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href="/pddetailthree/product/category-2952893-1.html" style="width:130px;">各种数字电桥</a> </li> <li> <a id="ctl00_ProductClass_ProductClassRepeater_ctl169_Title" title=" 氧化锌避雷器" class="maxLen" href="/pddetailthree/product/category-2953156-1.html" style="width:130px;"> 氧化锌避雷器</a> </li> <li> <a id="ctl00_ProductClass_ProductClassRepeater_ctl170_Title" title=" 万能检测仪器" class="maxLen" href="/pddetailthree/product/category-2953580-1.html" style="width:130px;"> 万能检测仪器</a> </li> </ul> </div> <div id="n8qttzop7xpq" class="rightcontent"> <div id="n8qttzop7xpq" class="images20"> 公司新闻 </div> <div id="n8qttzop7xpq" class="commontext hiddenRolling" style="text-align: center;"> <span id="ctl00_AfficheInfo_AfficheTitleLabel"><h1>变电站主变电压侧母线保护现状的分析研究</h1></span> </div> <div id="n8qttzop7xpq" class="commontext hiddenRolling"> <span id="ctl00_AfficheInfo_AfficheInfoLabel" class="content yzeditor" style="WORD-BREAK: normal"> 摘要：对<font color="#000000">变电站</font>主变电压侧<font color= "#000000">母线?；?/font>的现状和存在问题进行了分析和研究，讨论了装设快速<font color= "#000000">母线?；?/font>的必要性和可行性，并提出了两种实现母线快速?；さ男路桨浮?br>　　<br>　　关键词：<font color="#000000">变电站</font> 主变母线 ?；?br>　　<br><strong>　　1前言</strong><br>　　<br>　　在电力系统中，35kV及以下电压等级的母线由于没有稳定问题，一般不要求装设专用<font color="#000000">母线?；?/font>。但由于高压<font color="#000000">变电站</font>的10kV系统出线多、操作频繁、容易受小动物危害、设备绝缘老化和机械磨损等原因，10kV开关柜故障时有发生。经运行实践表明，虽然近年来高压开关柜的制造技术进步很快，10kV母线发生故障的机率大为减少，但仍然有因个别开关柜故障引发整段开关柜“火烧联营”的事故发生，甚至波及到变压器，造成变压器的烧毁。虽然造成此类事故的原因是多方面的，但是在发生主变低压侧母线短路故障时没有配备快速<font color="#000000">母线?；?/font>也是重要原因之一。<br>　　<br>　　<font color="#000000">变电站</font>的低压母线一般不配置专用的快速<font color="#000000">母线?；?/font>是目前典型的设计做法，是符合国标及现行的电力行业规程规范要求的。因此，长期以来，人们对低压侧<font color="#000000">母线?；?/font>一直不够重视。但是，系统内惨痛的事故教训已经引起电力企业的广泛关注，在技术上寻求新的继电保护方案也是广大继电?；すぷ髡叩墓餐竿?br>　　<br><strong>　　2低压侧<font color="#000000">母线?；?/font>的应用现状及技术要求<br>　　<br>　　2．1低压侧<font color="#000000">母线?；?/font>的应用现状</strong><br>　　<br>　　根据国标《电力装置的继电?；ず妥远爸蒙杓乒娣丁?GB50062－92)：对于发电厂和主要变电所的3～10kV母线及并列运行的双母线，只有在下列情况下才装设专用的<font color="#000000">母线?；?/font>：①需快速而有选择地切除一段或一组母线上的故障，才能保证发电厂及电力网**运行和重要负荷的可靠供电时；②当线路断路器不允许切除线路电抗器前的短路时。<br>　　<br>　　有相当一部分变压器差动的保护范围不包括低压侧断路器，其使用的电流互感器位于变压器和低压断路器之间。在<font color="#000000">变电站</font>的设计中，低压侧母线故障要靠主变压器低压侧的后备保护来切除。<br>　　<img src="http://y2.yzimgs.com/ComFolder/315275/downpic/20103292913530.jpg"><br>　　如图1所示，该图表示的是常见的220kV(110kV)<font color="#000000">变电站</font>低压母线的某一段接线情况。在主变低压侧母线或断路器发生故障时，要靠变压器低压侧的过流?；ぬ狣L1断路器来切除故障。同样的问题也存在于发电厂的6kV(10kV)厂用电系统，当中压厂用电系统发生母线故障时，要靠厂用变压器或启动／备用变压器低压侧的过流后备?；だ辞谐?。种设计方案的弊端是一旦发生母线短路故障时，故障不能被快速切除，而只能等到过流后备?；ざ鳌Ｒ蛑鞅涞秃蟊腹鞅；ざ魇奔湟话阏ㄎ?．2～2．0s，所以在切除故障时将会有较长的延时，加大设备损坏的可能，甚至引发相邻设备的大面积烧毁。<br>　　<br><strong>　　2．2对低压侧<font color="#000000">母线?；?/font>的技术要求</strong><br>　　<br>　　对低压侧<font color="#000000">母线保护</font>的要求，主要包括以下几个方面：<br>　　<br>　　(a)保护可靠性要求高，不允许拒动和误动。