Because copper-plated ground wires have very good electrical conductivity, they are widely used in modern people's production and life. In the current lightning protection industry, many people choose copper-plated ground wires for lightning protection first. Compared with traditional galvanized ground wires, how much do you know about copper-plated ground wires?
1. Conductivity: The conductivity of the ground grid material directly affects the power frequency resistance and impulse resistance of the substation ground grid. Depending on the thickness of the coating, the conductivity of copper-plated steel materials is about 20% to 40%, which is much better than steel grounding materials. When high-frequency lightning current strikes, because the skin effect of the conductor is more obvious, the high-frequency conductive properties of copper-plated steel grounding materials further expand their advantages over steel grounding materials.2. Thermal stability: The cross-sectional area of the grounding material mainly depends on its thermal stability.
3. Construction difficulty: Steel grounding grids generally use galvanized flat steel as the horizontal ground grid material, and galvanized angle steel as the vertical ground grid material; copper-clad steel ground grids generally use copper-coated steel strands as the horizontal ground grid material, using Copper-plated round steel serves as the vertical ground electrode. As a vertical ground electrode, copper-plated round steel ground rods are easier to drive into the soil deeper than galvanized angle steel, and grounding construction is also more convenient.
4. Welding reliability: The overlapping of galvanized flat steel mainly relies on arc welding. Due to the high temperature of the welding point, the welding arc is directly exposed to the air. When air intrudes, the liquid metal will undergo strong oxidation and nitridation reactions. , and a large amount of metal evaporates, and the hydrogen atoms decomposed by the moisture in the air under the high temperature of the arc can dissolve into the liquid metal, causing hydrogen embrittlement of the joint, reduced plasticity and toughness, and even cracks.
Compared with traditional galvanized ground wires, copper-plated ground wires are sometimes very large. Not only do they have very strong electrical conductivity, but they also have great advantages in terms of thermal stability, ease of construction, and welding reliability.