Study on a New Earth-Fault Distance Protection for Four-Circuit Transmission Lines on the same Tower

Abstract:

Since the transmission corridors are becoming more and more valuable and the demand for transmission capacity is continually increasing, the four-circuit transmission lines on the same tower have been used more and more in the high-voltage system. For this complex transmission system, there is an unpredictable mutual inductance error when measures the impedance, which will potentially cause the mal-operation of relay. Therefore, it is not feasible to use the traditional earth-fault distance protection in case of the single phase to earth fault. In this paper, twelve-sequence components method is introduced to decouple mutual electromagnetic effect between four-parallel transmission lines. Based on the analysis of the features of each component, the relationship between fault voltage and the current is presented. Furthermore, a new protection criterion for earth-fault distance protection is proposed. The new method has high sensitivity and reliability under different scenarios.

• Periodical: Advanced Materials Research (Volumes 706-708)
• Pages: 1574-1579
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.706-708.1574
• Online since: June 2013
• Authors: Pei Yu Guo, Zhon Gan Yu, Neng Ling Tai, Chun Ju Fan
• Keywords: Earthing-Fault Reactance-Relay, Four-Circuit Transmission Lines on same Tower, F-Sequence-Zero-Sequence Current, Measured Impedance, Twelve-Sequence Component Method

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