Abstract
The demand for internal nondestructive testing and inspection techniques is rapidly increasing. Using a continuous wave (CW) terahertz (THz) imaging system, we demonstrate that the internal defects in cross-linked polyethylene (XLPE) plates for power cable insulation can be detected. In a coherent detection scheme based on photomixers, which serve as the THz emitters and receivers, the change of phase occurring with the defects inside the XLPE plates is distinctly measured by the change in the amplitude of the transmitted THz waves. According to the two-dimensional images of THz waves transmitted through the XLPE plates, defects of up to 0.5 mm size located inside the XLPE plates can be detected by the internal nondestructive examination method based on CW–THz waves. This technique will be useful for internal nondestructive testing and inspection of insulation materials that require high resolution in various industries, including the automobiles, electronics, and electrical power industries.
Highlights
An electrical power system is generally considered as a large network that connects power plants to customers; it consists of electricity generators and electrical power transmission and distribution networks
We have demonstrated that artificial void defects located inside XLPE plates for power cable
We have demonstrated that artificial void defects located inside XLPE plates for power cable insulation can be detected using a CW–THz imaging system
Summary
An electrical power system is generally considered as a large network that connects power plants to customers; it consists of electricity generators and electrical power transmission and distribution networks. Cross-linked polyethylene (XLPE), which is a form of polyethylene with crosslinks, is widely used as an insulation material because of its excellent advantages, including high resistance against weather, moisture, and temperature, high mechanical strength, and remarkable electrical properties [1,2]. All dielectrics, including XLPE, undergo several alterations in their physical or chemical properties as a result of internal or external environmental factors, e.g., mechanical constraints, humidity, temperature, and partial discharges. It is important to study the influence of defects on the aging phenomenon and the degradation of the insulating performance. The partial discharges induced by defects in the XLPE insulation usually reduce insulation performance in the long term and can act as a factor that further impedes the stability and safety of the overall electric power system
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
