Resistance measuring system PWD 2000 al-Co W/A/L

electronicfor cables

The precision holding device PWD2000/P 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 hydraulic operated jaws, the measuring voltage picked up via spring-supported taps, with a distance between the taps of 1000 mm (+/- 0,1mm). 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. Water flow version /W The conductor sample to be measured (length. approx. 1400mm) is placed in a twin-trough. The inner trough, which is filled with flowing water when the pump is running, contains the potential bar for picking up the measuring voltage; it is here where the actual measurement takes place at a constant (water-)temperature. A connected Microohmmeter (e.g. MR300C-A or MR101-PWD) additionally measures the (water-) temperature via a probe and converts the previously measured resistance value to 20°C. The mechanical main function is like the PWD2000 P/L. Air reposing version /A There is one closed trough for the measuring system which is carefully isolated against flowing air from outside. After a given time the temperature of the sample is stable and identical to a special probe. The principle is the same as in the MAT2000T measuring system for stranding machines which is successful used with copper and aluminium cables.