THERMOLIGN® support

PLP’s THERMOLIGN® Support Products are designed for trunnion applications on high-temperature, low-sag (HTLS) conductors, ensuring reliable mechanical support and heat dissipation. These products are essential for securing aluminum-based conductors operating at continuous temperatures above 200°C, making them ideal for modern power transmission systems.

To ensure proper fit and service life, it is recommended that only line post insulators with clamp top trunnion caps that conform to ANSI standards be used.

Uses of THERMOLIGN® Support Products

Mechanical Support for High-Temperature Conductors
- Provides robust support and suspension for HTLS conductors (e.g., ACSS, ACCR) used in modern high-voltage transmission lines.
- Designed to minimize conductor movement and prevent excessive sag under high operating temperatures.
Reducing Wind and Ice-Induced Loadings
- Features a cushioned insert that protects the conductor from mechanical stress caused by wind, ice accumulation, and other environmental factors.
High Vertical Strength for Secure Line Suspension
- Rated at 5,000 pounds (22 kN) in any direction, ensuring a strong, stable support system.
Controlled Load Slippage
- Engineered with a slip load of approximately 20% of the conductor’s Rated Breaking Strength (RBS) to allow for controlled movement under excessive loads while preventing damage.
Accommodates Line Angles
- Supports a maximum line angle of 30° for single-support applications, making it versatile for various transmission system designs.
Compatible with Extra High Voltage (EHV) Applications
- Available with PARROT-BILL rod ends for EHV applications (345 kV and above), ensuring reliability in high-voltage transmission networks.

Key Features of THERMOLIGN® Support Products

Designed for HTLS Conductors – Optimized for aluminum-based conductors operating at high temperatures above 200°C.
Multi-Layer Design – Enhances mechanical performance and provides efficient heat dissipation.
High Mechanical Strength – Rated for 5,000 lbs (22 kN) of vertical support.
Protective Cushioned Insert – Minimizes wear and tear caused by environmental conditions.
Slip Load Mechanism – Prevents excessive tension buildup by allowing controlled movement of the conductor.
EHV Compatibility – Suitable for 345 kV and higher transmission applications.

Applications of THERMOLIGN® Support Products

Transmission Line Support
- Used in overhead high-voltage transmission lines to securely suspend conductors at trunnion locations while maintaining alignment and tension.
High-Temperature Grid Upgrades
- Ideal for modernizing transmission lines with HTLS conductors, ensuring they operate efficiently at high temperatures with minimal sag.
Renewable Energy Transmission
- Supports high-capacity lines transmitting power from solar farms and wind energy projects, ensuring stability and efficiency.
Extreme Weather Applications
- Designed for high-wind, ice-prone, and high-temperature environments, ensuring long-term durability and reliability.