An electrical transmission line is a specialized network of conductors and equipment used to transport large quantities of electrical energy at very high voltages over long distances. It acts as the backbone of the power grid, connecting power generation plants (like solar farms, wind farms, or thermal power stations) to substations in cities and towns.

The purpose of a transmission line is to transmit electricity with minimal energy loss. By raising the voltage, the current is reduced, which significantly decreases energy loss due to heat over hundreds of kilometers.

The main components of an overhead transmission line include:

• Conductors: These are the wires that carry the high-voltage electricity. They are typically made of aluminum reinforced with a steel core (ACSR) for strength and are uninsulated, with air acting as the primary insulator. For higher voltages, conductors are often "bundled" into groups to increase capacity and reduce losses.

• Insulators: Made from materials like porcelain, glass, or polymers, insulators are crucial for supporting the conductors and preventing the electrical current from leaking to the support structures or the ground. They are designed to withstand extremely high voltages and environmental stress.

• Support Structures: These are the large towers or poles that hold the conductors high above the ground. Structures can be lattice steel towers for extra-high voltage lines or tubular steel poles for lower voltages and shorter distances. Our specialized equipment, such as tension stringing equipment, is essential for the safe and efficient construction of these structures.

• Ground Wires: Also known as shield wires, these are positioned at the very top of the towers to protect the conductors from direct lightning strikes by diverting the charge safely to the ground.

• Substations: These facilities are critical connection points where transformers "step up" the voltage for transmission and "step down" the voltage for distribution to consumers.

At Ningbo Changshi, we specialize in the comprehensive range of tools and equipment necessary for the construction and maintenance of these vital components, ensuring the reliability and efficiency of the global power grid.