THERMOLIGN® Splice

PLP’s THERMOLIGN® Splice Products are designed for high-temperature, low-sag (HTLS) conductors in electrical transmission systems. These splices provide mechanical and electrical continuity between conductor segments while ensuring reliable performance under extreme operating temperatures.

Read more about conductor splices in high voltage electrical transmission ssytems here:

Splicing basics

Uses of THERMOLIGN® Splice Products

Seamless Conductor Connection
- Used to join two segments of HTLS conductors while maintaining full tensile strength and electrical conductivity.
High-Temperature Resistance
- Engineered to operate continuously at temperatures up to 250°C, ensuring performance and stability under heavy electrical loads.
Minimizing Power Losses
- Designed for low electrical resistance, reducing energy losses and ensuring efficient power transmission.
Thermal Expansion Compensation
- Prevents conductor damage by accommodating the thermal expansion and contraction that occurs at high operating temperatures.
No Compression Required
- Unlike traditional compression splices, THERMOLIGN® splices use an innovative non-compression design, simplifying installation and reducing labor time.

Key Features of THERMOLIGN® Splice Products

High-Temperature Operation – Handles up to 250°C for HTLS conductors.
Optimized Electrical Performance – Maintains low-resistance connections for minimal energy loss.
Non-Compression Design – Eliminates the need for hydraulic compression tools, reducing installation complexity.
Durable & Corrosion-Resistant – Built for long service life in extreme weather conditions.
Compatible with Modern Conductors – is intended for use on ACSS/AW and ACCR conductors (NOT for use on conductors with trapezoidal outer strands).

Applications of THERMOLIGN® Splice Products

Transmission Line Extensions & Repairs
- Used when extending transmission lines or repairing damaged conductors without compromising mechanical or electrical integrity.
Upgrading Power Lines
- Supports modernization efforts by allowing utilities to replace traditional conductors with HTLS conductors while ensuring seamless splicing.
Renewable Energy Transmission
- Essential for long-span, high-capacity transmission lines delivering power from solar and wind energy sources.
Extreme Climate & High-Load Areas
- Ideal for use in high-wind, high-temperature, or ice-prone regions, ensuring reliability in demanding environments.