基于感应电的线路工频参数测量方法研究  

A method for Transmission Lines Parameters Measuring based on Induced Voltage and Current

作　　者：付慧[1,2] 陶风波[3] 周志成[3] 魏旭[2] 

机构地区：[1]华北电力大学,北京102206 [2]江苏省电力公司,江苏南京210024 [3]江苏省电力公司电力科学研究院,江苏南京211103

出　　处：《江苏电机工程》2013年第5期15-18,共4页Jiangsu Electrical Engineering

摘　　要：输电线路工频参数是系统潮流和保护整定值的计算依据,对于合理安排电网运行方式,提高继电保护动作的可靠性、灵敏性至关重要。提出通过测量线路感应电压及电流,并基于序分解理论,对线路工频参数进行测量的方法。同时应用该方法对某变电站同杆四回线路参数进行实测,与传统法测得的工频参数相比,该方法所得结果误差较小,能够满足测量要求。分析了电压幅值分散性对于测量结果的影响,结果表明较大的外施电压幅值分散性可以减小零序阻抗的测量误差。Parameters of the power transmission line are the base of power system load flow calculation as well as protection value setting. Acquiring accurate values of the parameters are important for power system operation arrangement and relay protection＇s reliability and sensitivity improvement. A method is proposed to calculate the sequence parameters of transmission lines based on the decomposition of the induced voltage （current） into positive, negative and zero sequence. The proposed method and traditional method are applied to calculate the sequence impedance of 4 transmission lines on a same tower. The comparison of these two results shows that the two methods have almost same accuracy which means the proposed is qualified for measuring. The effect of voltage amplitude dispersion on the measuring results is discussed. It is shown that a larger amplitude dispersion of voltage indicates a smaller measuring error of the zero sequence impedance.

关 键 词：同杆多回线路 感应电压 线路工频参数 序分解 

分 类 号：TM726[电气工程—电力系统及自动化]