Review of condition monitoring and defect inspection methods for composited cable terminals

Abstract

Composited cable terminals are critical for reliable power delivery of traditional and traction power supply systems. During its operation, the cable terminal continually undergoes complex circumstances where humidity, temperature, field strength, mechanical stress and other factors continuously change at different levels. In extreme cases, defects or even failures may occur in the cable terminals, leading to catastrophic accidents. This makes the condition monitoring and defect detection of composited cable terminals become an imperative need for the power industry. The “state‐of‐the‐art” technology of cable terminal condition assessment is focussed and a systematic review of the current research progress of cable terminal condition assessment from the operation circumstances to failure mechanisms is provided. It covers both online/offline condition monitoring methods and defects detection approaches. In addition, challenges and future research directions for cable terminal condition assessment are also addressed. It is concluded that the non‐destructive and non‐intrusive methods like terahertz imaging and ultrasonic testing, and multi‐source information fusion methods as well as the digital twin technology have been gaining popularity for cable terminal defect inspection. It is expected the presented work can provide a global field of vision for further advancement of both scholars and industrial engineers in this field.

Research on Fault Diagnosis Algorithm of Power Cable Based on Deep Learning

“…Because the laying distance of the cable is long and the direction is complex, there are many defects in the manual periodic inspection mode, inspection interval and inspection accuracy. The single-chip microcomputer can be used to detect the current of the cable ground wire in real time, arrange multiple measuring points along the cable, connect each measuring point with each measuring point, and conduct joint analysis of multiple measuring points in the entire system [9]. The insulation state of the cable is counted, so that the situation of leakage or insulation decline and the fault can be judged comprehensively.…”

Accelerated thermal ageing on performance of polypropylene‐based semiconducting screen for high voltage direct current cable applications—Effect of antioxidants

“…Hu et al reported that space charged accumulation was enhanced in a PP/thermoplastic polyolefin blends after thermal ageing, and more deep traps were induced, which resulted in a slower charge dissipation rate during discharging [10]. Semiconducting layers are an important part of cable and have been proven to influence charge formation in XLPE insulation [11][12][13]. Therefore, the investigations on the antioxidative stability and thermal ageing effect of the i-PP-based semiconducting screen (SC) are essential but rarely sourced in literature [14].…”

Research on cable fault detection method based on attenuation compensation technology

“…Due to the complex operating environment and installation work conditions of cable lines, local defects may occur, and in severe cases, cable faults may occur, resulting in huge economic losses. Therefore, precise positioning of cable faults or defects is of great significance for maintaining the operation of the power system [1,2].…”