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class="newstit">110千伏变电站接地干式变压器保护误动原因分析</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： 2021-03-02 02:00:01</div> </div> <div class="1zlx7hpjjv5" id="daodu"><span>导读：</span>:近年来，福建某地方电网多次发生110千伏变电站接地干式变压器?；の蠖鹿剩现赜跋炝说胤降缤奈榷ㄔ诵?。为了找出问题，分析了接地干式变压器保护误动的原因，并采取了相应 </div> <p><p> :近年来，福建某地方电网多次发生110千伏变电站接地干式变压器?；の蠖鹿?，严重影响了地方电网的稳定运行。为了找出问题，分析了接地干式变压器?；の蠖脑?，并采取了相应的措施，防止类似事故再次发生，为其他电网提供参考。 </p> <p> 目前，110千伏变电站越来越多的10kV馈线采用电缆作为出线，导致10kV系统单相电容电流大幅增加。为了抑制单相接地引起的过电压幅值，110千伏变电站10kV电网系统开始安装接地干式变压器，形成低电阻接地连接方式，形成零序电流通道，使10kV系统接地时，相应的零序?；つ芨萁拥氐愕奈恢糜醒≡竦囟?，隔离接地故障，防止电弧重燃引起的过电压，保证电网设备的安全供电。 </p> <p> 2008年，某地方电网开始将110千伏变电站10kV电网系统改造为低电阻接地连接方式，并安装了接地干式变压器和接地干式变压器?；ど璞?，实现了当10kV系统任一馈线发生接地故障时，能够快速排除故障，减少对电网的影响。然而，近几天来，地区电网5座110千伏变电站发生多起接地干式变压器?；の蠖鹿?，造成变电站停电，严重影响了地区电网的稳定运行。因此，有必要采取措施防止类似事故再次发生，维护区域电网的安全稳定，并找出原因。 </p> <p> 1接地干式变压器?；の蠖蚍治? </p> <p> 当10kV馈线发生接地短路故障时，先先启动安装在110kV变电站的故障线路零序?；?，切断故障线路。当故障线路不能正确切断时，接地干式变压器的零序?；で卸夏噶睾椭鞅溲蛊髁讲嗟目兀佣衾牍收隙韵低车挠跋?。因此，防止接地干式变压器?；の蠖?，10kV馈线?；ず涂囟鞯恼沸远员Ｖさ缤踩凉刂匾Ｍü缘钡氐缤?个110千伏变电站接地干式变压器?；の蠖鹿实耐臣品治觯拥馗墒奖溲蛊鞅；の蠖闹饕蚴?0kV馈线不能正确切断接地故障。 </p> <p> 10kV馈线零序?；さ墓钩稍硎牵豪∠吡阈駽T采样馈线?；て舳囟魈ⅰ４?0kV馈线零序?；さ墓钩稍砜梢钥闯觯阈虻缌骰ジ衅?、馈线?；ず涂厥潜；ふ范鞯墓丶考?。这里从这几个方面分析接地干式变压器保护误动的原因。 </p> <p> 零序CT误差导致接地干式变压器?；の蠖?0KV馈线发生接地短路故障时，通过故障线路的零序CT检测故障电流，相应的馈线零序?；た枷惹卸瞎收舷呗?。同时，接地干式变压器的零序CT也检测到故障电流，启动保护。为了遵循选择性原则，实现10kV馈线?；さ挠畔榷?，10kV馈线零序保护电流和时间整定值小于接地干式变压器?；?。根据当前变电站运行数据，接地变压器：一次电流75A，1.5s切10kV分段，1.8s闭锁10kV自投，2.0s切低，2.5s切两侧；10kV馈线：一次电流60A，1.0s开关。 #p#分页标题#e#</p> <p> 但是由于各种原因，CT难免会有误差。如果接地干式变压器的零序CT误差为-10%，馈线的零序CT误差为10%，则两者的实际电流动作值为67.5A和66A，几乎相等。仅根据时间选择，当10KV馈线为g时 </p> <p> 电缆屏蔽层接地线不正确导致干式变压器接地?；の蠖?。110kV变电站10kV馈线采用带屏蔽层的电缆，电缆屏蔽层两端同时接地，是一种有效的电磁抗干扰措施。10KV馈线的零序电流互感器通过电缆安装在开关柜的电缆出口处?；诘绱鸥杏υ?，接地短路故障时产生的不平衡电流感应零序电流互感器上的电流，使?；ぷ爸枚鳌５缋缕帘瘟蕉私拥睾?，流经电缆屏蔽的感应电流也会感应零序CT上的电流。如果不采取措施，馈线零序?；そ荒苷范?，从而导致接地干式变压器?；ぴ郊侗；?。 </p> <p> 10kV馈线?；ぞ芏斐山拥馗墒奖溲蛊鞅；の蠖Ｄ壳?，微机?；ぷ爸迷诘缤低持械玫焦惴河τ?，?；ば阅艽蟠筇岣?。但是?；ぷ爸玫某Ъ液托秃藕芏?，产品质量和工艺不同，散热能力差。设备故障经常发生。110kV变电站?；ど璞腹收贤臣票砻鳎?0kV馈线?；ぷ爸玫牡缭床寮⒉裳寮?、CPU插件、跳闸出口插件较容易发生故障。因此，一旦出现故障，不立即处理，?；た赡芑峋芫诵校贾陆拥馗墒奖溲蛊鞅；の蠖?。 </p></p> <div class="1zlx7hpjjv5" id="prevnext"> 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