A Study on the Behavior of Interfacial Space Charge at Polymer Dielectric Double-Layer Simulating the HVDC Cable Joints

In this study, the characteristics of the space charge at the interface inside the cable joints known as the weak part of the HVDC cable were experimentally identified. For the experiment, a double-layer sample was made of two types of polymer and after applying a DC voltage, the space charge at the interface was measured and analyzed. The polarity of the space charge formed at the interface was consistent with the Maxwell-Wagner model. The time dependence of space charge accumulation and disappearance will be further studied through additional experiments and analysis in the future.