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A Design Method for Stress Cone of High Voltage DC Cable Intermediate Joint

A technology of cable intermediate joints and design methods, which is applied in the direction of cable accessories, cable installation, electrical components, etc., can solve the problems related to electrical conductivity and achieve the effect of uniform distribution of tangential field strength

Active Publication Date: 2019-03-12
GLOBAL ENERGY INTERCONNECTION RES INST CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existing stress cone design follows the design method of the AC cable stress cone, focusing on the dielectric constant of the material, without considering that the electric field distribution of the accessories in the DC cable is mainly related to the conductivity of the two materials

Method used

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  • A Design Method for Stress Cone of High Voltage DC Cable Intermediate Joint
  • A Design Method for Stress Cone of High Voltage DC Cable Intermediate Joint
  • A Design Method for Stress Cone of High Voltage DC Cable Intermediate Joint

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Embodiment Construction

[0036] Embodiments of the present invention are described in detail below in conjunction with accompanying drawings:

[0037] attached figure 2 It is a schematic diagram of the overall prefabricated accessory structure. The intermediate joint is reinforced insulation shield 5, reinforced insulation 2, and cable insulation layer 6 from outside to inside; the connection between cables is stripped of cable insulation shield 8 and cable insulation layer 6 The cable conductor 7 is fixed by the connecting fitting 4, and the outside of the connecting fitting 4 is covered with a high-voltage shielding tube 3; the stress cone semi-conducting part 1 in the accessory is located in the reinforced insulation 2.

[0038] The material used for the reinforced insulation 2 is silicone rubber (SIR), and the material used for the cable insulation layer 6 is cross-linked polyethylene (XLPE).

[0039] attached figure 1 It is a diagram illustrating the principle of the design method, and the pre...

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Abstract

The invention provides a design method of a high-voltage DC cable intermediate joint stress cone. The method comprises the following steps: 1, determining the shielding radius a of a cable conductor, the outer-side radius b of cable insulation layer crosslinking polyethylene, resistance R1 of the cable insulation layer crosslinking polyethylene and resistance R2 of enhanced insulation silicone rubber; 2, calculating a ratio of electric potential of a P point at an interface between the insulation material of a cable insulation layer and the insulation material of enhanced insulation to conductor electric potential; and 3, calculating a vertical distance from the end portion of the stress cone to the root portion of the stress cone. According to the technical scheme provided by the invention, the tangential field intensity of the interface between the insulation materials is uniformly distributed according to conductivity of insulation materials of different high-voltage DC cable accessories.

Description

technical field [0001] The invention relates to the design field of cross-linked polyethylene high-voltage direct-current cable accessories, in particular to a design method for a stress cone of an intermediate joint of a high-voltage direct-current cable. Background technique [0002] The transmission lines of HVDC technology generally use plastic cables with polymer insulation. Cross-linked polyethylene (XLPE) has become the first choice for DC cable insulation materials due to its superior performance and successful application in high-voltage AC cables. [0003] High-voltage DC cables usually need to be connected with connector accessories, and the insulation shield is stripped when connecting, so that the electrical stress line at the shield end is concentrated, so it is necessary to use a device stress cone in the accessory to relieve stress. Placed stress cones increase the conductor-to-shield distance, spread out power lines and add extra insulation in high voltage ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02G15/105
CPCH02G15/105
Inventor 尚康良曹均正韩正一王海田
Owner GLOBAL ENERGY INTERCONNECTION RES INST CO LTD
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