[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"$fR7S70rMkakU5QtzwtBfx6CIWNsPjjI5QHHcGTZDxzU8":3},{"answer":4,"createTime":5,"id":6,"options":7,"origin":12,"question":19,"related":20,"source":30,"type":31},[],"2023-06-16 18:45:31",65670925,[8,9,10,11],"渐增型正弦波","渐减型余弦波","恒定方波","间断角衰减周波",{"count":13,"courseId":14,"courseImg":15,"courseName":16,"workId":17,"workName":18},34,"f24fe9307e6f39ae3f245ecb524e4d2f","https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F03a579384a6dc297c89809b582fcc767.png","继电保护","work_28305052","7.3变压器励磁涌流与相位补偿作业","励磁涌流的电流波形是",[21,32,41,44,53,62,71,80,89,98],{"answer":22,"createTime":5,"id":23,"options":24,"question":29,"source":30,"type":31},[],65670923,[25,26,27,28],"变压器过负荷合闸","变压器轻载拉闸","变压器空载合闸","变压器带负荷调压","电力变压器励磁涌流出现在 或外部故障切除后,其值较大,甚至达10倍额定电流,但持续时间较短,可能导致某些保护误动","v1",0,{"answer":33,"createTime":5,"id":34,"options":35,"question":40,"source":30,"type":31},[],65670924,[36,37,38,39],"非周期分量","周期分量","负序分量","零序分量","电力变压器用的励磁涌流含有大量的直流分量和",{"answer":42,"createTime":5,"id":6,"options":43,"question":19,"source":30,"type":31},[],[8,9,10,11],{"answer":45,"createTime":5,"id":46,"options":47,"question":52,"source":30,"type":31},[],65670926,[48,49,50,51],"不动作,因为不是故障,保护设计时应躲过励磁涌流影响而误动","立即动作,属于变压器故障,瞬时作用于跳闸","不动作,属于不正常运行状态,保护只发信号","立即动作,属于属于不正常运行状态,延时跳闸并发信号","当电力变压器产生的励磁涌流幅值大于纵差保护定值时,保护应该",{"answer":54,"createTime":5,"id":55,"options":56,"question":61,"source":30,"type":31},[],65670927,[57,58,59,60],"存在非周期分量","含有大量直流分量和二次谐波分量","波形幅值衰减速度快并有间断角","励磁涌流与短路电流一样是衰减的正弦波周期分量","对励磁涌流的特点说法错误的是",{"answer":63,"createTime":5,"id":64,"options":65,"question":70,"source":30,"type":31},[],65670928,[66,67,68,69],"波形对称性辨别,当波形在正负半周严重不对称时认为是励磁涌流,闭锁保护","二次或五次谐波制动,当谐波含量超过一定比利时认为是励磁涌流,保护制动而闭锁","间断角原理判别,当波形间断角大于一定度数时认为是励磁涌流,闭锁保护","增大保护动作定值,当定值大于励磁涌流时保护就不会误动","目前电力系统一般采取什么措施防止励磁涌流引起变压器纵差保护误动呢?下列说法错误的是",{"answer":72,"createTime":5,"id":73,"options":74,"question":79,"source":30,"type":31},[],65670929,[75,76,77,78],"为了防止当短路电流太大时会使纵联差动保护因磁通饱和而闭锁保护,导致拒动","为了使保护在没有励磁涌流时加速跳闸,缩短保护动作时间","为了使保护更准确的判断励磁涌流,不至于保护误动","为了防止因为短路电流太小保护无法区分于励磁涌流,导致保护误动","微机型纵联差动保护一般配有差动速断保护,差动速断保护不同于纵联差动保护,它是不经过励磁涌流闭锁的直接作用于跳闸的保护,它一定不能在励磁涌流作用下误动,因而该保护动作电流特别大,安装该保护的主要作用是",{"answer":81,"createTime":5,"id":82,"options":83,"question":88,"source":30,"type":31},[],65670930,[84,85,86,87],"被保护设备各侧电流相位不一致导致保护电流差结果偏差太大,引起保护误动或拒动,因而在二次侧需加装相位调整设备或改变接线,使输入差动保护的电流相位一致","各侧电流互感器因型号和误差相差太的,容易引起保护误动或拒动,因而在二次侧需加装相位调整设备或改变接线,使输入差动保护的电流相位一致","各侧电流互感器接线不一致导致保护电流差结果偏差太大,引起保护误动或拒动,因而在二次侧需加装相位调整设备或改变接线,使输入差动保护的电流相位一致","D输入差动计算设备的电流相位偏差太小,不足以保护在短路时动作,因而需加装相位补偿设备,使其可靠动作","差动保护的相位补偿是指",{"answer":90,"createTime":5,"id":91,"options":92,"question":97,"source":30,"type":31},[],65670931,[93,94,95,96],"两侧加装相位变换器","在Y侧加装变相器","在d侧电流互感器 接成y形,在Y侧电流互感器接成d形","在d侧电流互感器 接成d形,在Y侧电流互感器接成y形","对于型号为Y-d11的双绕组变压器纵传统联差动保护的相位补偿措施一般采用",{"answer":99,"createTime":5,"id":100,"options":101,"question":106,"source":30,"type":31},[],65670932,[102,103,104,105],"将各侧不同大小和相位的电流折算成大小相同方向相反的等值电流实现相位补偿","将各侧不同大小和相位的电流折算成大小相同方向相同的等值电流实现相位补偿","将各侧不同大小和相位的电流通过加装相位补偿器实现相位补偿","将各侧不同大小和相位的电流通过调节互感器变比实现相位补偿","对于微机纵差保护的相位补偿可以采用"]