Abstract：For half-wave length transmission line main protection, aiming at the problems of unflavored action speed, the limitations of pilot protection and the existing local measurement based main protection have been analyzed. On this basis, a new main protection principle of ultra-high-speed local measurement-based protection is proposed, combined with the principle of wave-speed difference based single-ended fault location and half-wavelength line fault propagation characteristic. A new criterion is proposed by recognizing the time difference between arrival of line modal and zero modal travelling wave and the fault location can be determined. Meanwhile, fault direction is determined by direction criterion. With these two criteria, fault within nearly full range of the line can be covered. Compared with the existing pilot main protection, the action speed is increased by 1~2 cycles. Numerical simulations verify the effectiveness and superiority of the proposed protection principle.
陈乐, 彭咏泉, 林湘宁, 李正天, 金能. 面向接地故障辨识的半波长线路测距式超高速就地主保护新原理研究[J]. 电工技术学报, 2019, 34(24): 5234-5243.
Chen Le, Peng Yongquan, Lin Xiangning, Li Zhengtian, Jin Neng. New Ultra High Speed Local Measurement-Based Protection Principle for Half-Wave Transmission Line Ground Fault Identification. Transactions of China Electrotechnical Society, 2019, 34(24): 5234-5243.
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2019, Vol. 34 
