As an example, studies from the Electrical Apparatus Service Association
(EASA) show that a 2% increase in voltage unbalance for a 3-phase system can have detrimental effects on 3-phase induction motor operation. Some examples:
(a) increase in motor temperature by 20°C
(b) increase I2R copper losses by as much as 30%
(c) decrease overall efficiency by as much as 2%
(d) winding insulation life expectancy is significantly reduced; rule of thumb is for every 10°C increase in winding temperature the insulation life in halved.
Motor manufacturers can supply, upon request, detail operational specifications and typical test data on products. These examples suggest that monitoring and analyzing 3-phase motor operational conditions could lead to substantial cost savings.
Dataforth has a complete line of signal conditioning modules and data acquisition sub-systems for monitoring temperature, voltages, currents and speed (RPM via frequency) which are available for establishing 3-phase motor monitoring systems. In particular DSCA33, SCM5B33, and SCMVAS product families convert AC potentials into True RMS direct current as well as protect and isolate hazardous voltages from the data acquisition system!
Dataforth True RMS signal conditioner products:DSCA33SCM5B33
Dataforth Voltage Attenuation System:SCMVAS
Remember, our Application Engineers can assist you with signal conditioner selection over the phone or via fax and email. Call us at our manufacturing facility in Tucson at 520-741-1404 (fax 520-741-0762) or Email us at firstname.lastname@example.org