REVALCO RANM23

2 modules DIN (the smaller present on the market) is the best solution in order to save space on cabinets and in meantime to have a good readability of measures;

main scope of multifunction meters in an electrical net.

Nine red leds with high intensity on three lines, permit to show 3 measurements at the same time.

Two buttons on front permit to change the measurement pages easily and in natural way.

During the setting phase, the instrument shows the different possibilities present in the device; so it is not necessary to have in the hands the user’s manual all the

time.

“Power supply” page can be used in all the cases on which is important the information of “lost power supply” (example in refrigerating machines and/or cold

storage)

The possibility to reset the energy consumption and time, permits to show in easy way the relative consumption in a certain time

Current on neutral wire: meaning of Iunbalanced measurement (unbalanced current). It is frequent now, also in normal distribution nets, the use of devices on

which the load is not linear. With the scope to calculate correctly the neutral cable and to verify the correspondence with the project data, measurement of current

on neutral ( or unbalanced current measure) become fundamental.

These loads absorb not sinusoidal currents, generating harmonic waves as consequence. Third harmonic waves and their multiples, in a 3phase system, are in

phase between them constituting homopolar terns.

In a 4 wire systems these homopolar terns (Io) makes an aritmetical sum and go along the neutral cable; as result the current on it is: Ino=3*Io. So, as example, a

third harmonic component I3, present on 3 phases with amplitude 40% respect to the fundamental, causes on neutral a current higher than the fundamental

(1,2*Inom)

It was in the past a rare situation. Current on neutral was caused principally by the

unbalanced loads and the solution was to calculate the section of neutral cables

equal or less to the phase cables section.

Now the standard CEI 64-8 art. 524.3, explain well that: neutral cable in multiphase

circuits, on which the phase cables have section more than 16mm2 (copper wire) or

25mm2 (aluminium cable), can have less section (min 16mm2 or 25mm2 in any case)

on condition that the section supports the current present on neutral: unbalanced

current added of eventual harmonic waves,

Our device 1RANM23 is able to measure this current.