Research on Key Influencing Factors of Ferroresonance Fault in Ineffective Grounding System

doi:10.11985/2020.02.009

Abstract

Abstract:

Ferromagnetic resonance faults frequently occur in low current grounding system in recent years, which seriously affects the safe operation of power equipment and system. In view of the shortcomings that the current ferromagnetic resonance faults are mostly confined to post-treatment, the conditions of Ferromagnetic resonance and its influencing factors are quantitatively compared in order to determine the key influencing factors. Firstly, the factors affecting ferroresonance faults and their mechanism are analyzed, and the fault tree model of ferroresonance is constructed to determine the logical sequence of the factors. Secondly, the sensitivity index is constructed to quantify the extent of the factors, and the key factors are determined based on Petri network. Finally, the Changji distribution network in Xinjiang is taken as an example to study and determine the critical factors. The results show that the neutral point parameter of transformer has the greatest influence on ferroresonance overvoltage fault, and the neutral point DC resistance of transformer takes the second place. Both of them are the fundamental factors affecting ferroresonance fault. The research results have important theoretical reference for the prevention and control of ferroresonance over-voltage fault.

Key words: Ferroresonance, critical factors, Petri net, sensitivity

CLC Number:

TM714

HE Long, MA Jincai, DU Longji, LI Jun, WU Weili, LIU Yong. Research on Key Influencing Factors of Ferroresonance Fault in Ineffective Grounding System[J]. Journal of Electrical Engineering, 2020, 15(2): 61-69.

Figures/Tables 11

References 17

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故障树规则	Petri网络推演算法
逻辑或:$M=\text{ }{{x}_{1}}+{{x}_{2}}$	$M=\text{ max}\{{{x}_{1}}\times {{c}_{1}},\ x{}_{2}\times {{c}_{2}}\}$
逻辑与:$M={{x}_{1}}\cdot {{x}_{2}}$	$M=\text{min}\{{{x}_{1}},\ {{x}_{2}}\}\times c$

参数	数值
电流 I/mA	0.285	0.465	0.771	1.137	1.863	2.697	4.329	6.516	8.335
磁通 Φ/Wb	29.39	81.58	116.81	123.72	135.96	140.62	143.32	151.45	165.26

影响因素	实际状况
激发类型	单相短路故障、相间短路、误操作、外部过电压
互感器类型	电磁式(三相五柱式、单柱式),电容式(单柱式)
故障消除时刻	随机
中性点电阻	0~1 000 kΩ
线路构成	电缆线路比例10%~70%
过渡电阻	金属接地
消弧线圈	过补偿、欠补偿和正常补偿
补偿电容	有、无补偿电容
铁心励磁特性	不同厂家励磁特性不同
互感器高压侧电阻	0~80 Ω

推理过程	影响因素
$varrho^1$	0.01	0	0	0.03	0.02	0.40	0.6	0.8	0.5	0.06	0.5	0.06	0
$varrho^2$	0.01	0	0.01	0.02	0.02	0.30	0.6	0.8	0.5	0.06	0.5	0.06	0
$varrho^3$	0.001	0.03	0.01	0.03	0.02	0.30	0.8	0.7	0.5	0.06	0.5	0.06	0
$varrho^4$	0.003	0.03	0.01	0.02	0.02	0.30	0.7	0.8	0.5	0.06	0.5	0.06	0.001
$varrho^5$	0.003	0.03	0.01	0.02	0.02	0.30	0.7	0.8	0.5	0.06	0.5	0.06	0.001