The Reliability Of Parallel Groove Clamps

From the properties of metallic materials, we know that under stress, conductors inevitably undergo a certain degree of creep, which is more severe in areas with higher localized pressure single bolt parallel groove connector, causing the conductor to become slightly thinner and its diameter to decrease. Without proper compensation, the gripping force of the connector parallel groove clamp on the conductor will decrease, resulting in stress relaxation. Once the material is determined, conductor creep is related to time, pressure, tension, and ambient temperature. The greater the pressure or tension on the conductor, and the higher the ambient temperature, the more severe the conductor creep, and the change curve is exponential, continuously increasing with time.
To maintain the stability of the gripping force of the connector parallel groove connector on the conductor, during installation, sufficient external force is required to generate appropriate pressure on the conductor to prevent loosening or relative slippage between the connector aluminium pg clamp and the conductor; it is also necessary to ensure that after the external force is removed, the connector bimetal pg clamp can provide a relatively constant pressure on the conductor to compensate for the effects of conductor creep caused by changes in current, temperature, wind speed, and corrosion.
During the installation of bolt-type connectors blackburn parallel groove clamp, the torque applied to the bolts or nuts often varies from person to person, and specialized measuring instruments are generally not used to verify the torque, leading to inconsistent pressure on the conductor between different bolts of the same connector or between connectors installed by different personnel. Excessive pressure causes excessive conductor creep; insufficient pressure results in insufficient pressure and gripping force between the connector and the conductor in the early stages of operation. The quality of the spring washer also seriously affects the mechanical stability of the connector. If a poor-quality spring washer is used, it will undergo significant plastic deformation under external force, leading to insufficient pressure compensation when the conductor creeps after installation.
H-type connectors burndy parallel groove clamp are installed using specialized hydraulic tools, resulting in more uniform and constant pressure on the conductor. The connection with the conductor is a one-time hydraulic forming process, which embeds the inner wall material of the clamp into the outer layer gaps of the conductor.  Because the clamp and the outer strands of the conductor are made of the same aluminum-based material, this reduces stress relaxation and compensates for conductor creep.
The best mechanical stability belongs to the wedge type connector parallel groove. Due to the use of an arched structure and wedge blocks, the arched structure and wedge blocks can compensate for creep when the conductor creeps due to various reasons. The initial pressure during installation is provided by a special cartridge, and the pressure can be controlled by adjusting the amount of propellant.