A 230kV overhead power transmission line stringing project typically involves detailed planning, design, and execution steps to ensure reliable power delivery and compliance with technical and environmental standards. Here is an overview based on various project cases and guidelines:

Project Design and Planning
Preliminary Design: Includes setting climatic conditions, selecting conductors and ground wires, establishing ground clearance, wiring conditions, insulator sets, supporting structures, and foundations. Special parts like river crossings or urban areas require separate considerations .
Typical Conductors: For example, twin 1590 kcmil “Lapwing” ACSR conductors (about 38 mm diameter) are commonly used, with ampacity around 1500 A per conductor, arranged in twin sets for each phase to match underground cable capacity .
Route and Scope: Projects may involve single or double circuit lines spanning tens to hundreds of kilometers, crossing varied terrain including water bodies, urban areas, and environmentally sensitive zones .

Stringing Methods:
Slack Stringing: Suitable only where conductor can touch the ground and no energized lines are below.
Semi-Tension Stringing: Partial tension, conductor may not be fully off the ground.
Full-Tension Stringing: Preferred for 230kV lines, maintaining full tension to keep conductors clear of obstacles and minimize damage.
Helicopter Stringing: Used for difficult terrain or water crossings .
Stringing Equipment: Hydraulic pullers and tensioners sized for 230kV conductors, stringing blocks (pulleys), anti-twisting ropes, reel stands, conductor grips, and safety equipment are standard .

Notable Case Examples
Kombolcha-Mile-Semera 230kV Transmission Line (Ethiopia):
Double tower, single circuit line about 173 km long.
Designed to improve power export reliability to neighboring countries.
Environmental and social impact assessments guided route selection and construction methods .

Osaki Thermal Power Line (Japan):
220kV line with large water crossings.
Used high-strength corrosion-resistant conductors and advanced stringing techniques including semi-prefabrication and tensioning methods to ensure conductor length accuracy and safety .
Golden Valley 230kV Transmission Line (USA):
Included modern communication and control facilities to manage power flow and ensure operational reliability .

Environmental and Safety Considerations
Projects undergo environmental assessments to analyze alternatives and minimize impact on ecosystems and communities .
Safety during stringing is critical due to high voltage and conductor size; use of proper PPE, communication, and experienced crews is mandatory