</p> <p style="width:100%"> （2）间断角原理</p> <p style="width:100%"> 干式变压器内部故障时，故障电流波形无间断；而干式变压器空投时，励磁涌流的波形是间断的，具有很大的间断角（一般大于150度）。按间断角原理构成的差动?；?，是根据差电流波形是否有间断及间断角的大小来区分故障电流与励磁涌流的。</p> <p style="width:100%"> （3）波形对称原理</p> <p style="width:100%"> 在微机型干式变压器纵差保护中，采用波形对称算法，将励磁涌流同干式变压器故障电流区分开来。励磁涌流，波形间断不对称。</p> <p style="width:100%"> （4）磁制动原理</p> <p style="width:100%"> 磁制动涌流闭锁原理，是利用计算干式变压器的磁通特性来区分励磁涌流与故障电流的</p> <p style="width:100%"> 3 过激磁闭锁元件</p> <p style="width:100%"> 运行中的干式变压器，当由于某种原因造成过激磁时，可能导致纵差?；の蠖?。对于超高压大型干式变压器，为防止过激磁运行时纵差?；の蠖?，设置过激磁闭锁元件。当干式变压器过激磁时，将纵差?；け账?。</p> <p style="width:100%"> 干式变压器纵差?；さ墓ご疟账?，实际上是采用5次谐波电流制动元件。即当差流中的5次谐波分量大于某一值时，将差动?；け账?/p> <p style="width:100%"> 4　差动速断元件</p> <p style="width:100%"> 当干式变压器内部严重故障TA饱和时，TA二次电流的波形将发生严重畸变，其中含有大量的谐波分量，从而使涌流判别元件误判断成励磁涌流，致使差动?；ぞ芏蜓踊憾鳎现厮鸹蹈墒奖溲蛊?。</p> <p style="width:100%"> 为此设置差动速断元件。差动速断元件反映的也是差流。与差动元件不同的是：它反映差流的有效值。不管差流的波形如何及含有谐波分量的大小，只要差流的有效值超过了整定值，它将迅速动作而切除干式变压器。</p> <p style="width:100%"> （1）启动电流对启动电流的整定原则是：可靠地躲过正常工况下较大的不平衡差流。</p> <p style="width:100%"> （2）拐点电流</p> <p style="width:100%"> <img class="rich_pages" ratio="0.16326530612244897" s="300,640" src="http://www.ywpw.cn/cpzs/pic/2347.png" style="width:100%" type="png" /></p> <p style="width:100%"> ⑶ 比率制动系数S</p> <p style="width:100%"> 比率制动系数S的整定原则，按躲过干式变压器出口三相短路时产生的较大不平衡差流来整定。</p> <p style="width:100%"> </p> <p style="width:100%"> 六、干式变压器各保护装置的配置原则</p> <p style="width:100%"> （一）气体?；さ呐渲迷?/p> <p style="width:100%"> 0.8MVA及以上油浸式干式变压器应装设瓦斯保护。当油箱内故障产生轻微瓦斯或油面下降时，应瞬时动作于信号；当产生大量瓦斯时，应动作于断开干式变压器各侧断路器。</p> <p style="width:100%"> （二）差动保护的配置原则</p> <p style="width:100%"> 对于干式变压器引出线、套管及内部短路故障，应装设纵联差动?；?。?；に彩倍饔诙峡墒奖溲蛊鞯母鞑喽下菲?。</p> <p style="width:100%"> 对6.3MVA及以上并列运行干式变压器，10MVA及以上单先运行的干式变压器，以及2MVA及以上用电流速断?；ち槊粜圆环弦蟮母墒奖溲蛊?，应装设纵联差动保护。</p> <p style="width:100%"> 10MVA以下干式变压器可装设电流速断保护或过电流?；?/p> <p style="width:100%"> （三）过电流保护的配置原则</p> <p style="width:100%"> 过电流?；ぷ魑墒奖溲蛊魍獠肯嗉涠搪凡⒆魍咚贡；ず妥萘疃；ぃɑ虻缌魉俣媳；ぃ┑暮蟊?。</p> <p style="width:100%"> 包括过电流?；ぁ⒌偷缪蛊鸲墓缌鞅；?、复合电压起动的过电流?；ぁ⒏盒虻缌鞅；ず妥杩贡；?，保护动作后应带时限动作于跳闸。</p> <p style="width:100%"> 过电流保护宜用于降压干式变压器。</p> <p style="width:100%"> 复合电压起动的过电流保护，宜用于升压干式变压器、系统联络干式变压器和过电流?