The wear of the suspension clamp often causes an accident of the grounding of the lightning protection line, which is a huge hidden danger for the transmission line and the safety of people's lives and property. It will cause electric accidents such as electric brakes or wire-breaking lightning line blows, which is a huge loss for the power grid. Under normal circumstances, the drop of the lightning protection line is due to the wear of the suspension clamp, and the main cause of the wear of the suspension clamp is generally divided into two cases. 1. During the installation process, the size of the suspension clamp is too large or the lightning protection line is not pressed during installation. The lightning protection line and the hull generate vibration in the strong wind. When the lightning protection line wears to a certain extent, the wind or strong current will act. When the lightning protection line is blown and dropped, the lightning protection line is dropped from the suspension clamp and an electric power accident occurs. Second, the thin hanging plate swings and cuts the hull under the action of the wind, because its wind action is constant, and the relative motion of the hanging plate and the hull of the suspended wire clamp lasts for a long time, the wear is frequent, and the force area of the hull hanging shaft changes. 3, when worn to a certain extent, due to the weight of the lightning protection line itself, the suspension line hull falls from the suspension clamp, and a power accident in which the lightning protection line falls.
How to prevent the lightning line falling accident caused by the wear of the suspension clamp? 1. Strengthen inspection and security inspection of power lines For the regular inspection of the suspension clamp, the security inspection is the main measure to prevent the lightning line from falling due to the wear of the suspension clamp. The wear condition of the suspension clamp needs to open the gasket on the hull of the hull hanging shaft of the suspension clamp during the safety inspection to find the specific wear condition of the hull. This requires the security personnel to perform their duties in the inspection process and master the necessary steps of the security inspection. To ensure that the hull wear of the suspension clamp is mastered and replaced regularly. 2, pay attention to the key details during the installation process The size of the suspension clamp is the key. In the installation, the size of the suspension clamp must be determined according to the section of the lightning protection line. In the installation, the aluminum tape winding work and the compaction work must be done strictly according to the process requirements. it is good. And in the installation, in addition to the specific specifications of the load capacity of the metal fittings, there are detailed and thoughtful considerations for other strength parameters. For example, in the windy plain area, the wear of the hanging clamps is inevitable, so it is necessary to use wear-resistant suspension clamps or suspension clamps with wind-proof components in the installation.
How to install the suspension clamp? the steps for installing the suspension clamp are as follows: 1 After the adjustment of the sag is finished, the center mark of the wire is drawn in the take-up trolley; 2 Move the pulley along the line and wind a layer of aluminum tape on the wire; 3 Lift with the pulley group (hand chain hoist, double hook tightener, etc.), the position of the lifting point should be close to the wire hanging point of the cross arm, and it should not be hung in the middle of the horizontal material. The wire must be covered with burlap cloth or other soft materials. Protect and remove the wire from the trolley into the clamp; 4 Install the suspension clamp, so that the center of the suspension hull should be aligned with the center mark of the drawn wire to ensure that the suspension clamp is not skewed. Suspension clamp 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"). 1, 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.
The function of pre-twisted aluminum alloy suspension clamp. The suspension clamp is used in the power circuit to support and suspend. The pre-twisted aluminum suspension clamp has the same function as the traditional suspension clamp. The pre-twisted aluminum suspension clamp also suspends the conductor in the insulator. This is the same as the traditional hungry vertical clamp, but the characteristics of the pre-twisted aluminum suspension clamp are not comparable to the traditional suspension clamp. 1 rubber clamp The pre-twisted aluminum alloy suspension clamp self-guided rubber clamp can improve the self-propelled retrograde of the wire. In terms of anti-wear and anti-vibration, the safety of the pre-twisted aluminum alloy suspension clamp to the wire is compared with the traditional suspension wire. Even worse. The raw material of the rubber clamp is not ordinary rubber. This rubber material is made of EPDM rubber which is resistant to ultraviolet rays, ozone and high temperature. It has great advantages in reducing aging and prolonging life compared with ordinary rubber. And the use of the rubber clamp avoids scratching the wire and the tip discharge, ensuring the safety of the power circuit. 2 aluminum alloy material The traditional suspension clamps mostly use cast iron, and the pre-twisted aluminum alloy suspension clamps are close to the material, which can reduce the eddy current generated by the metal fittings and reduce the energy loss. The power fittings with very tight materials are also the energy-saving fittings advocated by the state. Moreover, the mechanical properties and corrosion resistance of aluminum alloy suspension clamps are unmatched by conventional suspension clamps. The oxidation resistance and acid resistance of aluminum alloy materials in corrosion resistance are excellent properties not found in traditional cast iron materials. Considering comprehensively, the use of pre-twisted aluminum alloy suspension clamps in power transmission and distribution lines has already had the advantage of being proud. The new materials of electric power fittings have been able to slowly replace the original power fittings, ensuring the safety of power transmission and distribution lines. In terms of operation and energy saving, the new power fittings have greater advantages.
How to install the suspension clamp?he steps for installing the suspension clamp are as follows:
1 After the adjustment of the sag is finished, the center mark of the wire is drawn in the take-up trolley; 2 Move the pulley along the line and wind a layer of aluminum tape on the wire; 3 Lift with the pulley group (hand chain hoist, double hook tightener, etc.), the position of the lifting point should be close to the wire hanging point of the cross arm, and it should not be hung in the middle of the horizontal material. The wire must be covered with burlap cloth or other soft materials. Protect and remove the wire from the trolley into the clamp; 4 Install the suspension clamp, so that the center of the suspension hull should be aligned with the center mark of the drawn wire to ensure that the suspension clamp is not skewed.
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