| Title |
A Research on the Detection of Internal Defects in Solid-insulation Electrical Facilities using Terahertz Waves |
| Authors |
강자윤(Ja-Yoon Kang) ; 문영채(Young-Chae Mun) ; 박지만(Ji-Man Park) ; 전정채(Jeong-Chay Jeon) |
| DOI |
https://doi.org/10.5370/KIEE.2023.72.11.1540 |
| Keywords |
Terahertz wave; XLPE; Epoxy insulation; NDT; Image detection |
| Abstract |
Solid insulators such as XLPE and epoxy are used in extra-high voltage electrical equipment and have excellent resistance and insulation properties. However, if the insulation is destroyed due to long-term use or manufacturing defects, it can lead to a major accident, so abnormal signals can be detected through various online sensors such as UHF, HFCT and diagnostic equipment such as ultrasonic, ultraviolet corona measurement equipment and thermal imaging cameras. Efforts to prevent accidents by detecting them in advance are continuing. However, these diagnostic techniques based on acquisition and analysis of abnormal signals depend on the user's expert knowledge, and in particular, even if abnormal signals for internal defects in the insulator are detected, there are limitations in identifying the exact physical cause or location. In this paper, terahertz waves were applied to detect internal defects in solid insulated electrical equipment as images rather than signals, and the results were described. First, terahertz waves were applied to XLPE power cables, and the mold transformer was cut to a size convenient for testing and a terahertz wave penetration test was also performed. In addition, to confirm the transmission characteristics of waves, terahertz waves were applied to an epoxy plate, a representative insulating material, and the results were analyzed. |