In order to analyze the influence of space charge distribution in the main insulation and reinforced insulation on the maximum field strength in the high voltage DC cable terminal

the space charge distribution in the double-layer dielectric and its interface of cross-linked polyethylene and non-linear silicone rubber is measured by electro-acoustic pulse method. According to the interfacial space charge distribution characteristics

and by means of the space charge packet parameters

the maximum field strength in the high voltage DC cable terminal is analyzed by COMSOL Multiphysics simulation software. It is found that the electric field distribution in the high-voltage DC cable terminal is affected by the interfacial space charge and the space charge distribution in cross-linked polyethylene and nonlinear silicone rubber.When the peak value of the i

nterface space charge is less than 2 C/m

3

the effect of space charge on the electric field distribution in the cable termination is not obvious. When the peak value is greater than 2 C/m

3

the wider the space charge distribution in the insulation layer

the larger the maximum field strength in the cable terminal.