一种耦合传输线参数在线测量方法

摘要

Some lines parameter online measurement methods have the shortcoming of being unable to measure the ground capacitance and coupling capacitors. In order to solve this problem, considering the effects of electromagnetic coupling between transmission lines, an exact three-parallel-wire-to-earth model is put forward based on the uniform transmission line equation, using the synchronous data of both ends of transmission line to derive the parameter calculating formulas. The digital simulation via Matlab verifies the correctness of the theory. A novel principle and calculating method of parameter online measurement is presented for coupling transmission lines, and makes a further discussion of the application in transmission lines zero sequence parameter measurement, which provides a theoretical basis for transmission lines zero sequence parameter online measurement.%国内一些线路参数的在线测量方法存在着无法对耦合传输线的对地电容和耦合电容进行测量的缺点.为了解决这一问题,全面考虑了传输线之间的电磁耦合作用,建立了准确的三线一地耦合传输线的数学模型,以均匀传输方程为理论依据,通过严格的数学推导得出了基于双端同步信息的耦合传输线参数在线测量的计算公式.利用Matlab对研究的方法进行数字仿真,结果表明该方法可行,从而提出了一种新的耦合传输线参数的在线测量的原理和计算方法,进一步讨论该理论在输电线路零序参数测量中的应用,为输电线路零序参数的在线测量计算提供了理论依据.