A New Adaptive Distance Protection Scheme for a Transmission Line

Abstract

In view of fault resistance to the influence of distance protection, a new adaptive distance protection scheme for a transmission line is proposed in this article. First, according to the geometric distribution of the measured phasors in fault conditions, the voltage drop equation is established and the adaptive setting coefficient is defined. On this basis, the angular difference between the fault current and the measured current is calculated according to the negative-sequence and zero-sequence components of the current. Finally, a new adaptive distance protection criterion is established. Simulation tests on the real-time digital simulator 500-kV two-machine system verify that the proposed method is able to modify the protection setting value adaptively on-line, and it is applicable to various fault types with strong immunity to the fault resistance. It is also simple in formation and easy to implement.

Keywords:

• adaptive distance protection
• voltage and current phasor diagram
• voltage drop equation
• adaptive setting coefficient
• fault resistance
• transmission line
• single-phase-to-ground fault
• phase-to-phase fault
• two-phase-to-ground fault
• three-phase fault

Additional information

Notes on contributors

Jing Ma

Jing Ma received his B.S. and Ph.D. from North China Electric Power University, China, in 2003 and 2008, respectively. He is currently an associate professor in the School of Electrical and Electronic Engineering, North China Electric Power University, China. He was a visiting scholar in the Bradley Department of Electrical and Computer Engineering, Virginia Polytechnic Institute and State University, Blacksburg, VA, USA, from 2008–2009. His major interests include power system modeling, wide-area monitoring, small-signal stability, and control.

Xin Yan

Xin Yan received his B.S. from Shandong University, China, in 2013. He is currently a master student in the School of Electrical and Electronic Engineering, North China Electric Power University, China. His interests mainly include power system protection and power restoration.

Wei Ma

Wei Ma received his B.S. and M.S. from North China Electric Power University, China, in 2012 and 2015, respectively. He is currently a staff member of State Gird Hangzhou Electric Power Supply Company, Hangzhou, China. His main interests are power system protection and power restoration.

Lvyi Sun

Lvyi Sun received her B.S. from North China Electric Power University, China, in 2014. She is currently a master student in North China Electric Power University, China. Her interests mainly include system security protection, power system control, and optimization.