特别是对防止误动的要求更高，因为拒动的结果是故障还可以靠进线(或分段)的后备过流切除，与目前不配置专用母线快速?；さ慕峁且谎模侨绻欠⑸蠖?，后果很严重，直接影响到用户的供电可靠性，甚至造成**的社会影响。<br>　　<br>　　(b)?；さ墓钩删】赡芗虻?。不大量增加一次设备(如电流互感器)和外部电缆，而且施工和改造工作简单易行。<br>　　<br>　　(c)?；げ皇茉诵蟹绞降挠跋?，可以自动适应母线上连接元件的改变，如从电源进线切换到分段断路器运行，个别或部分元件的投入及退出运行，综合微机?；さ牡魇院臀ば蘩淼惹榭?。<br>　　<br>　　(d)保护既可独立安装，也可以适应安装在开关柜上的运行条件。<br>　　<br><strong>　　3两种低压侧母线快速?；し桨?br>　　<br>　　3．1采用电流互感器第三个二次线圈构成差动?；さ姆桨?/strong><br>　　<br>　　为了解决在35kV、10kV系统发生母线故障时没有快速保护的问题，*直接的方案就是配置常规的微机母线差动?；?，把所有母线段上各回路的电流量引入差动?；ぷ爸?。该方案?；た梢约凶槠敛贾迷诩痰缙魇夷冢部梢越；げ贾迷诮呖毓裆?。<br>　　<br>　　近几年，具备三个二次线圈的电流互感器开始出现和应用，这为实现低压母线短路故障的快速?；ご丛炝擞欣跫？梢岳酶髟缌骰ジ衅鞯牡谌龆蜗呷ψㄓ糜谀赶卟疃；?。为提高可靠性，?；た梢跃缪乖账?，只有在出现差电流和系统电压条件满足的条件下，?；げ拍艹隹凇２疃；ざ骱筇缭唇叨下菲?或分段断路器)。该方案的优点是构成简单，利用了目前电流互感器制造方面的新特点，开关柜投资增加不多。<br>　　<br>　　但是在实施这一方案时，经常会受到现场条件的限制。例如，在一些老式<font color="#000000">变电站</font>，因10kV系统开关柜内的电流互感器大多只有两个二次线圈，一个0．5级用于测量，一个P级用于本单元的保护。若还要增加一个用于母差保护的二次线圈，则只能再增加一组电流互感器。由于受开关柜内空间的限制，一个开关柜一般布置不下，除非再增加一个柜。这样，对由很多面柜构成的一段母线来说，造价大大增加。因此，该方案的缺点是需增加的二次电缆较多，电缆投资大，现场施工工作量大。而且，如不增加电压闭锁回路，在发生TA断线情况时，?；さ目煽啃越系?。<br>　　<br><strong>　　3．2利用各开关柜内综合保护构成的母线快速?；し桨?/strong><br>　　<br>　　其原理是：利用各开关柜综合保护提供的故障信息(硬接点)，经汇总后进行综合分析和逻辑判别，来实现低压侧母线短路故障的快速切除。母线故障的快速?；すδ堋跋馇丁痹诮弑；ぷ爸眉胺侄伪；ぷ爸媚?，不以独立的<font color="#000000">母线?；?/font>装置形态出现。<br>　　<br>　　出线上的所有单元的瞬时动作接点并联后接入后备?；ぷ爸茫员账蟊副；ぷ爸玫哪赶咚俣媳；?。当故障发生在母线之外，则必有某一个回路的综合?；し⒊霰账藕?，这样进线?；?或分段?；?被可靠闭锁；如果故障发生在母线上，则进线?；そ邮詹坏奖账藕牛欢萄邮?该延时主要是为躲开暂态过程，提高?；た煽啃?，一般小于100ms)后出口跳闸。在母线区域内发生故障时，将快速切除进线断路器，在用分段断路器带母线运行时，保护将快速切除分段断路器。该方案的构成如图2所示。<br>　　<img src="http://y2.yzimgs.com/ComFolder/315275/downpic/20103292913733.jpg"><br><strong>　　图2</strong><br>　　<br>　　该方案的特点是在构成上不需要增加和改变TA和TV设备和回路，只是在综合?；ど显黾庸钩赡赶呖焖俳拥愕呐浜辖拥?，增加的电缆也不多。其缺点:一是变压器低压侧并列运行，无法正确选择故障母线；二是低压侧出线如为有源线路，无法区分母线和线路故障；三是对相继故障（线路故障转为母线故障），可能因电流继电器返回系数问题快速<font color="#000000">母线?；?/font>不能快速动作。<br>　　<br>　　因此，此方案可作为220kV及以上<font color="#000000">变电站</font>中分段运行及无电源出线，且现有TA配置不满足加装母差?；ひ蟮牡脱共嗄赶叩目焖俦；?。<br>　　<br><strong>　　4结论</strong><br>　　<br>　　综上所述，<font color="#000000">变电站</font>低压侧常规的的保护方案显然不能满足快速切除故障的要求，在<font color="#000000">变电站</font>的低压母线上装设快速保护是很有必要的。为解决这一问题，云南电网公司在成功吸取国内外正反两方面经验和教训的基础上，于2006年下达了补充反事故措施，制定了网内完善、整改计划。2007年大理先后在500kV大理变、220kV剑川、祥云、下关<font color="#000000">变电站</font>实施了低压侧<font color="#000000">母线?；?/font>装置加装或改造，从实际运行情况看，效果显著，对电网的**可靠运行发挥了积极作用。<br><div id="n8qttzop7xpq" class="datumrelate">上一篇：<a href="/pddetailthree/news/detail-282494.html">10kV中压配电网评估及目标网架建设初探</a><br />下一篇：<a href="/pddetailthree/news/detail-286510.html">真空断路器机械特性和电气性能</a></div></span> </div> </div> </div> <div id="n8qttzop7xpq" class="classcontent"> <div id="n8qttzop7xpq" class="images51_2"> </div> <div id="n8qttzop7xpq" class="images54_2"> </div> </div> <div id="n8qttzop7xpq" class="PageTemplateControl_5" id="id_PageTemplateControl_7_container"> <div 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