A method for eccentricity detection of multicore cables based on array eddy current sensors

Purpose Cable eccentricity not only causes electric field distortion and insulation layer aging, leading to a decline in cable performance, but also seriously threatens the safe operation of power systems. However, existing detection methods have problems such as insufficient accuracy or poor environmental adaptability. This study aims to present a cable eccentricity detection method based on an array eddy current sensor (ECS) for measuring the eccentricity of power cables. Design/methodology/approach Firstly, by designing an array model, the calculation formulas for the array ECS to detect cable eccentricity and eccentric angle were analyzed and derived. Secondly, a finite element simulation model of the sensor and multicore cable was established, and the coupling relationship between the sensor and the cable under scenarios with different numbers of array sensors was discussed, further verifying the feasibility of this method. Finally, static and dynamic measurement experiments on multicore cables were carried out using a cable eccentricity detection device. Findings The experimental results show that within the eccentricity range of 0–3.4 mm, the calculation error of eccentricity is within ±3% and the error of eccentric angle is within ±5%, which meets the accuracy requirements. Originality/value The designed array ECS can realize the measurement of cable eccentricity and offset angle, and has certain research significance.