半波长交流输电线路伴随阻抗保护

发布时间：2018-11-17 13:22

【摘要】：半波长线路显著长于常规线路,传统基于集中参数的保护原理不适用于半波长线路。提出了半波长线路伴随阻抗保护,利用线路两侧保护安装处的电气量推算出故障点处的补偿电压和补偿电流,利用补偿电压和电流构建伴随阻抗,提出了伴随阻抗的动作区及动作逻辑,区外故障时,伴随阻抗表示线路任一处的容抗,区内故障时,伴随阻抗分别表示故障点处的过渡电阻及系统等值阻抗,二者显著差异,能够准确识别半波长线路的区内、外故障,利用线路两侧启动元件构造时差法,确定故障点范围,提高伴随阻抗保护的灵敏度。利用RTDS建立了特高压半波长系统仿真模型,仿真结果验证了保护方案的有效性。
[Abstract]:The half-wavelength line is significantly longer than the conventional line, and the traditional protection principle based on concentrated parameters is not suitable for the half-wavelength line. In this paper, the associated impedance protection of half-wavelength line is proposed. The compensation voltage and current at fault point are calculated by the electrical quantity of installation on both sides of the line, and the associated impedance is constructed by compensating voltage and current. In this paper, the action region and logic of the accompanying impedance are proposed. When the fault is outside the area, the adjoint impedance represents the capacitive reactance of any part of the line, and in the case of the fault in the region, the accompanying impedance represents the transition resistance at the fault point and the equivalent impedance of the system, respectively. The difference between them is significant. It can accurately identify the faults in and out of the half-wavelength line. The moveout method is constructed by using the starting elements on both sides of the line to determine the range of fault points and to improve the sensitivity of the accompanying impedance protection. The simulation model of UHV half-wavelength system is established by using RTDS. The simulation results verify the effectiveness of the protection scheme.
【作者单位】：电网安全与节能国家重点实验室(中国电力科学研究院);国网公司华中分部;
【分类号】：TM75

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