The conductor is the most expensive material in overhead power lines, typically accounting for over 50% of the total material cost, far exceeding insulators, poles, and hardware.
Cost breakdown by component:
Conductor
Accounts for 50%-65% of the total material cost, making it the largest expenditure item.
Commonly used is steel-cored aluminum stranded wire (such as LGJ-240). Its price is significantly affected by fluctuations in aluminum prices, currently around 50-70 RMB/meter (depending on cross-sectional area).
High-voltage lines require multi-split conductors, further increasing costs.
Poles
Account for approximately 20%-30%. The cost of steel towers is far higher than that of concrete poles.
A typical 15-meter concrete pole costs approximately 5000 RMB, while a single 220kV steel tower can cost 60,000-80,000 RMB.
Customized tower designs are required in mountainous areas or special terrains, resulting in even higher prices.
Insulators
Accounting for approximately 10%-15%.
The unit price of a ceramic suspension insulator is approximately 200 yuan per piece, and 6-8 pieces are needed per tower; a 500kV line may require more than 20 pieces.
Hardware and other accessories
Including crossarms, guy wires, grounding devices, etc., accounting for approximately 10% in total.
Although the unit price is not high, the variety and quantity used make the supporting costs considerable.
In summary, although the unit price of towers is high, conductors, due to their length and large quantity used, account for the largest share of the overall cost. In long-distance power transmission projects, the total cost of conductors can exceed 100 million yuan.