A Variable Data-Window Phaselet Transformer Differential Protection Algorithm Based on Recursive Least Square Theory

摘要：

With the application of high and extra-high voltage transformer,traditional differential protection algorithm based on half period data window will possess a switching interval of 30ms or even longer,which could hardly satisfy the quickness of protective relaying.When external fault occurs,inceptive fault transient component,inrush current,CT saturation,and harmonics would amplify the unbalance current,which easily bring about the malfunction of differential protection.This paper proposes an algorithm which based on recursive least square theory,and combine with variable data window phaselet algorithm to improve transformer differential protection.This least square based method is adaptive,and modulate the length of data window dynamically,and is accompanied by the continuous outlet frequency judgment,in order to ensure the correctness in the interferences of inrush current and inner fault.Simulation shows that algorithm is able to boost the reliability and sensitivity of transformer differential protection,and is significantly practicable than traditional methods.

关键词： Transformer:Differential Protection:Least Square Phaselet:Filter Variable Data Window

作者: Ye Wang Yuping Lu Chao Cai

作者单位: School of Electrical Engineering Southeast University Nanjing 210096,China

会议类型: 国际会议

会议名称: 2011 4th International Conference on Electric Utility Deregulation and Restructuring and Power Technologies(第四届电力设施管制、重建及能源技术国际会议 DRPT 2011)

会议地点: 威海

会议语种:英文

页码: 930-937

在线出版日期: 2011-07-06（万方平台首次上网日期，不代表论文的发表时间）