Current Differential Protection for Distributed Transmission Lines using Low Sampling Frequency

Current differential protection has been affected negatively by the distributed capacitive current of transmission lines. In order to solve the problem of distributed capacitance current of transmission line, the current differential protection in this paper is based on distributed parameters model of the transmission line. The current formula along with the transmission line is derived under this distributed parameter line model. The differential criterion is constructed with the current calculated from both ends to the set point. In order to improve the practicality of the criterion, the implementation of the differential protection is given under low sampling frequency. By adding a cubic spline data interpolation point at each sampling interval, the calculation of the set point distributed current under low sampling frequency is achieved. In order to improve the operating speed of current differential protection, the point is set at the midpoint of the line, and the magnitude of the current is calculated with a half data window absolute value integrals. The results show that the proposed novel current differential principle is not affected by the distributed capacitance current. It has obvious advantages compared with traditional current differential protection principle for the low sampling frequency requirement, fast action speed and the small amount of computation.  

This work is supported by National Natural Science Foundation of China through grants No. 51037005, 51177127 and National Basic Research Program of China (973 Program) (2012CB215105).   

   M. Arshad Shehzad Hassan, Xi’an Jiaotong University, Xi’an, China, Email: arxhad@yahoo.com, Tel: +92-0344-7306780

   Guobing Song, Xi’an Jiaotong University, Xi’an, China, Email: song.gb@mail.xjtu.edu.cn, Tel: +86-13572131892

   Xiaoning Kang, Xi’an Jiaotong University, Xi’an, China, Email: kangxn@mail.xjtu.edu.cn, Tel: +86-13519195338

   Zaibin Jiao, Xi’an Jiaotong University, Xi’an, China, Email: jiaozaibin@mail.xjtu.edu.cn, Tel: +86-13572881504

   Chenqing Wang, Xi’an Jiaotong University, Xi’an, China, Email: wcqmorning@gmail.com, Tel: +86-13572073991

   Sohaib Tahir, Xi’an Jiaotong University, Xi’an, China, Email: sohaibchauhdary@gmail.com, Tel: +92-0332-6699333

M. Arshad Shehzad Hassan, Guobing Song, Xiaoning Kang, Zaibin Jiao, Chenqing Wang, Sohaib Tahir, "Current Differential Protection for Distributed Transmission Lines using Low Sampling Frequency" International Journal of Engineering Works, Vol. 2, Issue 3, PP. 42-47, March, 2015.        

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