；げ宦懔槊粜砸蟮慕笛垢墒奖溲蛊?。</p> <p style="width:100%"> 负序电流和单相式低电压起动过电流?；ぃ捎糜?3MVA及以上升压干式变压器。</p> <p style="width:100%"> 当采用上述2）、3）的?；げ荒苈懔槊粜院脱≡裥砸笫保刹捎米杩贡；?。</p> <p style="width:100%"> （四）零序电流的配置原则</p> <p style="width:100%"> 零序电流?；し从Υ蠼拥氐缌飨低持懈墒奖溲蛊魍獠拷拥囟搪返牧阈虻缌鞅；?。110kV及以上大接地电流系统中，如果干式变压器中性点可能接地运行，对于两侧或三侧电源的升压干式变压器或降压干式变压器应装设零序电流?；?，作干式变压器主保护的后备?；ぃ⒆魑嗔谠暮蟊副；?。</p> <p style="width:100%"> （四）过负荷?；ぷ爸玫呐渲迷?/p> <p style="width:100%"> 当台数并列运行或单先运行并作为其他负荷的备用电源时，应根据可能过负荷的情况装设过负荷?；?。</p> <p style="width:100%"> 对自耦干式变压器和多绕组干式变压器，保护装置应能反应公共绕组及各侧过负荷的情况。</p> <p style="width:100%"> 过负荷保护应接于一相电流上，带时限动作于信号。在无经常值班人员的变电所，必要时过负荷?；た啥饔谔⒒蚨峡糠指汉伞?/p> <p style="width:100%"> （五）冷却系统?；づ渲迷?/p> <p style="width:100%"> 对干式变压器冷却系统故障，装设冷却器全停?；ぷ爸?。</p> <p style="width:100%"> 当冷却系统故障切除全部冷却器时，允许带额定负载运行20min,如20min后顶层温度尚未达到75?，则允许上升到75?，但较长运行时间不得超过1h</p> <p style="width:100%"> 对装有冷却系统装置的干式变压器，同时应设温度测量系统，并动作信号及启动有关备用或辅助冷却器。</p> <p style="width:100%"> （一）气体?；さ耐肚性?/p> <p style="width:100%"> 干式变压器运行时，气体?；ぷ爸糜有藕藕吞?。</p> <p style="width:100%"> 有载调压分接开关的气体保护应接跳闸。</p> <p style="width:100%"> 用一台断路器控制两台干式变压器时，如其中一台转入备用，应将备用干式变压器重瓦斯改接信号。</p> <p style="width:100%"> 干式变压器在运行中滤油、补油、换替油泵等，应将重瓦斯改接信号。</p> <p style="width:100%"> 当油位计的油面异常升高或呼吸系统有异常现象，需要打开放气或油阀门时，应先将重瓦斯改接信号。</p> <p style="width:100%"> （二）差动?；さ耐肚性?/p> <p style="width:100%"> 新干式变压器在新投入充电时，差动?；びν度胩⑽恢?。在充电无异常后，应将差动?；ね顺?，做测试极性、相位无异常后，方可投入跳闸。</p> <p style="width:100%"> 差动二次回路有工作时，应将差动?；ね顺鲈诵?。</p> <p style="width:100%"> 如确属差动保护回路误动作，将主干式变压器跳闸，可将差动?；ね顺?，先行试送主干式变压器，并对差动保护回路进行检查、处理。</p> <p style="width:100%"> </p> <p style="width:100%"> 【免责声明】文章为作者先立观点，不代表创联汇通干式变压器立场。如因作品内容、版权等存在问题，请于本文刊发30日内联系创联汇通干式变压器进行删除或洽谈版权使用事宜。</p> <p> </p> </p> <div class="1zlx7hpjjv5" id="prevnext"> <span>上一篇：<a href="/cpzs/2707.html">干式变压器容量单位KVA和KW的区别与换</a> </span>????? <span>下一篇：<a href="/cpzs/2711.html">山东电科院开展10千伏变压器“碰壳”</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' title='河南创联汇通干式变压器其他特点'>河南创联汇通干式变压器其他特点</a></li> <li><a href='/cpzs/9534.html' title='河南创联汇通干式变压器的节能优势'>河南创联汇通干式变压器的节能优势</a></li> <li><a href='/cpzs/9533.html' 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