Aluminium parallel groove clamp (PG clamps) are used for connecting two bare conductor or two insulated overhead line. If aerial bundled conductor is insulated,
insulation must be striped before installing and then is necessary to install PG cover, who replace insulation.
PRODUCT RANGE:
Use for aluminum conductor to aluminum conductor connection.
PG CLAMP is used for small and medium-sized aluminum line or core line, overhead lightning line, non-receptive reception, positional connection, reduction application in non-direct line, jump line connection. Electric power process Material (metal fittings) Linkage lead line Main use for mutual phase connection.
From the characteristics of metal materials, we know that under stress conditions, the wire will inevitably produce a certain creep, which is more serious in the parallel groove clamp with large local pressure, which makes the wire slightly thinner and smaller in diameter. Without the proper compensation function, the grip strength of the groove clamp on the wire will decrease, resulting in stress relaxation. When the material is determined, the wire creep 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 wire creep, and the change curve is exponential, and with time The growth is increasing. To maintain the stability of the gripping force of the parallel groove clamp on the wire, during construction and installation, there must be enough external force to generate a proper pressure on the wire to prevent the parallel groove clamp and the wire from loosening or relative slippage; After the external force disappears, the 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, and corrosion.
When the bolt-type parallel groove clamp (PG clamp) is installed, the torque applied to the bolt or nut is often different from person to person. Generally, no special measuring instrument is used to check the torque, resulting in different bolts of the same clamp or clamps installed by different personnel. The resulting pressure on the wire is not consistent. If the pressure is too high, the wire will creep too much; if the pressure is too small, the pg clamp and the wire will lack sufficient pressure and grip in the early stage of operation. The quality of the spring washer also seriously affects the mechanical stability of the clamp. If a poor spring washer is selected, the plastic deformation of the spring washer will be greater after being subjected to external force, which will cause the installed wire clip to fail to obtain proper pressure compensation when the wire creeps.
