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所以在<strong>变压器?；?/strong>配置技术方面需要装设避雷器保护，防止雷击过电压。保护<strong>变压器</strong>的阀型避雷器，管型避雷器或?；ぜ湎?，要求尽量靠近变压器安装，距离越近?；ばЧ胶茫话愣家笞霸诒溲蛊鞲哐共嗳鄱掀髂诓?。其接地线，应和配电变压器的金属外壳和低压侧中性点连在一起共同接地。因为一旦发生雷击损坏事故，就会造成停电，直接影响这工农业生产和人民生活。<br /> <br /> <div> 除了安装避雷针，<strong>变压器保护</strong>还可分为：<br /> <br /> 本体?；ぃ核且恢址堑缌勘；?，包括本体轻、重瓦斯?；?，有载调压轻、重瓦斯?；ひ约把沽κ头?。原理是<strong>变压器</strong>发生故障时，往往会对<strong>变压器</strong>的绝缘油造成影响，从而导致气体的产生，这时变压器的瓦斯继电器动作，本体保护就是根据不同瓦斯继电器的动作来跳闸或告警。<br /> </div> <div> 差动保护：反映<strong>变压器</strong>内部故障（包括三侧或两侧CT之间的电缆）。以三圈变为例，采集变压器三侧的电流。正常情况，根据KCL定理，流入<strong>变压器</strong>电流等于流出变压器电流，即差流为零；如果<strong>变压器</strong>内部故障，肯定有一侧的电流比较大，从而导致差流不为0，?；ざ鳌Ｈ绻峭獠抗收?，流入<a href="http://www.ywpw.cn" target="_blank"><strong>变压器</strong></a>电流仍然等于流出变压器电流，?；げ换岫?。常见的差动有差流速断、比率差动等。两圈变同理。<br /> </div> <div> 距离保护：目前用的非常少，但有用的。简单的讲就是采集电压和电流，计算阻抗，再根据计算的阻抗来判断是否动作。不建议采用。<br /> </div> <div> 过流保护：用于<strong>变压器</strong>后备<strong>?；?/strong>。反映的是变压器故障和母线故障、馈线故障。一般不仅作为变压器后备，还可以作为母线后备、馈线保护后备等。过流?；ぐǎ合嗟缌?、负序、零序；还有定时限、反时限等。<br /> </div> <div> 间隙过流和间隙过压?；ぃ翰杉?strong>变压器</strong>放电间隙的电量，对付接地故障<br /> </div> <div> 限制性接地?；ぃ和庥玫暮芏唷２捎昧阈虻缌骼磁卸?，好像也有叫零序差动保护的。<br /> </div> <div> 过负荷：包括告警、启动风冷、闭锁有载调压等<br /> <br /> <span style="text-align: center;">热过负荷：根据</span><strong style="text-align: center;">变压器</strong><span style="text-align: center;">提供的热积累特性，根据负荷电流计算变压器的热积累，分为告警和跳闸两个阶段。好像电气化铁道上比较多。</span><br /> </div> <div style="text-align: center;"> <img alt="变压器?；ば枰鍪裁词虑? src="/uploads/allimg/170512/7-1F5121H55S95.jpg" style="width: 680px; height: 480px;" /></div> <br /> <br /> <div> <strong>变压器?；?/strong>措施：</div> <div> </div> <div> 1.防御变压器油箱内部故障和油面降低的瓦斯保护。</div> <div> 2.防御变压器绕组和引线的多相短路、中性点直接接地电网侧绕组和引线的接地短路以及绕组匝间短路的纵差动?；せ虻缌魉俣媳；?。对于主变差动和发电机进行大差。</div> <div> 3.防御外部相间短路并作瓦斯?；ず妥莶疃；せ虻缌魉俣媳；ず蟊傅墓缌鞅；ぁ?/div> <div> 4.防御中性点直接接地电网中外部接地短路的零序电流?；?</div> <div> 防御对称过负荷的过负荷?；?。 </div> <br /> <span style="margin: 0px; padding: 0px; border: 0px; line-height: 23px; font-family: 'Microsoft Yahei', SimSun, sans-serif; text-indent: 28px; color: rgb(59, 59, 59); 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