Ultra-high voltage electric cable joint
A cable joint and ultra-high voltage technology, applied in the field of power cables, can solve the problems of electrical tree insulation medium breakdown, insufficient low-voltage electrode stress cone, etc., and achieve shield failure prevention, good electrical and mechanical strength, and optimized field strength distribution. Effect
Active Publication Date: 2011-06-01
TSINGHUA UNIV
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Problems solved by technology
Most of the accidents occurred in other parts such as the high-voltage electrode, and the accidents in the stress cone part of the low-voltage electrode were less, such as figure 1 As shown by the middle arrow, the distribution of electric field intensity is concentrated. If there are defects on the surface of the high-voltage electrode, it is easy to cause the occurrence of electric tree and even the breakdown of the insulating medium.
Therefore, the control of the shape of the low-voltage electrode stress cone in the prefabricated silicone rubber cable joint is not enough
Method used
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[0012] The ultra-high voltage cable joint proposed by the present invention has a structure such as figure 2 As shown, it includes a low-voltage electrode 1, a high-voltage electrode 2, a connecting pipe 3, an insulating medium 4, an outer shielding layer 4 and a wrapping layer 8. The connecting pipe 3 connects the core wires 6 of the two cables. The winding layer 8 is wound on the connecting pipe 3 . The high voltage electrode 2 is wrapped on the winding layer 8 . The low-voltage electrode 1 is symmetrically placed on the two cables. The low-voltage electrode 1 is trumpet-shaped. The end of the low-voltage electrode 1 is located outside the end of the high-voltage electrode 2 on the same side. The horizontal linear distance between the two is L. The high-voltage electrode 2 is cylindrical, and the vertical distance between the side surface of the high-voltage electrode cylinder and the outer shielding layer 7 is W, and the ratio of L to W is: L:W=1:(0.7-2.0). The length o...
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The invention relates to a superhigh voltage cable connector, and belongs to the technical field of electric power cables. In the cable connector, cored wires of two sections of the cables are connected by a connecting pipe, a winding layer is winded on the connecting pipe, a high voltage electrode is coated on the winding layer, low voltage electrodes are symmetrically arranged on the two sections of cables, the end parts of the low voltage electrodes are positioned outside the end parts of the high voltage electrode at the same side, the ratio of the horizontal linear distance therebetween to the vertical distance between the side surface of the high voltage electrode cylinder and an outer shielding layer is L:W = 1:(0.7-2.0); the ratio of L to a length M of the high voltage electrode is L:M =1:(3.0-5.0); the section of the end part is a circular-arc, the ratio of the outside circular-arc radius to the inside circular-arc is R3:R2 =1:(6.0-10.0) and the circular-arc is formed by the outside circular-arc and the inside circular-arc; and the circular-arc radius at the bell mouth edge of the low voltage electrode is R1, and R3:R1 is equal to 1:(2.0-5.0). The cable connector has a simple and convenient installation process by adopting a prefabricated structure, has small volume, safe operation and maintenance and good electric strength and mechanical strength by adopting solid insulation, and has a long service life.
Description
technical field [0001] The invention relates to an ultra-high voltage cable joint, which belongs to the technical field of power cables. Background technique [0002] In recent years, with the rapid development of my country's economy, the demand for electric energy has been increasing, and at the same time, higher requirements have been put forward for the stability and reliability of power transmission and distribution. West-to-east power transmission and pumped storage power stations built for power grid peak regulation and frequency regulation have brought great opportunities for the development of ultra-high voltage cables as outlet methods. In the extra-high voltage power cable system, the cable joint is an indispensable and important link. Compared with the structure of the cable body, the structure of the cable joint is more complex, and the uniformity of the electric field distribution is reduced, so that problems such as electrical tree aging and breakdown often o...
Claims
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IPC IPC(8): H02G15/184
Inventor 周远翔聂琼郭绍伟刘睿
Owner TSINGHUA UNIV