基于零序电压投影系数的灵活接地系统故障选线方法  

A Fault Line Selection Method for Flexible Grounding System Based on Zero-sequence Voltage Projection Coefficient

作　　者：杨鼎 张霞 宋维庭[3] YANG Ding;ZHANG Xia;SONG Weiting(Energy Saving(Wufeng)Wind Power Co.,Ltd.,Yichang 443000,China;Wenshang Power Supply Company of State Grid Shandong Electric Power Co.,Ltd.,Jining 272501,China;Jining Power Supply Company of State Grid Shandong Electric Power Co.,Ltd.,Jining 272000,China)

机构地区：[1]中节能(五峰)风力发电有限公司,湖北宜昌443000 [2]国网山东省电力有限公司汶上供电公司,山东济宁272501 [3]国网山东省电力有限公司济宁供电公司,山东济宁272000

出　　处：《电工技术》2024年第24期221-224,共4页Electric Engineering

摘　　要：针对灵活接地系统高阻接地故障选线困难问题,首先分析了小电阻投入前后的零序电压与零序电流之间的相位差,然后以零序电流在母线零序电压方向的投影为选线特征量,以投影系数差为选线判据,提出基于零序电压投影系数的灵活接地系统故障选线方法,仿真结果验证了所提方法在高阻接地情况下的有效性。Aiming at the difficulty of high-resistance grounding fault line selection in flexible grounding system,firstly,the phase difference between zero-sequence voltage and zero-sequence current before and after small resistance input is analyzed.Secondly,the projection of zero-sequence current in the direction of bus zero-sequence voltage is taken as the characteristic quantity of line selection,and the difference of projection coefficient is taken as the criterion of line selection.A fault line selection method for flexible grounding system based on zero-sequence voltage projection coefficient is proposed.The simulation results can verify the effectiveness of the proposed method in the case of high-resistance grounding.

关 键 词：零序电压 零序电流 线路选线 过渡电阻 

分 类 号：TM773[电气工程—电力系统及自动化]