An Optimization Method of Distance Protection for Parallel Lines on the same Tower

Abstract

When used in parallel transmission lines on the same tower or dealing with high resistance fault, the measuring impedance of traditional distance protection becomes inaccurate due to the influence of transition resistance and zero-sequence mutual inductance, thus affect protection range and action speed of corresponding distance algorithm. An optimization method of distance protection for double circuit transmission lines on the same tower is proposed. A fault location method based on the phase relation of sequence currents at local terminal is constructed by using the structural characteristics of parallel lines. It can quickly and accurately identify the fault and obtain the fault location by using single terminal information, and has a wide range of application scenarios. The EMTDC simulation results verify the effectiveness of this method.