At Ningbo Changshi, we provide the essential tools and equipment used by the professionals who physically install and maintain the components shown in these diagrams.

• Bringing the Diagram to Life: The lines and cables shown on an electrical distribution diagram are the exact conductors that are installed using our Overhead Transmission Line (OHTL) wire cable conductor tension stringing equipment for overhead projects or our Underground Cable Laying Equipment for below-ground systems. Our tools ensure that these conductors are installed with the precise tension and without damage, which is critical for the long-term integrity and efficiency of the line.

• One-Stop Supply for the System: Every component represented on the diagram—from the lines to the poles to the connections at a substation—requires specialized tools for installation and maintenance. Our comprehensive one-stop supply model means that contractors and utility companies can get all the necessary equipment, from hydraulic pullers and tensioners to cable blocks and winches, from a single, reliable partner.

We empower our clients to translate the plans on a diagram into a safe, efficient, and operational power grid.

Answer: Tension stringing is the most professional and safest method for installing overhead conductors. It involves controlling the conductor's tension to keep it clear of the ground and other obstacles during the stringing process. The key advantages are:

• Reduced Damage: It prevents the conductor from scraping against the ground, trees, or other structures, protecting its surface and extending its lifespan.

• Improved Safety: It minimizes the risk to workers and the public by eliminating uncontrolled conductor movement.

• Precise Sag Control: It allows for the precise installation of the conductor to achieve the correct sag and tension, which is crucial for the long-term integrity of the line.

• Increased Efficiency: Our advanced hydraulic pullers and tensioners allow for faster, more controlled stringing, reducing project completion times. Our equipment, including conductor pullers, tensioners, and anti-twist wire ropes, ensures these operations are conducted with maximum precision and safety.

Answer: The sustainability of a power grid is heavily influenced by the materials used in its construction. One major trend is the use of materials with lower carbon footprints, such as recycled aluminum for conductors and the adoption of materials that require less energy to produce. Furthermore, a material's durability and longevity directly reduce the need for frequent replacement, which in turn lowers the grid's overall environmental impact. By manufacturing equipment that supports the use of these advanced, long-lasting materials, Ningbo Changshi is contributing to a greener, more sustainable power infrastructure. We are committed to providing the tools needed to build a more environmentally responsible grid.

Answer: OPGW live line installation is a highly specialized task that requires meticulous planning and adherence to strict safety protocols. The primary concerns are electrical hazards from the energized phase conductors and induced voltage, which can pose a significant risk to workers and equipment. Key safety measures include:

• Proper Grounding: The use of specialized grounding rollers and insulated equipment to ensure all metallic components are safely grounded to the tower.

• Insulation: Employing insulated pulling ropes and anti-twist devices to prevent accidental contact with energized lines.

• Specialized Equipment: Using tools like mobile traction machines that can safely run along the existing earth wire, keeping workers at a safe distance from the energized conductors.

• Proximity and Clearance: Strict adherence to minimum approach distances (MAD) to the live conductors at all times.

Answer: OPGW live line installation requires a specific suite of equipment to ensure both safety and efficiency. Unlike traditional stringing, these tools are designed to operate in a high-voltage environment. The essential equipment includes:

• Mobile Traction Machine: A self-propelled, remote-controlled machine that runs on the existing ground wire to deliver guide ropes and rollers, eliminating the need for a lineman to carry them manually.

• Double Sheave Support Rollers: These unique rollers are used to simultaneously pull the new OPGW cable and retrieve the old earth wire, ensuring a smooth, continuous process without dropping the conductors.

• OPGW Grips and Clamps: Specialized grips and clamps with long jaws designed to secure the OPGW cable without damaging the sensitive optical fibers inside.

• Anti-Twist Devices: Swivels and counterweights are crucial for preventing the OPGW cable from twisting during the stringing process, which could damage the internal fibers.