Fault location in radial power grid after analyzing characteristics of both single-terminal and double-terminal traveling waves

作者：Liang Rui^*; Sun Shixiang; Jin Zheng; Ma Caoyuan

来源：High Voltage Engineering, 2014, 40(5): 1461-1467.

DOI：10.13336/j.1003-6520.hve.2014.05.024

• Global position systems
• Grounding resistance
• Power distribution network
• PSCAD
• Reflected wave front
• Synchronization systems
• Time synchronization
• Traveling wave

To improve fault location in power distribution networks in both accuracy and feasibility, we propose a combined method for radial power grids, which takes into account the characteristics and application of two-terminal location methods and one terminal location methods. Since two-terminal method is relatively easier, it is firstly adopted to recognize the fault distance approximately. Then, the accurate arriving times of wave fronts are obtained by analyzing the relationship between this approximate distance and the line parameters, which involve the reflected wave fronts from the fault point and the opposite terminal of fault line. Finally, accurate results are obtained. The method not only evades errors caused by synchronization system in global position system (GPS), but also overcomes the difficulty in recognizing traveling-wave fronts. Moreover, we establish a 35 kV radial network model in PSCAD to simulate variable parameters including fault distances, grounding resistance, and fault types. The arriving times of wave fronts in the results are compared with the fault location results from two-terminal method, which indicates that the distance error is less than 100 m. It is concluded that, while confirming the one and two-terminal methods mutually, the proposed method successively improves the fault location accuracy of one-terminal methods.

• 出版日期2014
• 单位中国矿业大学（北京）