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500kv and above 500kv power cable outdoor terminal

A power cable, outdoor technology, applied in the direction of cable terminals, etc., can solve the problems of difficult control of stress cone material quality, poor aging resistance, high temperature resistance, difficult to control material quality, etc., to achieve excellent process formability, good fluidity, Stable and reliable product performance

Active Publication Date: 2011-12-07
江苏安靠智能输电工程科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] (1) The quality of the material used to make the stress cone is difficult to control. The material of the stress cone is mainly a terpolymer of ethylene, propylene and non-conjugated dienes. Various additives are added during the kneading process, and the formula is complicated It is difficult to control the quality of the material; the viscosity of the material is high, the molding process is poor, and the yield of the stress cone is only about 60%
[0005] (2) The manufacturing process is complicated, and the molding equipment required to process the stress cone has a large pressure, a large volume, and high product manufacturing costs
Because the viscosity of EPDM rubber after plasticization is very high and its fluidity is poor, it needs tens of megabytes of pressure to inject it into the cavity. During the injection process, the cavity and equipment need to withstand very high pressure. Due to the molding mold The volume is very large, and it requires a special large-scale rubber injection machine with a large tonnage and a large mold to perform rubber injection molding, and the materials used must be injected at one time. Therefore, the production of stress cones for outdoor terminals of power cables with 500kV and above requires rubber injection. The tonnage of the machine must reach more than 1,600 tons, and the single injection of glue must reach more than 80 liters to meet the requirements. Such equipment is large in size and high in equipment cost, and the increase in equipment cost causes the entire production cost to be extremely high.
[0006] (3) Due to the high hardness of EPDM rubber, Shore A60~70, the adhesion to the surface of the cable is poor, resulting in difficulty in product installation and an increase in product failure rate, and the air box of EPDM rubber is aging Post-mechanical properties (aging conditions: 135°C±3°C, 7d), compression set ≤ 15-25%, tensile strength change rate ≤ 20-30%, elongation change rate ≤ 20-30%, material The aging resistance and high temperature resistance are poor, and the product must be operated under the environmental conditions of ≤100°C, the use is limited, and the scope of application is narrow
[0007] Although the existing 500kV and above 500kV power cable outdoor terminals have the above defects, people have been unable to solve this technical problem for a long time

Method used

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  • 500kv and above 500kv power cable outdoor terminal
  • 500kv and above 500kv power cable outdoor terminal
  • 500kv and above 500kv power cable outdoor terminal

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Such as figure 1 As shown, an outdoor terminal for power cables of 500kV and above includes a bushing 1, an insulating agent 2, a stress cone 3, an epoxy sleeve 4 and a spring compression mechanism 5, and also includes an outlet fitting 6 and an upper cover plate 7 , the lower bottom plate 8 and the tail pipe 9, the stress cone 3 is composed of a conductor 3-1 and an insulator 3-2, and the insulating agent 2 is insulating oil. The stress cone 3 is installed in the casing 1, and the epoxy sleeve 4 is placed on the outside of the stress cone 3. The casing 1 is filled with insulating oil, and the spring compression mechanism 5 connected with the tail pipe 9 is arranged under the stress cone 3. The tightening mechanism 5 includes a spring 5-1 and a spring seat 5-2. The spring 5-1 is arranged between the stress cone 8 and the spring seat 5-2. The stress cone 3 is made of liquid silicone rubber.

Embodiment 2

[0024] Such as figure 1 As shown, it is basically the same as the first embodiment, except that the insulating agent 2 is insulating gas, and the bushing 1 is filled with insulating gas.

[0025] Such as figure 2 As shown, when the stress cone 3 of the present invention is made, a two-component glue injection machine for liquid silicone rubber is used. The tonnage of the glue injection machine required is 100 tons. The two-component liquid silicone rubber material of component B and component B is placed in the two rubber barrels 24 of the injection machine, and the material is injected into the material tube 27 through the injection pump 26 on the injection frame 25, and the material is mixed. After being mixed with the mold 28, it is injected into the mold cavity in the mold 29, and the mold 29 is locked by a clamping mechanism 30, and finally the mold 29 is heated and vulcanized to form the stress cone 1.

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Abstract

The invention relates to a cable accessory in the field of power cable transmission systems, in particular to a 500kV and more power cable outdoor terminal. The terminal comprises a sleeve (1), an insulating agent (2), a stress cone (3), an epoxy sleeve (4) and a spring compression mechanism (5) and further comprises outlet hardware (6), an upper cover board (7), a lower bottom plate (8) and a tail pipe (9). The stress cone (3) is arranged in the sleeve (1). The epoxy sleeve (4) is sleeved outside the stress cone (3). The spring compression mechanism (5) is arranged under the stress cone (3).The stress cone (3) is made of liquid silicon rubber. The terminal disclosed by the invention has the advantages of has steady and reliable performance, high yield, low integrated cost; simple manufacture process, easiness manufacture and low manufacture cost; and more excellent process mouldability and low required forming pressure because before the liquid silicon rubber has lower viscosity andbetter liquidity being vulcanized; and good product quality.

Description

technical field [0001] The invention relates to a cable accessory in the field of power cable transmission system, in particular to an outdoor terminal of a power cable of 500kV or above. Background technique [0002] At present, in power cable transmission systems with voltage levels above 500kV and 500kV, cables are mostly XLPE insulated power cables, and outdoor terminals are used to connect XLPE insulated power cables and overhead lines to realize power transmission. transmission. With the construction of large-scale hydropower stations, pumped storage power stations, and UHV power grids, the use of outdoor terminals is increasing. In the power cable connection system of 500kV and above, outdoor terminals are important connectors. The reliability of outdoor terminals It directly affects the reliability of the transmission system. [0003] In the outdoor terminals of power cables of 500kV and above, the stress cone of the commonly used outdoor terminal is a structural t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02G15/02H02G15/04
Inventor 陈晓鸣杭裕保陈建国
Owner 江苏安靠智能输电工程科技股份有限公司
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