A 20kV power cable is a medium-voltage cable designed to transmit electrical power safely and efficiently at a rated voltage of 20 kilovolts. It is widely used in power distribution networks, industrial facilities, substations, renewable energy systems, and urban infrastructure where reliable energy delivery is essential. Compared with low-voltage cables, a 20kV cable must withstand higher electrical stress, stronger insulation requirements, and more demanding environmental conditions.The structure of a 20kV power cable typically includes a conductor, conductor screen, insulation layer, insulation screen, metallic shielding, and outer sheath. The conductor is usually made of copper or aluminum, chosen for good conductivity and mechanical performance. Around the conductor, a semiconductive screen is applied to smooth the electric field and reduce partial discharge. The insulation layer is commonly made of cross-linked polyethylene, also known as XLPE, because it offers excellent dielectric strength, thermal resistance, and long-term durability. Another semiconductive layer is placed over the insulation to maintain a uniform electric field. In many designs, a metallic shield or copper tape is added to provide grounding, fault current return path, and electromagnetic protection. Finally, the outer sheath protects the cable from moisture, abrasion, chemicals, and other external damage.One of the main advantages of a 20kV power cable is its ability to carry power over medium distances with low losses and high reliability. It is suitable for underground installation, overhead transition systems, and indoor or outdoor use depending on the design. Underground installation is especially common in cities because it improves safety, reduces visual impact, and protects the cable from weather conditions. The cable can also be manufactured with flame-retardant, waterproof, or armoured features to meet different application requirements.Performance and safety are critical for 20kV cables. They must comply with strict electrical standards to ensure stable operation under continuous load, overload, and short-circuit conditions. Proper installation is also important, including correct bending radius, jointing techniques, termination methods, and grounding practices. Poor installation can lead to insulation failure, overheating, or partial discharge, which may reduce service life. For this reason, skilled technicians and suitable accessories are necessary during construction.In practical use, 20kV power cables play a key role in modern power systems. They support reliable electricity distribution to factories, commercial buildings, residential districts, wind farms, solar power stations, and transport networks. Their durability, electrical performance, and adaptability make them an important component of today’s energy infrastructure. As power demand continues to grow and underground networks expand, the use of 20kV cables will remain essential for efficient and secure power transmission.