The project of replace the overhead line (OHL) with underground medium voltage (MV) cables, follow these general steps:
1- Survey and Planning: Conduct a survey to determine the route for the underground cables, considering factors like terrain, existing infrastructure, and environmental impact. Plan the cable layout, including cable routes, cable sizes, and termination points.
2- Obtain Permits and Approvals: Obtain necessary permits and approvals from local authorities, landowners, and relevant stakeholders for trenching, excavation, and cable installation.
3- Trenching and Excavation: Excavate trenches along the planned route for laying the underground cables. Ensure compliance with safety regulations and environmental guidelines during excavation.
4- Cable Installation: Lay the MV cables in the trenches according to the planned layout. Use appropriate cable laying techniques and equipment to ensure proper cable alignment and depth. Install cable markers and warning tapes as required.
5- Jointing and Terminations: Install cable joints and terminations at specified intervals and at connection points such as substations, transformers, and distribution boards. Ensure proper insulation and sealing to protect against moisture and environmental factors.
6- Testing and Commissioning: Conduct tests such as insulation resistance, continuity, and voltage withstand tests to ensure the integrity and performance of the installed cables. Commission the underground MV system after successful testing.
7- Backfilling and Restoration: Backfill the trenches with suitable materials and restore the surface to its original condition. Ensure proper compaction and restoration to prevent ground settlement and damage to the cables.
8- Documentation and Maintenance: Document the installation process, including cable specifications, test results, as-built drawings, and maintenance procedures. Establish a regular maintenance schedule to inspect, test, and maintain the underground MV cables for optimal performance and longevity.
9- Safety Precautions: Throughout the process, prioritize safety by adhering to safety protocols, providing proper training to personnel, and implementing safety measures to prevent accidents and injuries.
10- Compliance and Regulations: Ensure compliance with relevant electrical codes, standards, and regulations governing underground cable installation, including safety, environmental, and quality requirements.
The major concerns in this project crossing main roads with underground medium voltage (MV) cables requires careful planning and adherence to safety regulations.