摘要
针对系统单相接地故障对接地变压器运行状态在线检测影响较大的问题,计算分析系统单相接地故障对接地变压器输入有功功率、无功功率及高压侧功率因数的影响因素及变化规律,并参照实际配电网结构建立配电网模型进行仿真分析,仿真结果和实际故障记录数据验证了计算分析所得结论的正确性。结果表明,当系统发生单相接地故障且长时间带故障运行时,接地变压器输入的无功和有功功率均增大后保持恒定,有功功率比无功功率变化小,功率因数角减小;接地变压器输入的无功和有功功率大小与失谐度大小呈正相关性,与接地点的过渡电阻大小呈负相关性;其中,无功功率受过渡电阻及失谐度影响更为明显,所得结论可为其运行状态在线检测技术研究奠定基础。
Aiming at the problem that the single-phase grounding fault of the system has a great influence on the on-line detection of the operation state of the grounding transformer, this paper calculates and analyzes the influencing factors and variation rules of the input active power, reactive power and high-voltage side power factor of the grounding transformer, and establishes the distribution network model with reference to the actual distribution network structure for simulation analysis. The simulation results and the actual fault record data verify the correctness of the conclusions obtained from the calculation and analysis. The results show that when the system has single-phase grounding fault and operates with fault for a long time, the input reactive power and active power of the grounding transformer increase and remain constant, the change of active power is smaller than that of reactive power, and the power factor angle decreases. The input reactive and active power of the grounding transformer has a positive correlation with the degree of detuning, and a negative correlation with the transition resistance of the grounding point. Among them, the reactive power is more obviously affected by the transition resistance and detuning degree. The conclusion can lay a foundation for the research on the online detection technology of its operating state.
作者
咸日常
陈蕾
郑春旭
张冰倩
高鸿鹏
范慧芳
XIAN Ri-chang;CHEN Lei;ZHENG Chun-xu;ZHANG Bing-qian;GAO Hong-peng;FAN Hui-fang(School of Electrical and Electronic Engineering,Shandong University of Technology,Zibo 255000,China;State Grid Shandong Electric Power Company Zibo Power Supply Company,Zibo 255000,China)
出处
《电机与控制学报》
EI
CSCD
北大核心
2022年第6期134-141,共8页
Electric Machines and Control
基金
国家“十三五”重点研发计划(2016YFB0901303)。
关键词
单相接地
接地变压器
过渡电阻
失谐度
无功功率
有功功率
功率因数
single-phase grounding
grounding transformer
transition resistance
detuning
reactive power
active power
power factor
