On many high-voltage transmission projects in Thailand, new lines have to cross mountain ranges, forests, farmland, highways and rivers. Large differences in tower height, multiple angle towers and frequent crossings make bundled conductor stringing highly challenging. If the stringing system is not properly designed, contractors can easily face issues such as excessive conductor swing, uneven sag and unstable tension, which affect both safety and final line quality.
To address these challenges, the contractor on this project selected 90 units of Triple Stringing Pulley SHSQN320X60(S) specifically for triple-bundled conductor stringing. The pulley features a triple-sheave design, where each subconductor runs in its own nylon groove. This helps reduce mutual interference between subconductors and minimizes the risk of twisting or entanglement, especially on sections with complex angles and long spans.
According to on-site feedback, once the SHSQN320X60(S) Triple Stringing Pulleys were deployed, stringing stability improved significantly on mountainous and complex sections:
Conductor passage at angle towers became smoother, and swing amplitude was clearly reduced.
On long-span crossings, conductor sag was easier to control and tension changes were more predictable.
Coordination between towers improved, with fewer interruptions caused by pulley jamming or conductor jumping out of the groove.
The Thai project manager commented that, in the past, stringing over mountainous terrain was considered a “high-risk operation” that relied heavily on operator experience and consumed a lot of time and manpower. With the Triple Stringing Pulley SHSQN320X60(S), triple-bundled conductor stringing has become more stable and controllable, providing a repeatable equipment solution for future lines in similar complex terrain.
On many high-voltage transmission projects in Thailand, new lines have to cross mountain ranges, forests, farmland, highways and rivers. Large differences in tower height, multiple angle towers and frequent crossings make bundled conductor stringing highly challenging. If the stringing system is not properly designed, contractors can easily face issues such as excessive conductor swing, uneven sag and unstable tension, which affect both safety and final line quality.
To address these challenges, the contractor on this project selected 90 units of Triple Stringing Pulley SHSQN320X60(S) specifically for triple-bundled conductor stringing. The pulley features a triple-sheave design, where each subconductor runs in its own nylon groove. This helps reduce mutual interference between subconductors and minimizes the risk of twisting or entanglement, especially on sections with complex angles and long spans.
According to on-site feedback, once the SHSQN320X60(S) Triple Stringing Pulleys were deployed, stringing stability improved significantly on mountainous and complex sections:
Conductor passage at angle towers became smoother, and swing amplitude was clearly reduced.
On long-span crossings, conductor sag was easier to control and tension changes were more predictable.
Coordination between towers improved, with fewer interruptions caused by pulley jamming or conductor jumping out of the groove.
The Thai project manager commented that, in the past, stringing over mountainous terrain was considered a “high-risk operation” that relied heavily on operator experience and consumed a lot of time and manpower. With the Triple Stringing Pulley SHSQN320X60(S), triple-bundled conductor stringing has become more stable and controllable, providing a repeatable equipment solution for future lines in similar complex terrain.
