Adaptive positioning current measurement method for multi-conductor system based on linear magnetic sensor array

Abstract

As transmission and distribution networks now span a wider region, the difficulty of monitoring lines and the incidence of faults are both increased, which reduces the stability of the power system. During the troubleshooting procedure, quick problem identification, line selection, and placement are essential, and non-contact current measurement can be quite helpful. Its advantages include the capacity to monitor high-frequency current and line space position, both of which contain a range of fault characteristics, as well as a high-frequency band, compact size, low cost, and simple installation. In this paper, we present an adaptive positioning current measurement method for multi-conductor systems based on a linear magnetic sensor array. The method detects the position shifts of individual conductors when their locations are displaced to varying degrees using a novel conductor positioning calculation algorithm. Besides, it automatically adjusts the measurement matrix to provide precise current measurements. In the simulations, three-phase parallel currents with an amplitude of 100 A are analyzed based on the parameters of a 15-meter cup-type tensile tower. During the different displacements of the three conductors, the new method calculates the conductor displacements and the current in real-time. For all the three conductor positions change with the maximum amplitude of 2 m, the average error of all the conductor position measurements is about 0.1 m, and the root mean square error (RMSE) of the currents drops from 34.18A to 3.72A with correction, which proves the effectiveness of the algorithm.