A Novel Busbar Protection Method Based on Polarity Comparison of Superimposed Current
A Novel Busbar Protection Method Based on Polarity Comparison of Superimposed Current
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DOI：
10.1109/tpwrd.2015.2395431
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发表时间：
2015-01
影响因子：
4.4
通讯作者：
Shenglan Song;G. Zou
中科院分区：
文献类型：
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作者：
Shenglan Song;G. Zou
提出了一种基于叠加电流极性比较的母线保护方法。分析表明，当母线发生内部故障时，与故障母线相连的所有线路对叠加电流具有相同的极性；但是对于发生在这些线路中的任何一条上的故障，故障线路上的极性与正常线路上的极性相反。根据这一重要特性，可以建立母线保护判据。为了提高母线保护方法的可靠性，在故障发生后的短时间内集成了叠加电流的波形。提出了一种新的相模变换矩阵，实现了单天线模量能反映所有故障类型。在PSCAD中建立了500千伏变电站母线的实际模型，对母线保护性能进行了评价。仿真结果表明，该保护方法适应性好，运行速度快，可靠性高。此外，其性能几乎不受故障初始条件、串联补偿、CT饱和等因素的影响。
This paper proposes a novel busbar protection method based on the polarity comparison of superimposed current. Analysis shows that all lines connected to the faulted busbar have the same polarities for the superimposed currents in case of an internal fault to busbar; but for a fault occurring on any one of these lines, the polarity on the faulted line is opposite of those on healthy lines. According to this important characteristic, the busbar protection criterion can be established. To improve the reliability of the busbar protection method, waveforms of superimposed currents are integrated within a short time after the fault. Moreover, a new phase-mode transformation matrix is proposed to realize that single aerial modulus can reflect all fault types. A real 500-kV substation busbar model was built in PSCAD to evaluate the performance of busbar protection. Simulation results demonstrate that the proposed protection method has good adaptability, fast operation speed, and high reliability. In addition, its performance is rarely influenced by the fault initial conditions, series compensation, and CT saturation, etc.