Resistance measuring system PWD 3000 Cu / Cu-Al

indirectfor cables

The precision holding device PWD 3000 is used for the determination of the electric resistance per meter of power and medium voltage cables. The measurement is based on the 4-pole method according to Kelvin in order to eliminate the feed line resistances. The measuring current is supplied via pneumatically operated jaws, the measuring voltage picked-up via spring-supported taps, with a distance between the taps of 1000 mm (+/- 0,2mm). The current jaws and thus the current feeding points are arranged at a sufficient distance to the taps in accordance with DIN / IEC to ensure a constant and uniform distribution of the current across the actual measuring distance. The cable section is placed in two inner troughs which are filled with flowing water when the pump is running and are containing the potential bars for picking up the measuring voltage; it is here where the actual measurement takes place at a constant (water-) temperature. The Microohmmeter which is part of the equipment additionally measures the (water-) temperature via a probe, and converts the previously measured resistance value to 20°C (or e.g. 23°C if wanted). The standard holding device PWD 3000 Cu is suitable for copper cables (stranded cables and sector-shaped conductors) of a size between 10mm² and 1200mm² (Ask for larger sizes!).