多边形阻抗距离Ⅰ段保护误动分析与逻辑优化Misoperation analysis and logic optimization of distance protection section Ⅰ of polygonal impedance
钱政旭,戚宣威,曹文斌,王松,潘武略,方愉冬
QIAN Zhengxu,QI Xuanwei,CAO Wenbin,WANG Song,PAN Wulue,FANG Yudong
摘要(Abstract):
距离保护应用广泛,对于保障电网可靠运行具有重大价值。以一起距离Ⅰ段保护误动事件为例,通过分析录波并推演其计算过程,指出多边形阻抗元件动作区设置存在问题,即由于负荷限制电阻值设置不合理,导致末端故障时非故障相相间阻抗落入距离Ⅰ段动作区而引发误动。对此提出适用于多边形阻抗元件的保护逻辑优化方案,为距离Ⅰ段设置独立的负荷限制条件,实现保护逻辑的自适应优化。对优化后的保护动作区边界进行定值校验和故障回放验证,试验结果证明了优化方案的可行性。所述事例及优化方案对于提高多边形阻抗元件距离保护的可靠性具有参考意义。
The widely used distance protection is of great significance to operation reliability of power grid. The paper cites an example of misoperation of distance protection section Ⅰ and points out the defects of action zone configuration of polygonal impedance,namely the irrational resistance value due to load limit that leads to interphase impedance falling into distance protection section Ⅰ and thus triggers misoperation during terminal faults. Therefore,the paper proposes a protection logic optimization scheme applicable to polygonal impedance elements:an independent load limit condition is set for distance protection section Ⅰ for adaptive optimization of protection logic. Setting verification is performed,and fault playback is tested at the boundary of the optimized protection action zone. The rest results prove the feasibility of the optimal scheme. The case and optimal scheme mentioned above can serve as a reference for improving the reliability of distance protection that applies polygonal impedance elements.
关键词(KeyWords):
多边形阻抗元件;距离保护;负荷限制电阻
polygonal impedance element;distance protection;load limit resistance
基金项目(Foundation): 国网浙江省电力有限公司科技项目(2021ZK07)
作者(Author):
钱政旭,戚宣威,曹文斌,王松,潘武略,方愉冬
QIAN Zhengxu,QI Xuanwei,CAO Wenbin,WANG Song,PAN Wulue,FANG Yudong
DOI: 10.19585/j.zjdl.202211007
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