In an overhead power line or substation, a fitting that is suspended from the insulator by a connecting wire, a lightning conductor, or a lightning protection wire suspended from the tower, is called a hanging metal fitting, also known as a supporting metal fitting or a hanging clamp (for the sake of uniformity, the following collectively For "suspension clamps").
First, the basic structure of the suspension clamp.
Suspension clamps generally include components such as a wire hull, a pressure plate (including fastening bolts), and an R pin. The figure below shows the ordinary suspension clamps, which are also parallel hanging panels. The working principle is to use two U-bolts to press the pressure plate, which is the wire clamp in the hull. The specific standard can be found in the national standard, model and data of the suspension clamp (XGU type) GB2318.1-85 (U-shaped screw suspension clamp).
2. Different parts of the suspension clamp.
1. Suspended line clamps different functions of different materials of the hull.
The hull and the pressure plate are usually made of malleable cast iron, aluminum alloy or stamped with steel plate. The wire and ground wire are placed in the hull groove, and the radius of curvature of the hull should be greater than eight times the diameter of the suspended conductor.
(1) A wire clamp made of wrought iron.
A wire clamp supported by wrought iron forms a closed magnetic circuit around the wire. Even if the magnetic resistance is small, hysteresis energy loss will occur under the alternating magnetic field of alternating current, and heat will be generated to raise the temperature of the wire. Overheating the wire will reduce its mechanical strength and limit its power transmission capacity. Therefore, the use of iron (or steel) material to make the suspension clamp has a low investment, but increases the line loss and annual operating costs.
(2) Steel plate stamping suspension clamp.
The hull of the steel stamping suspension clamp is stamped from steel plate without hanging plate. The overhanging point is above the wire axis, and the U-bolt is installed upwards for convenient construction. The wire clamp has the advantages of simple production process, short cycle, high yield, light weight and reduced distribution, and is suitable for installing steel core aluminum stranded wire and aluminum stranded wire of medium and small interface.
(3) A wire clip made of aluminum alloy.
At present, the aluminum alloy material suspension clamp is promoted to achieve energy saving, anti-halation, and the wire clamp is light.
2. Platen
The pressing plate exerts the tightening force of the U-bolt and the gripping force of the platen stroke without the help of the wire and the ground wire.
3. Closed pin (R pin)
Closed pin, also known as R pin, is a part that prevents loose bolts.
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