I. Overview of Pre-branch Cables
Pre-branch cables are trunk cables with multiple branch cables extending from them. They are commonly used in underground power grids, distributing power to different areas and enabling interconnection between different power equipment, facilitating management and maintenance. They primarily consist of branch cables, a main cable, a branch box, and a junction box. Pre-branch cables effectively ensure system safety and reliability during power transmission and are therefore widely used.
II. Advantages of Pre-branch Cables
1. Safety and Reliability: Pre-branch cables utilize a branching structure, effectively preventing single points of failure and preventing a single point from spreading throughout the system. Furthermore, the branches of pre-branch cables can be configured arbitrarily, flexibly meeting the specific needs of power systems and improving reliability and safety.
2. Energy-Saving: Pre-branch cables can be configured arbitrarily, eliminating the need for additional junction boxes and leads, reducing costs and energy consumption, thereby improving economic benefits and energy efficiency.
3. High Load Capacity: Compared to traditional cables, pre-branch cables have larger main cable cross-sections, capable of carrying greater current loads and suitable for high-power transmission.
4. Easy Installation: Pre-branch cables are prefabricated on-site and can be transported directly to the site for installation. This simplifies the on-site installation process and avoids the problem of excessive joint resistance.
III. Disadvantages of Pre-branch Cables
1. Higher Cost: Pre-branch cables require more investment in manufacturing, installation, and maintenance, making them more expensive than traditional cables.
2. Difficult to Replace: If a pre-branch cable fails and needs to be replaced, it requires extensive dismantling and rewiring, impacting the normal operation and maintenance cycle of the equipment.
3. Difficult Maintenance: Due to its unique structure, pre-branch cables are difficult to repair and inspect, requiring the involvement of professional technicians.
IV. Laying and Installation of Pre-branch Cables
Laying Method: The laying method for pre-branch cables is similar to that of ordinary cables, but the prefabricated branches make installation easier.
Installation Precautions: During installation, ensure that the branch joints have low contact resistance and high short-circuit strength to ensure long-term stable operation of the cable.
