Cropico microhmmeter for anti-corrosion testing

Overhead Line Fittings' (OLF) testing involved a heat-cycle process that utilised a Cropico D05000 microhmmeter for the measurement of resistance levels.

A current of 700A was passed through a bi-metallic joint in a cycle of one hour energised and 40min de-energised.

Humidity levels averaged 60 per cent during the testing, which was conducted on compound-treated and non-treated joints continuously for 96 hours.

Resistance readings were taken automatically at the rate of two per second, showing that levels rose as the galvanic corrosion started to attack the joint.

The testing confirmed that an oxide-inhibiting compound can have a positive impact on the electrical performance of the type of bi-metallic joints used on transmission and distribution power liners.

The Cropico D05000 microhmmeter enables highly accurate low-resistance measurement to be undertaken, to ensure that products meet relevant technical performance standards and specifications.

Programmable current levels and the selection of different test speed settings give the D05000 tester the flexibility to accurately measure the resistance values of different cable products.

These include single-end and plain soft wires to bunched, stranded and large-diameter rope-type conductors.