Family 8130  

To save raw material worth up to tens of thousands of dollars, you must very accurately control the strand resistance during the manufacturing process by using AESA 8130 technology.

General Description

  • The 8130 resistance meter has been designed to perform resistance measurements directly on a stranding machine.
  • It comes trolley-mounted allowing it to be moved from one stranding line to another.
  • The 8130 is the only online bridge available in the market providing a "dry" microprocessorized temperature control system.
  • It has been designed to measure copper and aluminium products.
  • It provides very accurate measurements.
  • Three versions are available :
    • The 8136 (the so-called compact version)
    • The 8134 (the so-called standard or long version)
    • The 8135 (especially for large aluminium strands)
  • Copper strands up to 1800 mm² can be measured.
  • Aluminium strands up to 1200 mm² can be measured.
  • The 8130 avoids destructive sample testing.
  • Strands can be measured without waiting for them to cool down.
  • The measured resistance values are automatically corrected to a reference temperature.
  • The operator gets an immediate reading as a percentage of the extra raw material put on the strand under test.
  • No ground insulation required of the stranding machine required due to the AC current induction principle.
  • The 8130 can also be used for laboratory measurements on samples.

Resistance Measurements vs. Weighing Technique

  • When using the weighing technique, there is an uncertainty in the resistivity of the material used.
  • For an equal weight, a solid conductor has a different resistance to that of a stranded conductor due to the lay length and the compacting factor.
  • There is an uncertainty in the sample length.
  • The weighing technique needs samples to be cut, thus generating scrap.
  • In-process measurements are not possible.
  • Aluminium's physical properties are the main obstacle to making easy and accurate resistance measurements.

Disadvantages of off-line Measurements

  • When a sample is cut from the beginning of the strand, you need to scrap too much raw material and this solution is normally not used.
  • When a sample is cut at the end of the strand, the strand is manufactured at a lower speed. Consequently, it has been submitted to smaller mechanical stresses (tensile strength, compacting, imperfect contact between the wires, effect of the stranding length) and has different electrical properties.
  • A cut sample becomes slightly untwisted, thus modifying its resistance.
  • When a sample is cut, it is too late to make adjustments on the stranding line.

Measurements on Large Aluminium Strands

  • It is very difficult to produce good electrical contact between the wires composing the strand.
  • It is necessary to apply a very large pressure (several tons) on the clamping jaws while at the same time avoiding damage to the strand under test.
  • Our experience shows demonstrably excellent and accurate measurements on strands up to 1200mm².