Cable terminal for 220 kV high voltage switch equipment
A technology of cable termination and high voltage switch, applied in the direction of cable termination, etc., can solve the problems of scrap parts, stress concentration at edges and corners, cracking of epoxy resin cured products, etc., to improve the yield, reduce stress, and ensure the effect of manufacturing quality
Inactive Publication Date: 2013-12-18
平顶山市普汇电气有限责任公司
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Problems solved by technology
2. Insert structure: the structure of the embedded connecting insert is hexagonal (such as figure 1 ), the hexagonal structure will cause stress concentration at the corners due to uneven shrinkage during the curing and shrinkage of the epoxy material. After the part is cured, the stress at the corners will gradually release after a period of time, resulting in epoxy Cracking of cured resin, resulting in scrapped parts
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[0009] Such as figure 2 , image 3 As shown, a cable terminal for 220kV high-voltage switchgear includes a conical epoxy resin insulating cylinder 1 with a boss, and a conical aluminum part 2 is inlaid on the inner wall of the thin end of the cylinder. The epoxy resin at the big end is embedded with a ring-shaped aluminum part 3, and at the end of the ring-shaped aluminum part 3 away from the tapered aluminum part 2, a plurality of evenly distributed inserts 4 with threads 6 are connected. 4. The outer surface of one end is a thread 6, and the other end has a threaded hole 7 in the axial direction. Part 4 is super duralumin material.
[0010] As an insert for epoxy resin casting, the thermal expansion coefficient of aluminum is closer to that of epoxy resin material than copper. Since the super duralumin material is used as the insert inside the large end of the epoxy resin cylinder, the insert The cross-section of the part is circular, which avoids the appearance of hexag...
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The invention relates to a cable terminal for 220 kV high voltage switch equipment. The cable terminal comprises a conical epoxy resin insulated cylinder with a boss, a conical aluminum piece is embedded in the inner wall of the thin end of the insulated cylinder, an annular aluminum piece is embedded in the epoxy resin at the large end of the insulated cylinder, a plurality of embedded pieces with threads are evenly distributed and connected to one end, away from the conical aluminum piece, of the annular aluminum piece, threads are formed in the outer surface of the one end of each embedded piece, a threaded hole is formed in the axial direction of the other end of each embedded piece, a cylindrical structure with an annular groove is arranged on the outer surface of one end, with the threaded hole, of each embedded piece, the embedded pieces are made of super-hard aluminum materials, concentration of stress on the embedded pieces during the solidification process of the epoxy resin is lowered, and the phenomenon that resin at the edge of the embedded pieces are cracked is avoided.
Description
technical field [0001] The invention relates to a cable terminal, in particular to a cable terminal for 220kV high-voltage switchgear. Background technique [0002] The cable terminal is the insulator that connects the cable in the high-voltage switch product. During the production process, it was found that the epoxy cured material cracked at the edge of the big end insert, causing the workpiece to be scrapped. After analyzing the material and structure of the insert, the main reason is that the joint surface is poorly bonded and the stress concentration of this part is caused. The main reasons for this phenomenon are the following two points: 1. Insert material: the insert material is H62 (brass), the thermal expansion coefficient of brass is 17×10-6K-1, while the thermal expansion coefficient of pure epoxy resin is about 6~10×10-5K-1, and the thermal expansion coefficient of SiO2 filler is 4.0×10- 6K-1, the thermal expansion coefficient of Al2O3 filler is 7.5×10-6K-1, th...
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IPC IPC(8): H02G15/02
Inventor 徐留前邵世鹏董涵乔广
Owner 平顶山市普汇电气有限责任公司