Monitoring of transmission lines

The invention relates to a system comprising a coupling device (210) and a data processing device (218) which is designed to provide an excitation signal (SE) such that an internal signal (phi) having a deformation caused by a current (I0) to be measured occurs in the coupling device (210); obtaining a measurement signal (Sm) for a variable (Vm), the signal (Sm) of the variable (Vm) being sensitive to the deformation; providing a compensation signal (Sc) to counteract the deformation; and evaluating the current (I0) to be measured according to the compensation signal (Sc). The data processing device (218) is further designed to evaluate the measurement signal (Sm) and to detect a fault on the transmission line (118) on the basis of the evaluation. 本发明涉及一种系统包括：耦合设备(210)和数据处理设备(218)，该数据处理设备(218)被设计为：提供激励信号(SE)，使得在耦合设备(210)中出现内部信号(Φ)，该内部信号(Φ)具有由待测量电流(I0)所引起的变形；获得用于变量(Vm)的测量信号(Sm)，该变量(Vm)的信号(Sm)对变形是敏感的；提供补偿信号(Sc)以抵消变形；以及，跟据补偿信号(Sc)评估待测量电流(I0)。该数据处理设备(218)还被设计为分析测量信号(Sm)，并且根据该分析检测传输线路(118)上的故障。