Correct Installation And Splicing Specifications For Parallel Groove Clamps In Overhead Insulated Conductor Operations

In power distribution network upgrades and maintenance, the reliability of overhead insulated conductor connections directly impacts grid operation quality. As a key fitting in non-load-bearing parts, burndy parallel groove clamp is mainly used for branch connections between the main line and the drain line. For insulated conductors of 10kV and below, the construction team must master the correct installation techniques.

Selection and Configuration of Connection Locations

When branching overhead insulated conductors, the selection of clamp connector parallel groove must be determined based on the conductor cross-section. For insulated aluminum stranded wire or steel-cored aluminum stranded wire, matching wedge-shaped clamps or special-shaped clamps should be selected. According to GB50173-2014 "Construction Specification for Overhead Power Lines of 66kV and Below", when a 10kV line uses a groove clamp connection lead wire, the number of clamps should not be less than 2. transition connections between different metals must be equipped with copper-aluminum transition clamps.

Interface Treatment Before Installation

Pre-treatment of insulated conductor connection points is a core step in controlling contact resistance.

• Insulation Stripping: Before connecting overhead insulated conductors to parallel groove, the corresponding length of insulation layer must be stripped. Care should be taken during the stripping process to avoid damaging the inner conductor.

• Oxide Film Removal: An oxide film will quickly form on the exposed aluminum conductor surface in the air. Use a fine wire brush or sandpaper to wipe the wire groove and conductor contact surface along the stranding direction of the aluminum strands. Apply electrical compound grease immediately after removing the oxide film to cover it and isolate it from the air.

Wire Clamp Tightening and Installation Process

The installation methods for parallel groove wire clamps of different structures differ:

• Bolt-type parallel groove wire clamps: After the upper and lower clamps are engaged, use a torque wrench to tighten the bolts evenly in a diagonal sequence. The bolt direction should be uniform, and after tightening the nut, at least two threads should be exposed on the bolt.

• Wedge-type wire clamps: Some wedge-type wire clamps require the use of a ejector gun or manual hydraulic pliers to press the wedge into the housing. The fit between the housing and the wedge must be precise, utilizing the constant clamping force to ensure connection performance.