摘要
针对当前常规铁路电源屏中电流互感器时常发生饱和导致继电保护误动的问题,提出铁路电源屏中电流互感器饱和特性及建模技术研究。在暂态方程的基础上,推导出变压器等效电路,计算短路电流幅值,得出微分方程,分析电流互感器饱和特性,研究抗饱和算法,完成磁化曲线拟合,建立可饱和电流互感器模型。设计仿真实验,验证该模型有效性,实验结果表明,所设计模型的二次电流与一次电流的曲线吻合程度较高,表明其有效防止了电流互感器饱和而导致继电保护误动的情况发生,证实该模型有效。
Aiming at the problem that the current transformer in the conventional railway power supply screen is often saturated,which leads to the misoperation of relay protection,A study on the saturation characteristics and modeling technology of the current transformer is proposed in the railway power supply screen.On the basis of the transient equation,the transformer equivalent circuit is deduced,the short-circuit current amplitude is calculated,the differential equation is obtained,the saturation characteristics of the current transformer are analyzed,the anti-saturation algorithm is studied,the magnetization curve fitting is completed,and the saturable current transformer model is established.Simulation experiment is designed to verify the validity of the model.The experimental results show that the curve of secondary current and primary current of the designed model are in good agreement,which indicate that the model can effectively prevent the misoperation of relay protection due to saturation of current transformer.Therefore,the model can be verified to be effective.
作者
张治国
王茹玉
申楠
ZHANG Zhiguo;WANG Ruyu;SHEN Nan(Xi’an Traffic Enginering Institute,Xi’an 710300,China)
出处
《自动化与仪器仪表》
2020年第8期37-40,共4页
Automation & Instrumentation
基金
陕西省高等教育学会“马斯洛层次需要理论对高等教育人才培养的影响及应用研究”(No.XGH17248)。
关键词
铁路电源屏
电流互感器
饱和特性
建模技术
railway power supply panel
current transformer
saturation characteristics
modeling techniques
