Effect of Nonlinear Properties of Stress Cone Reinforced Insulation on Electric Field Distribution of HVDC Cable Terminal

doi:10.11985/2018.11.005

Abstract

Abstract:

The steady-state electric field distribution in HVDC cables and accessories mainly depends on the conductivity of insulating materials, and the conductivity is closely related with the electric field and temperature. So the electric field distribution of HVDC cable accessories is more complex than the electric field distribution of HVAC cable accessories. In this paper, the influence of nonlinear properties of stress cone reinforced insulation on the steady-state electric field distribution of outdoor compound terminal of HVDC cable is studied using COMSOL Multiphysics software, and under the conditions in which the XLPE insulation conductivity, silicone oil conductivity and the temperature gradient in the cable terminal are fixed. The simulation results show that: the tangential electric field at the interface between the factory insulation and the reinforced insulation in the compound outdoor HVDC cable terminal will show the maximum field at the root and top of the stress cone, and the electric field of the inner surface of the semicon stress cone may also appear the maximum field at the root and the top. The comprehensive regulation of electric field distribution of compound HVDC cable terminal can be realized by adjusting the nonlinear properties of the stress cone reinforced insulation.

Key words: HVDC cable terminal, stress-cone reinforced insulation, nonlinear properties of materials, electric field distribution

CLC Number:

TM247

Li Zhonghua,Zhang Xia. Effect of Nonlinear Properties of Stress Cone Reinforced Insulation on Electric Field Distribution of HVDC Cable Terminal[J]. Journal of Electrical Engineering, 2018, 13(11): 37-43.

Figures/Tables 9

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材料	A/[V/(Ω·m²)]	B/(m/V)	?/(eV)	ε_r
XLPE	28.80	7.10×10-8	0.52	2.3
硅油	2.22	2.32×10-7	0.40	1.7

材料	热导率/[W·(m·K)^-1]	热熔/[J·(kg·K)^-1]	密度/(kg·m^-3)
增强绝缘	0.25	1 700	1 180
XLPE	0.29	2 250	922
硅油	0.14	1 630	960
玻璃钢	0.33	700	2 200
绝缘子	0.20	1 300	1 250