综合谐波算法的小电阻接地配电网高阻比率制动保护

doi:10.3969/j.issn.2097-0706.2022.01.011

综合智慧能源 ›› 2022, Vol. 44 ›› Issue (1): 80-86.doi: 10.3969/j.issn.2097-0706.2022.01.011

• 工程应用 • 上一篇

综合谐波算法的小电阻接地配电网高阻比率制动保护

倪江¹(), 孙昕炜²(), 熊晓曼¹, 任昊¹(), 杨宇玄¹()

1.国网四川省电力公司经济技术研究院,成都610041
2.国网四川省电力公司电力科学研究院,成都 610041

收稿日期:2021-08-17 修回日期:2021-12-12 出版日期:2022-01-25 发布日期:2022-02-15
作者简介:倪江（1990）,男,工程师,工学硕士,从事电力系统继电保护方面的研究, nijiang93@163.com;
孙昕炜（1991）,男,工程师,工学硕士,从事电力系统仿真分析方面的研究, sunxw09@126.com;
熊晓曼（1974）,女,高级工程师,工学硕士,从事电力系统及其自动化方面的研究;
任昊（1983）,男,高级工程师,工学硕士,从事电力系统通信规划及电力电子技术等方面的研究, rikhaw@126.com;
杨宇玄（1992）,男,工程师,工学硕士,从事电力系统继电保护方面的研究, gary_xuan@sina.com。

Ratio restraint protection for high impedance grounding faults in low resistance grounding system based on harmonic algorithm

NI Jiang¹(), SUN Xinwei²(), XIONG Xiaoman¹, REN Hao¹(), YANG Yuxuan¹()

1. State Grid Sichuan Economic Research Institute, Chengdu 610041, China
2. State Grid Sichuan Electric Power Research Institute, Chengdu 610041, China

Received:2021-08-17 Revised:2021-12-12 Online:2022-01-25 Published:2022-02-15

摘要/Abstract

摘要：

中性点经小电阻接地的配电网发生高阻接地故障,因故障电流微弱,传统过流保护装置容易拒动,而已有的高阻接地故障检测算法因复杂的故障特征应用受到一定限制。分析高阻接地故障电流特征发现,线路零序电流存在谐波特性且与变压器中性点零序电流大小成正比的特征,据此提出综合零序电流谐波算法的比率制动保护。其原理是整定值根据中性点零序电流大小和线路零序电流三次谐波进行自适应调整; 进一步设定保护判据及整定值,建立高阻接地故障模型。在典型小电阻接地配电网中对各种算法进行仿真测试,并对各种算法进行对比,仿真结果验证综合谐波算法的高阻比率制动保护兼顾了可靠性和灵敏性。

关键词: 小电阻接地配电网, 高阻接地故障, 谐波算法, 比率制动保护, 零序电流

Abstract:

The power system with neutral grounding via low resistance is prone to high impedance grounding faults （HIFs） which are difficult to be detected by traditional over-current protection devices due to the limited fault current values. The existing HIF detection algorithms are limited by complex fault characteristics. Analysing the characteristics of HIF current, zero‐sequence current is of harmonic characteristics and proportional to neutral point zero‐sequence current. Accordingly, the zero‐sequence current ratio restraint protection based on harmonic algorithm is proposed. The principle of the algorithm is that the setting value adaptively adjusts with zero-sequence current and the third harmonic of line zero-sequence current. A HIF model is established based on the adjusted protection criteria and setting values. Taking a typical low resistance grounding system as an example, various algorithms are simulated and compared. Simulation results verify the reliability and sensitivity of the zero‐sequence current ratio restraint protection based on harmonic algorithm.

Key words: low resistance grounding system, high impedance fault（HIF）, harmonic algorithm, ratio restraint protection, zero-sequence current

中图分类号:

TM772

倪江, 孙昕炜, 熊晓曼, 任昊, 杨宇玄. 综合谐波算法的小电阻接地配电网高阻比率制动保护[J]. 综合智慧能源, 2022, 44(1): 80-86.

NI Jiang, SUN Xinwei, XIONG Xiaoman, REN Hao, YANG Yuxuan. Ratio restraint protection for high impedance grounding faults in low resistance grounding system based on harmonic algorithm[J]. Integrated Intelligent Energy, 2022, 44(1): 80-86.

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参考文献 21

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介质	电流/A
潮湿沙地	15
干燥草皮	20
干燥草地	25
潮湿草皮	40
潮湿草地	50
钢筋混凝土	75

线路	项目	电阻/ （Ω·km^-1）	感抗/ （Ω·km^-1）	电导率/(µS·km^-1）
架空线	正序	0.017	0.310	3.030
架空线	零序	0.320	1.100	1.380
电缆	正序	0.030	0.270	60.560
电缆	零序	0.880	0.990	28.260

故障类型	R_f/Ω	3I₀₁/A	3I₀₃/A	3I_0N/A	U_0N/V	传统零序	谐波算法	电压比率制动	本文算法
a	0	579.0	0.0	546.0	5 462.0	正常动作	正常动作	正常动作	正常动作
b	100	36.4	5.5	34.4	343.5	拒动	正常动作	正常动作	正常动作
b	500	6.7	1.5	6.3	63.4	拒动	正常动作	正常动作	正常动作
b	1 000	3.4	0.8	3.2	32.0	拒动	正常动作	灵敏度低	正常动作
c	100	53.6	0.0	50.5	505.5	拒动	拒动	正常动作	正常动作
c	500	11.5	0.0	10.9	108.8	拒动	拒动	正常动作	正常动作
c	1 000	5.8	0.0	5.5	54.9	拒动	拒动	正常动作	正常动作
d	0	14.1	0.0	472	4 715.0	不误动	不误动	不误动	不误动

综合谐波算法的小电阻接地配电网高阻比率制动保护

Ratio restraint protection for high impedance grounding faults in low resistance grounding system based on harmonic algorithm

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