The 1kv underground aluminium Hda conductor cable is a low-voltage cable specifically designed for underground power transmission, with high-purity aluminium Hda conductors as the core. It is suitable for underground laying scenarios in urban distribution networks, residential communities, industrial parks, and municipal engineering. This series of cables offers three cross-sectional specifications: 12mm², 25mm², and 100mm², which can meet the power transmission needs of different load intensities, balancing economy and environmental adaptability.​ In terms of structure, the core of the cable is an Hda-grade aluminium conductor, which has excellent electrical conductivity and corrosion resistance after special processing. The choice of aluminium conductor not only significantly reduces the weight of the cable, facilitating handling and installation during underground laying, but also has an advantage over copper conductors in material cost, making it particularly suitable for large-scale underground pipeline projects. The 12mm² conductor is suitable for low-load scenarios such as small user branch lines or courtyard lighting; the 25mm² conductor can meet the main incoming line requirements of medium-sized commercial facilities or multi-storey residences; the 100mm² conductor can carry the centralized power supply task of small and medium-sized factories in industrial parks, ensuring the stable operation of high-power equipment.​ In terms of protective structure, the cable adopts a multi-layer composite design to adapt to the complex underground environment. The outer layer of the conductor is wrapped with a weather-resistant cross-linked polyethylene (XLPE) insulation layer, which has excellent electrical insulation performance and heat aging resistance, effectively isolating moisture and impurities in the soil and avoiding the risk of electric leakage. Outside the insulation layer, there is a steel tape armouring layer, which forms a strong mechanical protection through spiral winding or longitudinal wrapping technology, capable of resisting soil pressure, stone extrusion, and gnawing by rodents during underground laying. The outermost layer is a polyethylene (PE) sheath, which has acid and alkali resistance, UV resistance, and low-temperature resistance. Even in humid and salinized soil, it can maintain structural stability for a long time, extending the service life of the cable.​ In terms of performance, the rated voltage of the cable is 1kv, which meets the standard requirements of low-voltage distribution systems and can stably transmit alternating current or direct current. The long-term allowable operating temperature is 90℃, and it can withstand a high temperature of 250℃ during a short circuit (lasting no more than 5 seconds), ensuring that it will not be damaged due to overheating in case of sudden overload. The current-carrying capacity varies according to the cross-sectional area: the current-carrying capacity of the 12mm² cable is about 50-60A, the 25mm² is about 80-95A, and the 100mm² can reach 180-200A. Users can choose the appropriate specification according to the actual load calculation. In addition, the insulation resistance of the cable exceeds 1000MΩ·km, and the dielectric loss tangent (tanδ) is less than 0.005, ensuring efficient power transmission and reducing energy loss.​ In application scenarios, 12mm² cables are often used for household meter wiring in residential communities, underground wiring of street lights and green irrigation systems; 25mm² cables are suitable for underground trunk lines in urban village reconstruction and small commercial blocks, connecting transformers and distribution cabinets; 100mm² cables are widely used in underground pipe networks of industrial parks to provide power for enterprises such as machinery factories and food factories. Due to the all-aluminium structure, the cable can also effectively avoid electrochemical corrosion caused by stray current in the soil, and is especially suitable for areas with stray current such as subway lines and electrified railway surroundings.​ In terms of installation and maintenance, the cable supports various underground installation methods such as direct burial, pipe laying, and trench laying. For direct burial, it must be buried below the frozen soil layer and keep a safe distance from underground pipelines, optical cables, etc.; for pipe laying, HDPE pipes with smooth inner walls should be used to reduce wear on the sheath during laying. After laying, insulation resistance testing and pressure resistance testing must be carried out to ensure that the cable is undamaged. In daily maintenance, the cable path can be located through ground signs to avoid accidental damage caused by later construction; regularly 检测 the pH value and humidity of the soil, and take anti-corrosion measures in areas with high corrosion risk, which can further extend the service life of the cable.​ In conclusion, the 1kv underground aluminium Hda conductor cable (12mm², 25mm², 100mm²) has become an ideal solution for underground low-voltage distribution systems due to the cost advantage of aluminium conductors, the environmental adaptability of multi-layer protection, and flexible specification options. It can not only meet the power transmission needs of different scenarios but also balance economy and reliability, providing a strong guarantee for the safe and stable operation of underground power networks.