Space change behavior in full scale �250 kV dc XLPE cables

Abstract

Space charge in full size ±250 kV dc cables was measured using a pulse‐electroacoustic method. Two newly developed types of dc XLPE cables with 20 mm thick insulation were subjected to measurements at a dc voltage of 500 kV, keeping the conductor temperature either at room temperature or at 85°C. Qualitative analyses of the space charge distribution and the quantitative analysis of the electric fields in the vicinity of semicon interfaces were made. It was shown that the field in the vicinity of the inner semiconductor tends to increase by 10 to 40% when the polarity of the applied voltage was switched, in the case when the conductor was kept at 85°C. However, the distortion of the electric field was significantly smaller than that expected with conventional XLPE cables. As a result, dc cables are considered to have stable dc characteristics from the viewpoint of space charge behavior. © 1998 Scripta Technica, Electr Eng Jpn, 124(2): 16–28, 1998

Space Charge Measurement Technologies and Their Potential Applications

“…For the PEA method, deconvolution was introduced for signal calibration in a cylindrical cable geometry, (44) and a flat electrode system was used for the measurement of space charge in the insulation of coaxial cables with insulation thickness up to the order of 20 mm. (45)(46)(47)(48) The method was also used to study the aging of an extruded cable under DC voltage application for up to 3 years. (49,50) With the development of the techniques and the needs of industry, the pressure wave methods, especially the pulsed electroacoustic method, have been presented in a Conseil International des Grands Réseaux Électriques (CIGRE) task force report and converted into an International Electrotechnical Commission (IEC) standard.…”

Effect of CNFs-Ni/LDPE electrode on space charge injection in LDPE insulating layer

“…The semiconductive shielding layer of high-voltage DC cable with excellent performance can effectively inhibit the injection of carriers from the metal core to the insulating layer. Some research shows that the semi conductive shielding layer with good performance can reduce the accumulation of space charge in the insulating layer [8] . Space charge accumulation is generally considered to be the main factor to accelerate the deterioration of polymer insulation under HVDC transmission conditions.…”