Power distribution systems are generally classified by their physical layout and electrical configuration. The two most common physical types are overhead and underground distribution.

• Overhead distribution is the most common and cost-effective method, using poles and conductors to distribute power above ground. This system is easier to install and maintain but can be more vulnerable to weather events.

• underground distribution involves laying insulated cables in conduits or directly in the ground. This system offers enhanced reliability and aesthetic benefits, as it is protected from weather and visual clutter, but requires specialized installation and maintenance equipment.

From an electrical perspective, the systems are often configured in one of three ways:

• Radial System: This is a simple, tree-like structure where power flows from a single source to consumers. It is cost-effective but has a low reliability, as a fault anywhere on the line can cause an outage for all downstream customers.

• Ring Main System: Power is supplied from a main substation and circulates through a closed loop. This provides greater reliability, as a fault can be isolated, and power can still be supplied from the other direction.

• Interconnected System (Network): This is the most reliable system, as it has multiple substations and feeders connected, ensuring continuous supply even if a major fault occurs. This is commonly used in densely populated urban areas.

At Ningbo Changshi, we provide a complete range of equipment and tools for all these distribution line types and configurations. Our Overhead transmission line (OHTL) wire cable conductor tension stringing equipment is ideal for radial and ring main systems, while our Underground cable laying Equipment is perfect for the installation of cables in urban and suburban networks. We offer comprehensive solutions to support projects from the simplest radial line to the most complex interconnected network, ensuring you have the right tools for any job, anywhere in the world.