小电流接地系统铁磁谐振过电压关键影响因素辨识*

doi:10.11985/2020.02.009

电气工程学报 ›› 2020, Vol. 15 ›› Issue (2): 61-69.doi: 10.11985/2020.02.009

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小电流接地系统铁磁谐振过电压关键影响因素辨识^*

何龙¹(),马金财¹,杜龙基¹,李军¹,吴伟丽²(),刘勇^3,⁴

1.国网新疆电力有限公司昌吉供电公司昌吉 831100;
2.西安科技大学电气与控制工程学院西安 710054;
3.安徽正广电电力技术有限公司合肥 230000;
4.大连理工大学电子信息与电气工程学部大连 116024

收稿日期:2020-03-30 出版日期:2020-06-25 发布日期:2020-07-31
通讯作者: 吴伟丽 E-mail:helong69@126.com;wwllxm@163.com
作者简介:何龙,男,1988年生,硕士,工程师。主要研究方向为电气设备故障诊断与在线监测。E-mail:helong69@126.com
基金资助:
* 国网新疆电力有限公司科技资助项目(XJ2019000409)

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

HE Long¹(),MA Jincai¹,DU Longji¹,LI Jun¹,WU Weili²(),LIU Yong^3,⁴

1. Changji Power Supply Company of State Grid Xinjiang Electric Power Co., Ltd., Changji 831100 China;
2. School of Electrical and Control Engineering, Xi’an University of Science & Technology, Xi’an 710054 China;
3. Anhui Zhengguang Electric Power Technology Co., Ltd., Hefei 230000 China;
4. Faculty of Electronic Information and Electrical Engineering, Dalian University of Technology, Dalian 116024 China

Received:2020-03-30 Online:2020-06-25 Published:2020-07-31
Contact: WU Weili E-mail:helong69@126.com;wwllxm@163.com

摘要/Abstract

摘要：

近年来铁磁谐振故障在小电流接地系统频繁发生,严重影响到电力设备和系统的安全运行。针对目前对铁磁谐振故障多局限于事后治理的不足,对铁磁谐振产生条件及其影响因素的作用程度进行量化对比,以确定造成铁磁谐振的关键影响因素。首先,对影响铁磁谐振故障的各因素及其作用机理进行分析,构建铁磁谐振事故树模型,确定各因素作用逻辑顺序。其次,构建灵敏度指标,量化各因素的作用程度,基于Petri网络确定关键影响因素。最后,以新疆昌吉配电网为例,对比和研究多种工况下的铁磁谐振各影响因素的作用程度。结果表明,变压器中性点参数对铁磁谐振过电压故障的影响最大,互感器中性点直流电阻的作用次之,二者均为影响铁磁谐振故障的关键因素。研究成果对预防和治理铁磁谐振过电压故障具有重要的理论参考意义。

关键词: 铁磁谐振, 影响因素, Petri网, 灵敏度

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

中图分类号:

TM714

何龙, 马金财, 杜龙基, 李军, 吴伟丽, 刘勇. 小电流接地系统铁磁谐振过电压关键影响因素辨识^*[J]. 电气工程学报, 2020, 15(2): 61-69.

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.

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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

小电流接地系统铁磁谐振过电压关键影响因素辨识^*

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

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