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

doi:10.3969/j.issn.2097-0706.2022.01.011

Abstract

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

CLC Number:

TM772

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.

Figures/Tables 9

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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