220 kV Line Bärenburg–Sils Refurbishment of the line

Project Description:
The Bärenburg–Sils route, consisting of two 220 kV lines, was built in the 1950s and serves as an important link for the energy evacuation from the Ferrera and Bärenburg power plants toward Sils. As part of a transmission line refurbishment program, targeted immediate measures are being implemented to ensure the safety and long-term operational reliability of the grid.

Project Goal:
The goal of the project is to enhance the security of the route and ensure the stable operation of the power supply by carrying out a series of urgent measures. These immediate actions are to be implemented in the short term to eliminate existing risks caused by corrosion and wear and to fully meet the technical requirements of the infrastructure again.

Key Aspects of the Project:

1. Renewal of Corroded Masts: Some of the masts, of the "Vögelimast" type, have damage due to corrosion. Four masts, in particular, show visible repair sites. These masts will be replaced to ensure long-term functionality.
2. Renewal of Insulator Chains on Various Masts: For several masts, the conversion to new double suspension chains or double tension chains with new arm tips will be carried out to better absorb mechanical stress. Additionally, existing single chains will be replaced at various masts to maintain mechanical load capacity and safety.
3. Replacement of Ground Wire with Optical Ground Wire (OPGW): The optical ground wire (LWL) in the existing ground wire has reached the end of its service life. To ensure reliable communication, the ground wire with optical ground wire (OPGW) will be completely renewed along the entire route.
4. Renewal of Conductor Wires and Safety Optimizations: In certain sections, the conductor wires are weakened due to numerous repairs, such as spirals and conductor breaks. These sections will be specifically replaced to increase operational safety.
5. Adjustment of Wire Tension: The tension of the conductor wires will be adjusted on-site to increase the clearance from the ground.

Conclusion:
The refurbishment of the Bärenburg–Sils route is a crucial step to ensure long-term operational reliability and grid stability. By replacing corroded masts, renewing insulator chains and conductor wires, and modernizing the ground wire with optical ground wire (OPGW), the infrastructure will be aligned with current technical standards. These immediate measures will not only ensure the safety and reliability of the power supply but also help minimize future operational risks. The implementation of these measures will thus strengthen grid stability and secure energy transmission for the coming decades.

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