摘要
多相补偿距离继电器不受系统振荡影响,但抗过渡电阻能力差,为此,提出一种具有抗过渡电阻能力的多相补偿距离继电器。通过对多相补偿距离继电器动作方程的分析,找到了过渡电阻在该动作方程中的作用项。整定点的零序电压具有同该作用项极相似的形式。通过在动作方程中引入整定点的零序电压,同时用保护整定点的电压代替故障点故障前电压,可提取该作用项。进而利用线路阻抗角和该项的实虚部,可减小或消除过渡电阻对多相补偿距离继电器的影响。基于以上原理,提出一种具有抗过度电阻能力的多相补偿距离继电器。理论分析和仿真计算证明了所提继电器具有良好的抗过渡电阻能力。
Multiphase compensated distance relay is insensitive to power swing but is highly influenced by transition resistance. In this paper a multiphase compensated distance relay insensitive to transition resistances was proposed. By analyzing the operation equation of multiphase compensated distance relay, a factor was figured out that affected the operation characteristic by transition resistances. The factor can be extracted by introducing zero sequence voltage at the setting point into comparison equation and substituting the fault voltage by the voltage at the end of the protection scope. Using the line impedance angle, and the real part and image part of the factor, the influence by the transition resistance can be eliminated. Based on the above principle, this paper proposed a multiphase compensated distance relay insensitive to transition resistances. The theoretical analysis and simulation results show that the proposed distance relay is insensitive to transition resistances.
出处
《中国电机工程学报》
EI
CSCD
北大核心
2014年第19期3220-3225,共6页
Proceedings of the CSEE
基金
国家自然科学基金重点基金项目(50937003)
国家自然科学基金重大国际合作项目(51120175001)~~
关键词
距离保护
过渡电阻
多相补偿距离继电器
单相接地故障
误差分析
distance protection
transition resistance
modified multiphase compensated distance relay
single phase to ground fault
error analysis
