提出了一种基于积分方程的T接线输电线路零序参数带电测量新方法,给出了该方法的数学模型,列写出T接线输电线路积分方程组的离散表达式,并利用最小二乘方法求解其零序阻抗参数.为获得足够多的独立方程,给出T接线线路在带电测量时的6种运行方式.获取测量源与利用全球定位系统(GPS)作为异地测量的同步信号是2个关键技术.给出了T接线输电线路零序参数带电测量系统的硬件结构.利用Matlab进行了数字仿真,给出了利用所提方法测量一个T接线线圈参数的测量结果,并与模拟测试结果进行了对比.数字仿真和测试结果表明所提出的基于积分方程的T接线输电线路零序参数带电测量方法是可行的,测量结果准确,完全能满足工程测量要求.%A live line measurement based on the integral equations is proposed for the zero-sequence parameters of T-connection transmission lines. Its mathematical model and the discrete expressions of its integral equations are given. The least squares method is used to calculate its zero-sequence impedance. In order to obtain enough independent equations,6 live line measurement modes are shown. Measurement source acquisition and GPS (Global Positioning System) are the key techniques of synchronous data sampling at different substations. The hardware structure of live line measurement system for the zero-sequence parameters of T-connection transmission lines is given. Results of the simulation with Matlab and the live line parameter measurement of a T-connection coil are given and compared with those by analog measurement method,which show that,the introduced method is feasible to get the correct results,meeting the requirements of engineering measurement.
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