Caution – HT instruments SIRIUS89N User Manual
Page 89
SIRIUS89N
EN - 87
8.8.2. Using the Instrument in a Three Phase System
CAUTION
The maximum voltage between B1 and B4 inputs is 600 V~ (CATII) / 350V~
phase – earth or 600V~ (CATIII) / 300 V~ phase to earth.
Do not measure voltages exceeding the limits prescribed by this manual.
Should you exceed the voltage limits you could damage the instrument
and/or its components or endanger your safety.
The instrument is a single phase system. So you can analyse a three phase system
repeating 3 times a single phase analysis described in previous paragraph.
Instrument connection in a three-phase system
The Three Phase power values are given by:
Total Active Power = Pt = P1 + P2 + P3
Total Reactive Power = Qt= Q1 + Q2 + Q3
Total Apparent Power = St =
√(Pt
2
+ Qt
2
)