Preformed Jump Splice
The Preformed Tension Jumper is a non-tension type conductor connecting fitting designed for power transmission and distribution lines. It primarily joins the jumper conductor (downlead) sections on either side of strain/tangent or angle towers in overhead lines, ensuring reliable electrical connection and mechanical fixation.
Product Overview
The Preformed Tension Jumper is a non-tension type conductor connecting fitting designed for power transmission and distribution lines. It primarily joins the jumper conductor (downlead) sections on either side of strain/tangent or angle towers in overhead lines, ensuring reliable electrical connection and mechanical fixation.
Its core structure consists of preformed helixes made of high-strength aluminum alloy strands. These strands tightly spiral-wrap around the ends of two (or more) conductors, utilizing the material's inherent elasticity and massive gripping force generated by helical compression to bond with the conductors. Installation requires no hydraulic tools – simple manual wrapping completes the process.
Key Features
Quick & Easy Installation:
No heavy tools (e.g., hydraulic presses, dies) required.
Hand-installed after minimal training, significantly reducing construction time.
Ideal for confined spaces, aerial work, or harsh weather conditions.
Superior Electrical Performance:
Creates extensive surface contact with conductors, ensuring low, stable contact resistance and minimizing energy loss/heat generation.
Maintains excellent current-carrying capacity.
Reliable Mechanical Performance:
Helical structure delivers uniformly distributed, high radial compressive force.
Low static stress on conductors prevents damage.
Exceptional vibration fatigue resistance and galloping motion resistance, absorbing energy to prevent loosening.
Excellent Corrosion Resistance:
Made of high-strength aluminum alloy strands (e.g., AA1350-H19) compatible with conductors.
Eliminates galvanic corrosion risk (aluminum-to-aluminum connection).
Optional corrosion-inhibiting grease coating enhances protection.
Minimal Conductor Damage:
Zero compression deformation during installation; preserves conductor integrity and avoids stress concentration points.
Critical for aging line retrofits or strength-sensitive applications.
Maintenance-Free:
Long-term reliability due to corrosion/fatigue resistance; typically requires no maintenance.
Broad Compatibility:
Connects same or different conductor types/sizes (select appropriate model).
Joins single conductors or sub-conductors in bundle configurations.
Various models cover standard conductor cross-sections (e.g., JL/G1A-185/30, JL/LB1A-240/30).
Precise Sag Control: Maintains smooth jumper sag profile.
Product application
Preformed Tension Jumpers are widely used in:
HV & EHV Transmission Lines:
Jumper connections at strain/angle/terminal towers.
Line retrofits, maintenance, or jumper replacements.
Substations:
Bus jumper connections.
Equipment downlead-to-conductor joints.
Distribution Networks:
Jumper connections in MV/LV distribution lines.
Distribution system upgrades/repairs.
Long-Span Crossings: Applications demanding high vibration control
Renewable Energy:
Collector line jumpers in wind/solar farms.
Connections within substations.
Railway Electrification: Jumper connections in OCS (Overhead Catenary Systems) or feeder lines.
Aging Line Retrofits: Replaces legacy jumper clamps (e.g., parallel groove clamps) without damaging existing conductors.
Product selection
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