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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： 2021-03-22 02:00:00</div> </div> <div class="1zlx7hpjjv5" id="daodu"><span>导读：</span>分析了干式变压器比率差动?；ぴ诵兴俣嚷脑蚣安疃缌魉俣媳；びτ弥杏龅降奈侍?。根据故障时差动?；ざ鞯缌饔胫贫缌鞯谋戎倒叵?，提出了通过增加快速动作区来解决差动 </div> <p><p> 分析了干式变压器比率差动保护运行速度慢的原因及差动电流速断?；びτ弥杏龅降奈侍狻８莨收鲜辈疃；ざ鞯缌饔胫贫缌鞯谋戎倒叵担岢隽送ü黾涌焖俣髑唇饩霾疃；た焖俣魑侍獾姆桨浮Ｊ捣抡嫜橹ち烁梅桨改苡行岣吒玫厍现毓收舷虏疃；さ脑诵兴俣?。1.引言纵比制动差动?；?以下简称纵差保护或差动?；?是干式变压器的主要?；?。其正确动作关系到干式变压器的安全和经济效益，其动作速度关系到干式变压器的安全和电网的稳定。为了防止差动?；ひ蚶庞苛鞫蠖鳎疃；こＴ黾佣涡巢ū账?。采用二次谐波闭锁后，由于谐波对该区域严重故障的影响，差动?；ね嵫映俣?。对于大容量干式变压器，为了保证空投式干式变压器的差动保护不发生故障，往往需要降低二次谐波的制动系数(一般为15%)，二次谐波制动系数的降低进一步延缓了该区域严重故障差动?；さ脑诵兴俣?；此外，目前采用双主双后的双?；づ渲?，差动?；ひ灿Σ捎靡郧坝米骱蟊副；さ姆荰YP变压器。为了提高差动?；さ目煽啃裕疃；ぴ黾恿丝骨夤收螩T饱和的闭锁逻辑，进一步延迟了干式变压器差动?；で现毓收系亩魇奔洹Ｎ吮Ｖじ墒奖溲蛊鞯陌踩透们蚍⑸现毓收鲜毕低车奈榷ㄐ?，有必要提高干式变压器区域发生严重故障时差动?；さ脑诵兴俣取?.差动电流断线?；びτ弥杏龅降奈侍馕颂岣吒墒奖溲蛊髂诓抗收涎现厥辈疃；さ脑诵兴俣?，干式变压器?；ひ话闩渲貌疃缌鞫舷弑；?。但差动电流开断?；さ亩鞯缌魇歉莞墒奖溲蛊鞅苊饪赵睾险⑹钡慕洗罄庞苛魃瓒ǖ?，这使得其在应用中遇到以下问题：(1)干式变压器空载合闸时的较大励磁涌流难以获得，一般是根据经验值设定的，不能保证空投式干式变压器不误动作的可靠性。(2)如果整定值过大，虽然保证空投干式变压器可靠不误动作，但在干式变压器严重故障时，可能会因差动电流达不到整定值而无法运行，无法起到?；ぷ饔?。(3)如果设定值太小，空投正常干式变压器可能发生故障。即使空投干式变压器可靠，不发生故障，但当区外故障CT饱和时，也可能发生故障，影响系统运行。3.提高差动?；ざ魉俣鹊姆桨?1)差动?；ざ鞯缌饔胫贫缌鞯谋戎滴思虻シ治鑫侍猓辛礁鲆陨隙俗拥母墒奖溲蛊鞯刃桓隽蕉俗酉低?，并以两端子系统为例，分析故障时差动?；ざ鞯缌饔胫贫缌鞯谋戎倒叵怠＜偕鐴M为送电端，EN为受电端，发生内部故障时，两端的系统阻抗角基本相同。图1为等效双端系统，图2为该区域发生严重故障时两侧电流矢量图，其中为两侧电源夹角，为等效系统阻抗角。 </p> <p> 根据中的参考方向 #p#分页标题#e#</p> <p> 较好个区域是A 1.1的快速动作区，其中差动保护可以不考虑任何闭锁逻辑；第二区为A 1的作用区，该区应考虑区外断层的涌流、TA断线、TA饱和的影响，第三区为A 1的作用区，该区应考虑区外断层的涌流、TA断线、TA饱和的影响。在原有差动?；ざ魈匦缘幕∩?，设置了差动?；た焖俣鞫?。由于A 1.1不需要任何闭锁逻辑，干式变压器区发生严重故障时差动?；さ亩魇奔溆晒收系缌骶龆ǎ⒉捎盟惴?。如果采用快速算法，其典型动作时间约为10 ms，可以快速排除干式变压器区域的严重故障，保证干式变压器的安全和电网的稳定。该动作段的动作逻辑如下： </p> <p> 差动?；さ目焖俣鞑糠植恍枰没柚?。增加差动?；た焖俣鞫魏?，双面供电的大容量干式变压器可考虑差动电流开断?；?，减少整定计算带来的麻烦。(3)数值模拟试验结果 </p> <p> 数模测试系统接线示意图如图5所示。高压侧为3/2接线，中压侧为双母线，低压侧装有电抗器和电容器。在图6中，纵坐标中的电流单位是安培，横坐标是采样点数(在一个电流周期中收集24个点)。图6中黑色为差动?；た焖俣鞫蔚亩髑?，动作时间为12ms。“逐个”为差动?；さ亩飨撸魇奔湮?8.5ms，图7中，纵坐标的电流单位为安培，横坐标为采样点数(一个电流周期采集24个点)。图7中“逐个”为差动?；た焖俣鞫蔚亩飨?，黑色为差动流量中断的动作线，动作时间为12ms。发生区外故障时，由于一侧CT饱和，A相差动电流达到额定电流的16倍，A相差动电流分断保护动作，差动保护快速动作段不可靠动作。4.结论：分析了差动?；ざ骰郝闹饕蚣安疃缌魉俣媳；びτ弥杏龅降奈侍?。通过分析不同故障下差动?；ざ鞯缌饔胫贫缌鞯墓叵?，提出了一种快速切除干式变压器内部故障的差动?；ざ髀呒?，实现了快速切除 </p>除干式变压器内部严重故障的目的，保证了干式变压器的安全运行和电力系统的稳定。在增加了差动?；さ目焖俣鞫魏?，对于多侧电源的大容量干式变压器可以考虑不配置差流速断保护。</p></p> <div class="1zlx7hpjjv5" id="prevnext"> <span>上一篇：<a href="/cpzs/4527.html">温州干式变压器价格</a> 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