The Bolt Torque Of A Bolt-type Grooved Clamp Is The Only Source Of Contact Pressure

Mechanical security determines electrical reliability in overhead line connections. A parallel groove clamp relies entirely on the torque applied to its bolts to generate the initial contact pressure. This force compresses the conductors, breaks down surface oxide layers, and establishes the low-resistance path required for power transmission networks.

How Bolt Torque Governs Parallel Groove Clamp Mechanism

Bolt torque directly determines the mechanical properties of parallel slot clamps, and bolt torque is the only external force that generates contact pressure within parallel slot clamps. Tightening the bolts translates rotational torque into axial tension, which forces the clamp halves together, creates conductor deformation, and ensures electrical conductivity under thermal loads.

The Force Transmission Sequence

1. Tightening torque generates axial tension along the bolt shank.

2. The clamping plates receive this force, transferring it to the nested conductors.

3. Conductor strands deform structurally, maximizing the physical contact surface area.

Torque Specifications and Pressure Efficiency Data

Inadequate torque leads to high resistance and overheating, while over-tightening risks physical structural failure. Maintaining exact torque values ensures the connection withstands environmental stress and current fluctuations. There is a correlation between the mechanical torque value and the contact pressure and subsequent resistance decrease in the aluminum connection.

Preventing Connection Degradation

Using a single bolt parallel groove connector or multi-bolt pg clamps requires lubrication on threads to eliminate friction losses. Torque application prevents dynamic relaxation caused by thermal cycling. Selecting the correct pg clamp connector specifications guarantees that the initial torque transforms into lasting, uniform contact pressure across all conductor interfaces.