Comparative study of traveling wave differential protection and current differential protection for power lines
DOI：10.7667/PSPC171696
Key Words:relay protection  power lines  traveling wave differential protection  current differential protection  distributed capacitive current
Author NameAffiliation
DONG Xinzhou State Key Lab of Control and Simulation of Power Systems and Generation Equipments Dept of Electrical Engineering, Tsinghua University, Beijing 100084, China 
LEI Aoyu State Key Lab of Control and Simulation of Power Systems and Generation Equipments Dept of Electrical Engineering, Tsinghua University, Beijing 100084, China 
TANG Lanxi State Key Lab of Control and Simulation of Power Systems and Generation Equipments Dept of Electrical Engineering, Tsinghua University, Beijing 100084, China 
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Abstract:The current differential protection of power lines is based on the RL lumped parameter line model and the principle of charge continuity. The traveling wave differential protection of power lines is based on the distributed parameter line model and the principle of traveling wave transmission invariance. This paper conducts a detailed comparative study on these two types of differential protections for application on power lines from the view of theory and simulation. The essential difference between the above two protections is that the traveling wave differential protection considers the distributed parameter characteristic and the spatial propagation characteristic of a line, whereas the current differential protection regards the line as a node and completely neglects the distributed parameter characteristic and the spatial propagation characteristic of a line. In fact, the differential current is the degradation form of the traveling wave differential current. For UHV long distance transmission lines, the traveling wave differential protection has a superior performance over the current differential protection. For HV and EHV transmission lines, there is no significant performance difference between the traveling wave differential protection and the current differential protection. The current differential protection is qualified for this kind of transmission line. This work is supported by National Key Research and Development Program of China (No. 2016YFB0900600).
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