Influence of Voltage Stabilizer on DC Conductivity and Space Charge Characteristics in XLPE for HVDC Cable Application

摘要

In this paper, the voltage stabilizers that have excellent compatibility with XLPE are used to suppress the space charge in XLPE insulation. Three different voltage stabilizers, 4,4'-Difluorobenzophenone, 4,4'-Dihydroxybenzophenone, and 4,4'-Bis (dimethyl amino) benzyl, denoted as A, B, and C, respectively, were added into XLPE material with additive content of 0.5 wt%, and neat XLPE was used as a control. The DC conductivity and breakdown strength measurements were employed to characterize the electrical properties of the samples. Moreover, the space charge behaviors were investigated using the PEA method. Though the influence of voltage stabilizers on DC conductivity is not obvious, a higher breakdown strength was found in the voltage-stabilizer modified XLPE samples. In addition, XLPEs modified by the voltage stabilizers B and C show a good ability to suppress space charge in XLPE insulation, that is, less space charge accumulation and faster space charge dissipation than the neat XLPE. The experimental results reveal that the voltage stabilizers B and C show great promise for use in HVDC cable application.