Executive Technical Summary

NK1000 achieved 65 to 70 feet on 138 kV tubular structures with additional available clearance.

NK500 achieved 90 to 100 feet during emergency repair over a 230 kV center arm.

Recommended rope deployment ratio is slightly greater than 2 to 1 relative to intended shot height.

200 feet of line was deployed during high elevation testing to ensure adequate reach and slack.

Projectile tail upgrade to 1/4 inch Dyneema improves reliability.

Operational selection between NK500 and NK1000 should be made prior to installation based on congestion and pull strength requirements.

Test Environment

Testing was conducted on energized tubular transmission structures rated at 138 kV and 230 kV using a Reschtech launcher system.

The 138 kV structure represented standard field deployment conditions. The 230 kV configuration involved a higher center arm during an emergency repair scenario requiring maximum elevation.

Shot Height Performance

The NK1000 DEW system consistently cleared 65 to 70 feet on 138 kV structures with spare elevation capacity.

The lighter NK500 system achieved between 90 and 100 feet, demonstrating superior maximum height capability in high elevation applications.

Rope Length Planning Ratio

A slightly greater than 2 to 1 rope length to shot height ratio is recommended for planning.

For example, for approximately 100 feet of elevation, 200 feet of deployed line ensured sufficient reach and safe ground handling slack.

Projectile Attachment and Reliability

The pulling line was connected directly to the Reschtech projectile.

Replacing the original lead tail rope with 1/4 inch Dyneema significantly reduces the risk of tail breakage and improves overall deployment reliability.

Operational Comparison and Risk Management

NK500 offers higher shot height but has a greater tendency to tangle due to lighter construction. Its lower breaking strength allows ground controlled breakaway if entanglement occurs. All observed broken segments fell safely to ground level.

NK1000 provides greater tensile strength and reduced tangling probability, making it appropriate for heavy pull operations and higher resistance environments. However, it does not break away as easily in congested structural configurations.

Best practice is to equip crews with both systems and select the appropriate rope prior to deployment.

Case Study Scenario

During an emergency repair on a 230 kV tubular transmission structure, crews required maximum elevation clearance over the center arm. The NK500 system achieved between 90 and 100 feet, allowing safe placement of the pulling line.

In contrast, on 138 kV structures requiring heavier pull strength and reduced tangling probability, the NK1000 system provided controlled 65 to 70 foot deployment with enhanced handling characteristics.

This comparative deployment confirms the operational value of maintaining both systems in the field toolkit.

Frequently Asked Questions

What maximum height was achieved?

NK500 reached 90 to 100 feet. NK1000 reached 65 to 70 feet with additional elevation available.

How much rope should be used?

Use slightly more than a 2 to 1 ratio. 200 feet of rope was deployed for approximately 100 feet of elevation.

How was the projectile connected?

The line was directly attached to the Reschtech projectile. A 1/4 inch Dyneema tail rope is recommended.

Which system should be selected?

Select NK500 for higher elevation and breakaway control. Select NK1000 for heavier pulls and reduced tangling risk.