By Topic

Transmission line pilot protection principle based on integrated impedance

Sign In

Cookies must be enabled to login.After enabling cookies , please use refresh or reload or ctrl+f5 on the browser for the login options.

Formats Non-Member Member
$33 $33
Learn how you can qualify for the best price for this item!
Become an IEEE Member or Subscribe to
IEEE Xplore for exclusive pricing!
close button

puzzle piece

IEEE membership options for an individual and IEEE Xplore subscriptions for an organization offer the most affordable access to essential journal articles, conference papers, standards, eBooks, and eLearning courses.

Learn more about:

IEEE membership

IEEE Xplore subscriptions

3 Author(s)
J. Suonan ; School of Electrical Engineering, Xi'an Jiaotong University, Xi'an, Shaanxi, People's Republic of China ; X. Deng ; K. Liu

Based on the ratio between the sum of two terminal-voltage phasors of the transmission line and that of two terminal-current phasors of the same line, which is defined as integrated impedance in this study, a novel transmission line pilot protection principle is proposed. When an external fault of the transmission line occurs, the imaginary part of the integrated impedance which reflects the capacitance impedance of the line is negative and with a great modulus. When an internal fault of the transmission line occurs, the imaginary part of the integrated impedance of faulty phase which generally reflects the impedance of the system source and the line is either positive or negative and with a relatively small modulus. According to such a characteristic, the external fault and the internal fault of transmission line can be distinguished. The criterion proposed in this study is not affected by the capacitive current. It can be applied to the line with or without shunt reactor. Moreover, the threshold of the criterion can be easily set. Simulation results of electro-magnetic transient program (EMTP) and dynamic physical test data both verify the high sensitivity and reliability of the proposed principle.

Published in:

IET Generation, Transmission & Distribution  (Volume:5 ,  Issue: 10 )