A Study on Temperature Control Method and Space Charge Measurement of HVDC Cable Insulation Material using Induction Heating

Recently, there has been an increasing number of social and economic issues related to high-voltage direct current (HVDC) transmission for long-distance power transmission and improved transmission efficiency. As a result, the reliable and durable performance of XLPE (cross-linked polyethylene) or PP (polypropylene) used as insulators in DC transmission cables is required. Additionally, it is important to study the space charge density and behavior characteristics resulting from the heat generated by the conductor inside the cable during transmission. Traditionally, the current transformer (CT) method has been used, but it has disadvantages such as long heating times, difficulty in precise temperature control, and the need for somewhat complex dummy samples. In this study, we investigated a method to satisfy the temperature conditions of the cable conductor more simply, accurately, and quickly than the traditional CT method using an induction heating device.