自耦变压器零序电流方向纵联保护  

Study on zero-sequence current directional comparison protection of autotransformer

作　　者：索南加乐[1] 阿里木江·卡德尔[1,2] 张燕涛[3] 孙金凤[3] 

机构地区：[1]西安交通大学电气工程学院,陕西西安710049 [2]新疆大学电气工程学院,新疆维吾尔自治区乌鲁木齐830008 [3]西安供电局,陕西西安710032

出　　处：《电力科学与技术学报》2008年第4期27-32,共6页Journal of Electric Power Science And Technology

基　　金：国家自然科学基金(50677051);国家科技攻关计划(2005BA208C)

摘　　要：高压大容量自耦变压器在高、中压侧常配有零序电流差动保护,以提高对接地故障的灵敏性,但其受电流互感器饱和影响较大,不易整定.据此提出一种自耦变压器零序电流方向纵联保护原理,通过比较自耦变高、中压侧零序电流和中性点零序电流相位实现保护判别,该原理能够灵敏地反应变压器的匝地和匝间故障,受电流互感器饱和影响小.仿真和动模试验数据验证了该方法的可行性.In order to enhance the sensitivity of ground fault protection, zero-sequence current differential protection is often applied to large capacity autotransformers. With the influence of current transformer saturation, it＇s difficult to choose a proper setting threshold. To solve this problem, a new type zero-sequence current directional comparison protection is proposed in this paper. The new method compares the phase angle of high-voltage side zero-sequence current, middle-voltage side zero-sequence current and the neutral current to decide the fault region. It can sensitively detect the coil-ground, coil-coil fault in transformer, and can basically avoid the infection of current transformer saturation. Computer and dynamic simulation results verify the above characteristics of the proposed protection method.

关 键 词：自耦变压器 零差保护 故障方向 TA饱和 

分 类 号：TM771[电气工程—电力系统及自动化] TM411.3