Reliability Of Parallel Groove Clamps

From the characteristics of metal materials, we know that under stress, the wire will inevitably produce a certain amount of creep, which is more serious inside the parallel groove clamp where the local pressure is large, making the wire slightly thinner and reducing the diameter. If there is no proper compensation function, the grip of the 2 pairs of wires parallel groove connector will decrease, resulting in stress relaxation. When the material is determined, the creep of the wire is related to time, pressure, tension and ambient temperature. The greater the pressure or tension on the wire, the higher the ambient temperature, the more serious the creep of the wire, and the change curve is exponential and increases with time.
To maintain the stability of the grip of the wire aluminium pg clamp, during construction and installation, there must be enough external force to exert appropriate pressure on the wire to prevent bimetal pg clamp from loosening or relative slipping with the wire; it is also necessary to ensure that when the external force disappears, blackburn parallel groove clamp should be able to provide a relatively constant pressure on the wire to compensate for the creep of the wire caused by changes in current, temperature, wind speed, corrosion, etc.
burndy parallel groove clamp During installation, the torque applied to the bolts or nuts often varies from person to person, and there is generally no special measuring instrument to verify the torque, resulting in inconsistent pressure on the wire between different bolts of the same wire clamp or wire clamps installed by different people. Excessive pressure causes excessive creep of the wire; too little pressure causes the wire clamp and the wire to lack sufficient pressure and grip at the beginning of operation. The quality of the spring washer also seriously affects the mechanical stability of the wire clamp. If a poor spring washer is selected, the spring washer will be plastically deformed by external force, which will cause the installed wire clamp to not receive the proper pressure compensation when the wire creeps.
connector parallel groove is installed using special hydraulic tools, and the pressure on the wire is relatively uniform and constant. Its connection with the wire is a one-time hydraulic shaping, so that part of the inner wall material of the wire clamp is embedded in the outer gap of the wire. Because the wire clamp and the outer strand of the wire are made of the same aluminum-based material, it can reduce stress relaxation and compensate for wire creep.
The best mechanical stability should belong to groove clamp. Due to the use of bow-shaped structure and wedge, when the conductor creeps due to various reasons, the bow-shaped structure and the wedge can compensate for the creep, and the initial pressure during installation is provided by special bullets. The goal of controlling pressure can be achieved by reasonably controlling the amount of medicine.