能抗励磁涌流干扰的变压器差动保护改进算法  

Improved Algorithm for Transformer Differential Protection with Ability to Resist Inrush Current Interference

作　　者：夏经德[1] 王波[1] 路亮[2] 邵文权[1] 康小宁[3] 

机构地区：[1]西安工程大学,陕西西安710048 [2]国网甘肃省电力公司,甘肃兰州730050 [3]西安交通大学,陕西西安710049

出　　处：《陕西电力》2016年第1期5-10,共6页Shanxi Electric Power

基　　金：国家自然科学基金资助项目(51207119);西安工程大学博士科研启动基金项目(BS1206)

摘　　要：针对传统变压器电流差动保护在遇到励磁涌流时无法有效躲避的问题,基于纵向阻抗的特性提出了一种变压器差动保护的改进算法。该算法建立在被采集数据相互独立的基础上,将电流制动量替换为由特定的电压转换得到的等效量,从而保证保护结果的可信性和状态分辨的冗余度。该算法不但提高了变压器差动保护抗干扰的可靠性,而且确保了对故障判别的灵敏度。通过EMTP仿真,验证了改进算法的有效性。For the inevitable difficult problem due to the inrush current interference in the traditional transformer current differential protection, the paper proposes an improved differential protection algorithm based on the characteristics of longitudinal impedance. The protection algorithm is established on the foundation of mutually independent data, and the current restraint portion is replaced by the equivalent quantity obtained from the special voltage, it ensures the credibility of the protection conclusion and the redundancy of the state resolution. The improved algorithm can not only improve the anti-interference reliability of the transformer current differential protection, but also ensure the sensitivity of the fault discrimination. The simulation results by using EMTP verify the effectiveness of the algorithm.

关 键 词：变压器 差动保护 励磁涌流 纵向阻抗 

分 类 号：TM772[电气工程—电力系统及自动化]