Project Overview
Project Name: Plant 300MW CCPP (Combined Cycle Power Plant) O&M
Location: Russia
Scope: Supply of 220kV single V tension insulator strings with turnbuckle for twin conductors and composite insulators
Delivery Time: 2024
Supplier: UNI Electric Group Co., Ltd
Hardware Fitting Details:
220kV composite insulators. Mechanical failing load: 120kN.
U bolt. Material: H.D.G. steel, Height: 200mm, 120kN.
Anchor shackle: 120kN.
Ball link eye: 120kN.
Socket eye: 120kN.
Yoke plate: 120kN.
Turnbuckle: range: 350-520mm, forged steel. 120kN.
Bolted type tension clamp: Aluminium alloy, 110kN.
Project Background
As part of the maintenance and modernization of a 300MW Combined Cycle Power Plant (CCPP) in Russia, aging insulator strings required replacement to enhance grid reliability and operational efficiency. UNI Electric Group was entrusted to supply high-performance 220kV composite insulator strings, including single V tension configurations with turnbuckles, designed for twin conductor applications.
Key Challenges & Solutions
1. Extreme Cold Climate Performance
Russia’s harsh winters demand insulators that can withstand sub-zero temperatures, ice accumulation, and mechanical stress. UNI Electric provided silicone rubber composite insulators with excellent hydrophobicity, ice-shedding properties, and UV resistance, ensuring long-term durability.
2. Mechanical Strength & Flexibility
The single V tension insulator strings needed to support twin conductors while allowing adjustments for sag and tension. The inclusion of turnbuckles enabled precise tension control, improving installation efficiency and long-term stability.
3. Corrosion & Pollution Resistance
Industrial environments near power plants can accelerate insulator degradation. UNI Electric’s composite insulators feature:
✔ Anti-corrosive hardware fittings (galvanized steel or aluminum alloy)
✔ Silicone rubber sheds resistant to pollution and chemical exposure
4. Fast & Reliable Delivery
Despite logistical complexities in 2024, UNI Electric ensured on-time delivery through optimized production planning and efficient shipping coordination.
UNI Electric’s Technical Contributions
Customized 220kV single V tension strings for twin conductors
Turnbuckle-integrated design for easy tension adjustment
High mechanical strength (custom kN rating based on project needs)
Lightweight yet durable composite insulator construction
Compliance with IEC, GOST, and other international standards
Project Outcome
The successful replacement of the 220kV insulator strings contributed to:
✔ Improved power transmission reliability at the 300MW CCPP
✔ Reduced maintenance needs due to superior pollution and ice resistance
✔ Enhanced operational safety with robust mechanical performance
Conclusion
The Plant 300MW CCPP O&M Project in Russia highlights UNI Electric Group’s expertise in delivering high-voltage composite insulator solutions for demanding environments. By providing custom-engineered 220kV tension strings with turnbuckles, UNI Electric supported Russia’s power infrastructure modernization, reinforcing its role as a trusted global supplier in the energy sector.
