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A company manufacturing overhead-transmission and distribution power-line equipment has used a Cropico microhmmeter for resistance measurement during an anti-corrosion product testing programme.

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.

Cropico manufactures a range of specialist instrumentation designed for a wide variety of precision measurement applications.

Resistance measurement – Cropico’s comprehensive range of digital milliohmmeters is designed for the highly accurate precision measurement of low resistance values in a wide variety of electrical, electronic, industrial and engineering applications. The ohmmeter range includes microhmmeters, milliohmmeters, digital and portable ohmmeters.

Temperature measurement – Cropico also supplies a range of highly accurate digital thermometers and thermocouples with PT25 / PT 100 sensor for use in calibration laboratories as well as in applications associated with the aerospace and pharmaceutical, petrochemical and other process industry sectors.

Decade Boxes and Resistance standards – for precision measurement applications and the calibration of laboratory or workplace equipment.

Cable clamps and testers – Cropico also supplies a range of cable and harness testers.

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