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1.北京四方继保自动化股份有限公司,北京市 100085
2.强电磁工程与新技术国家重点实验室(华中科技大学),湖北省武汉市 430074
金瑞(1984—),女,通信作者,工程师,主要研究方向:电力系统继电保护。E-mail:jinrui@sf-auto.com
林湘宁(1970—),男,教授,博士生导师,主要研究方向:电力系统继电保护与控制、新能源微网规划运行。E-mail:xiangning.lin@hust.edu.cn
时伯年(1976—),男,博士,教授级高级工程师,主要研究方向:电力系统稳定及广域保护。E-mail:shibonian@sf-auto.com
收稿日期:2021-06-10,
修回日期:2021-12-23,
网络出版日期:2022-03-21,
纸质出版日期:2022-07-25
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金瑞,林湘宁,时伯年.基于测量阻抗轨迹的接地距离保护自适应整定方法[J].电力系统自动化,2022,46(14):185-192.
JIN Rui,LIN Xiangning,SHI Bonian.Adaptive Setting Method of Grounding Distance Protection Based on Measured Impedance Trajectory[J].Automation of Electric Power Systems,2022,46(14):185-192.
金瑞,林湘宁,时伯年.基于测量阻抗轨迹的接地距离保护自适应整定方法[J].电力系统自动化,2022,46(14):185-192. DOI: 10.7500/AEPS20210610003.
JIN Rui,LIN Xiangning,SHI Bonian.Adaptive Setting Method of Grounding Distance Protection Based on Measured Impedance Trajectory[J].Automation of Electric Power Systems,2022,46(14):185-192. DOI: 10.7500/AEPS20210610003.
当下级线路出口发生故障时,送电侧距离保护的测量阻抗轨迹可能进入距离保护Ⅰ段的动作区内,引发超越现象。为此,首先分析并比较了区外三相和单相经过渡电阻接地2种故障情况下接地距离元件的测量阻抗轨迹的位置关系。然后,以AREVA的P443线路距离保护装置的自适应偏移阻抗圆特性为例,提出了一种基于装置故障前的测量量预估测量阻抗轨迹并实时计算动作区的方法。最后,利用PSCAD/EMTDC仿真验证了所提方法的正确性。根据所提自适应方法调整阻抗动作区的偏移量,既能实时保证距离保护Ⅰ段覆盖最大的线路范围,又能保证下级线路出口故障时距离保护不误动。
When fault occurs at the outlet of the downstream line
the measured impedance trajectory of the distance protection device on the power supply side may enter the trip area of distance protection zone Ⅰ
causing an overshoot phenomenon. In this regard
the positional relationship of the measured impedance trajectories of the grounding distance element is firstly analyzed and compared under two conditions
i.e.
three-phase fault and single-phase fault grounding through transition resistance outside the protection range. Then
taking the adaptive offset impedance circle characteristic of AREVA P443 line distance protection device as an example
a method is proposed to estimate the measured impedance trajectory based on the measurement quantities before the fault happens and to calculate the trip zone in real time. Finally
PSCAD/EMTDC simulation is used to verify the correctness of the proposed method. Adjusting the offset of the impedance trip zone according to the proposed self-adaptive method can not only ensure that the distance protection zone Ⅰ covers the largest range of the line in real time
but also ensure that the protection will not mistrip with faults at the outlet of the downstream line.
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