Iron or aluminum metal accessories widely used in transmission lines are collectively referred to as fittings. There are many types of fittings and different uses, such as various wire clamps for installing wires, various hanging loops that form a string of edges, various crimping tubes and repairing tubes for connecting wires, and various types of gaps on split wires. Rods, etc., in addition to all kinds of pull wire fittings used for poles and towers, as well as the size of the protective conductors, must be matched with each other.
Most of the fittings need to withstand greater tension during operation, and some have to ensure good electrical contact at the same time. It is related to the safety of the wire or the tower. Even if it is only damaged, it may cause line failure. Therefore, the quality, correct use and installation of fittings have a certain impact on the installation and transmission of power lines.
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GB 2314-97 |
General technical conditions for power fittings |
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GB/T 2317.1-2000 |
Power fittings mechanical test method |
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GB/T 2317.3-2000 |
Thermal cycle test method for power fittings |
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GB/T 2317.4-2000 |
Electric power fittings acceptance rules, signs and packaging |
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GB/T 9327.4-1988 |
Cable conductor compression and mechanical connection joint test method Thermal cycle test method |
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GB/T 5075-2001 |
Terminology of power fittings |
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DL/T 765.1-2001 |
Technical conditions of fittings for overhead distribution lines |
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DL/T 768.7-2002 |
Electricity fittings manufacturing quality steel parts hot-dip galvanized layer |
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DL/T 683-1999 |
Model naming method for power fittings |
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GB/T 5231-2001 |
Processed copper and copper alloy chemical composition and product shape |
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GB/T 1175-1997 |
Cast zinc alloy |
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Q/ZDJ 50-2006 |
Technical requirements for edge piercing clamps with rated voltages of 10kV and below |
The current standard parts on the market mainly include carbon steel, stainless steel, and copper. 1. Carbon steel: We distinguish low-carbon steel, medium-carbon steel, high-carbon steel, and alloy steel by the carbon content of carbon steel materials. 1 Low-carbon steel C%≤0.25% is usually called A3 steel in China. It is basically called 1008, 1015, 1018, 1022, etc. abroad. Mainly used for products with no hardness requirements such as grade 4.8 bolts, grade 4 nuts, small screws, etc. (Note: 1022 material is mainly used for drill tail nails.) 2 Medium carbon steel 0.25% 3 High carbon steel C%>0.45%. 4 alloy steels are basically not used in the market: alloying elements are added to ordinary carbon steels to increase some of the special properties of the steel: such as 35, 40 chromium molybdenum, SCM435, 10B38. Fangsheng screws mainly use SCM435 chromium-molybdenum alloy steel, the main components are C, Si, Mn, P, S, Cr, Mo. Second, stainless steel: performance level: 45, 50, 60, 70, 801 mainly divided into austenite (18%Cr, 8%Ni), good heat resistance, good corrosion resistance, and good weldability. A1, A2, A42 martensite and 13%Cr have poor corrosion resistance, high strength and good wear resistance. C1, C2, C4 ferritic stainless steel. 18%Cr has better upsetting and corrosion resistance than martensite. Imported materials on the market are mainly from Japan. According to the level, it is mainly divided into SUS302, SUS304, and SUS316. 3. Copper: Commonly used material is brass…zinc-copper alloy. The market mainly uses H62, H65, H68 copper as standard parts.
Post time: Jun-21-2021