An improved pilot zero-sequence power directional relay scheme
DOI：10.19783/j.cnki.pspc.191032
Key Words:pilot zero-sequence relay  magnetically-strong and electrically-weak  parallel transmission lines  crossline fault  sensitivity
Author NameAffiliation
XUE Mingjun Guodian Nanjing Automation Co., Ltd., Nanjing 211100, China
Nanjing SAC Automation Co., Ltd., Nanjing 211153, China 
YANG Liming Guodian Nanjing Automation Co., Ltd., Nanjing 211100, China
Nanjing SAC Automation Co., Ltd., Nanjing 211153, China 
ZHANG Xiang Guodian Nanjing Automation Co., Ltd., Nanjing 211100, China
Nanjing SAC Automation Co., Ltd., Nanjing 211153, China 
CHEN Fufeng Guodian Nanjing Automation Co., Ltd., Nanjing 211100, China
Nanjing SAC Automation Co., Ltd., Nanjing 211153, China 
ZOU Lei Guodian Nanjing Automation Co., Ltd., Nanjing 211100, China
Nanjing SAC Automation Co., Ltd., Nanjing 211153, China 
CHEN Shi Guodian Nanjing Automation Co., Ltd., Nanjing 211100, China
Nanjing SAC Automation Co., Ltd., Nanjing 211153, China 
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Abstract:Compared with single-circuit transmission lines, the zero-sequence characteristics of double-circuit and multi-circuit transmission lines on the same tower are more complex and changeable, resulting in frequent maloperation of traditional pilot zero-sequence directional protection. First, the performance of traditional zero sequence directional protection is analyzed from three aspects: sensitivity, weak current and strong magnetism and crossline fault, and the existing problems are pointed out. Then, a novel pilot zero-sequence directional protection scheme is proposed. A zero-sequence directional voltage compensation algorithm is used to enhance the sensitivity of zero-sequence directional elements under high resistance faults, and zero-sequence integrated directional elements are used to eliminate the influence of zero-sequence mutual inductance. Thus a cross-line fault identification logic is constructed. Finally, the effectiveness of the proposed algorithm is verified by three field examples. This work is supported by Youth Fund of National Natural Science Foundation of China (No. 51507050) and Young Elite Scientists Sponsorship Program by CSEE (No. CSEE-YESS-2017).
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