Introduction to copper bonded steel rod and exothermic weld

  • Necessary conditions for a good copper bonded steel rod

    Provide a low-resistance path to ground (copper bonded steel rod resistance) as low as possible. The lower the resistance of the copper bonded steel rod, the more safely the lightning, surge and fault currents are dissipated to earth.

    The copper bonded steel rod conductor shall have good anticorrosion ability and can repeatedly pass large fault currents. The life of the copper bonded steel rod system should not be less than the life of the main equipment on the ground. Generally at least 30 years of life is required. The long-term, reliable and stable copper bonded steel rod system is the fundamental guarantee to maintain the stable operation of equipment and ensure the safety of equipment and personnel. The key to long-term safe and reliable operation of copper bonded steel rod system lies in the correct selection of suitable copper bonded steel rod material and reliable connection. The above are the necessary conditions for a good copper bonded steel rod

    Comparison of copper bonded steel rod connection methods

    Copper-silver welding connection method. The connection between flat copper bars and flat copper bars, between flat copper bars and bare copper stranded wires, and between bare copper stranded wires and bare copper stranded wires can all be connected by copper-silver welding. The commonly used copper-silver welding is acetylene. Welding, arc welding, etc., this welding is only the surface overlap. There is no fusion inside. The joint is not dense, and the performance is only slightly better than that of crimping and bolting. The performance of welded joints also depends on the proficiency of the operating technician, especially brazing. Even if you hold a special job certificate, some welding defects are more likely to occur. Pass or fail cannot be observed from the surface. Moreover, this welding is applied to the connection between pure copper copper bonded steel rods. Not suitable for the connection of copper-coated copper bonded steel rods. For the above reasons. The copper-silver welding method is rarely used in the actual construction of copper bonded steel rod systems in power engineering.

    Crimp clamp connection method. The connection between stranded wire and stranded wire mostly uses the crimping clamp connection method. However, this method is more suitable for one-to-one connection of two twisted wires, and it is impossible to make a good cross-connection. To cross. A special cross wire clip is required. Or first form copper bonded steel rod copper bars and copper bonded steel rod wire clips. After dealing with the contact surface between the two. Then use the bolt connection method.

    Bolted connection method. The connection between the flat copper bar and the flat copper bar, between the flat copper bar and the stranded wire, and between the stranded wire and the stranded wire can also be connected by bolts, which complements each other with the crimping clamp connection method. However, the contact standard of the bolted joint should be handled in accordance with the current national standard "Code for Construction and Acceptance of Busbar Installation in Electrical Installation Engineering". Currently. The crimping clamp method and the bolt connection method are widely used in construction sites. This is closely related to the knowledge and training level of electric power construction technicians in our country. The above is the comparison of copper bonded steel rod connection methods.

    Copper bonded steel rod

    Advantages of exothermic weld

    The welding method is simple. Easy to master: no external power source or heat source is required; materials and tools for welding are light and easy to carry: the current-carrying capacity of the welding point is equal to the current-carrying capacity of the wire: welding is a long-lasting molecular bond that will not loosen Detach; solder joints are like copper, with strong corrosion resistance. Welding speed is fast. Save labor; the quality of welding can be identified from the appearance of the welding joint: it can be used for welding copper, copper alloy, copper-plated steel, various alloy steels, including stainless steel and high-resistance heating heat source materials. outside. exothermic weld has passed the strict demonstration of UL standard. And by the IEEEStd80 outline and other regulations towel designated as the copper bonded steel rod system buried conductor ground connection: in the country. The exothermic welding technology has passed the inspection of the product quality supervision and inspection center of the State Power Corporation Wuhan High Voltage Research Institute, Zhejiang Electric Power Test Research Institute and other departments. And has been applied to the key projects of the power system. Exothermic welds in different joining forms. The above are the advantages of exothermic weld.

    Operating procedures of exothermic weld

    Exothermic weld utilizes highly active aluminum to reduce copper oxide. The whole process takes only a few seconds. The heat released by the reaction is sufficient to melt the ends of the wires being soldered to form longer-lasting molecular synthesis. The general formula for a copper-based exothermic reaction is: 3Cu20 2AI-=-A1203 3Cu heat (2735°C)

    Operating procedures of exothermic weld: Preparation: Clean the wire and mold, then heat the mold with a blowtorch to remove moisture. The wire is then placed into the mold and the clamps are fastened to secure the mold. Put the cup-shaped flux into the mold: put the terminal of the electronic controller on the ignition bar: cover the lid and press the button of the electronic controller for 5 seconds and then ignite; open the mold and remove the steel cup. The welded joints are visible. Remove the slag and wait for the next welding.

    In summary. Exothermic weld is an ideal connection method for copper bonded steel rod, and its convenient and quick operation and high welding quality cannot be achieved by other connection methods. Above operating procedures of exothermic weld.

    Exothermic weld