摘要
中性点经小电阻接地系统接地故障电流较大,电弧接地时易形成稳定弧光,有必要建模并定量计算对应故障特征。传统方法通过引入电弧黑盒模型求解各时刻电弧电导,实时计算量大且不易定量得出可被继电保护利用的故障特征。针对该问题,结合电弧黑盒模型研究基础与复奇频电压源串联电弧等效模型,建立小电阻接地系统弧光接地故障等值分析电路,给出对应故障特征计算方法与各出线、中性点零序电流解析表达式,分析小电阻接地系统弧光接地故障特征。通过仿真计算验证所提建模与计算方法的有效性,相关特征可为后续弧光接地保护算法研究提供支撑。
The neutral point is grounded with a low resistance.The ground fault current is large,and it is easy to form a stable arc when the arc is grounded.It is necessary to model and quantitatively calculate the corresponding fault characteristics.The traditional method introduces the arc black box model to solve the arc conductance at each time.The real-time calculation is large and it is not easy to quantify the fault characteristics that can be used by the relay protection.In response to this problem,combining the research basis of the arc black box model and the equivalent model of the complex odd-frequency voltage source series arc,an equivalent analysis circuit for arc-to-ground faults in the low-resistance grounding system is established.The calculation method of the corresponding fault characteristics and the analytical expressions of the zero sequence current of each outgoing line and neutral point are given,and the characteristics of the arc ground fault in the low resistance grounding system are analyzed.The effectiveness of the proposed modeling and calculation method is verified by simulation calculation.The relevant features can provide support for subsequent arc grounding protection algorithm research.
作者
李响
张炜祺
赵瑞锋
欧阳卫年
梁永亮
LI Xiang;ZHANG Weiqi;ZHAO Ruifeng;OUYANG Weinian;LIANG Yongliang(Foshan Power Supply Bureau of Guangdong Power Grid Co.,Ltd.,Foshan 528000,China;College of Electric Engineering,Shandong University,Jinan 250061,China)
出处
《供用电》
2022年第6期27-32,39,共7页
Distribution & Utilization
基金
国家自然科学基金项目(52077221)
中国南方电网有限责任公司科技项目(030600 K K 52190184GDKJXM20198132)。
关键词
小电阻接地系统
电弧模型
接地故障
等值电路
特征计算
low resistance grounding system
arc model
ground fault
equivalent circuit
feature calculation
