User Guide SL7000 IEC7
36
Per quadrant
Aggregate
kvarh Q1 ph 1
kvarh Q1 agg
kvarh Q2 ph 1
kvarh Q2 agg
kvarh Q3 ph 1
kvarh Q3 agg
kvarh Q4 ph 1
kvarh Q4 agg
kvarh Q1 ph 2
kvarh Q2 ph 2
kvarh Q3 ph 2
kvarh Q4 ph 2
kvarh Q1 ph 3
kvarh Q2 ph 3
kvarh Q3 ph 3
kvarh Q4 ph 3
Apparent Energy - 8 Quantities
Per phase
Direction
Aggregate
Direction
kVAh ph 1+
Import
kVAh agg+
Import
kVAh ph 1-
Export
kVAh agg -
Export
kVAh ph 2+
Import
kVAh ph 2-
Export
kVAh ph 3+
Import
kVAh ph 3-
Export
Depending on the meter configuration, apparent energy is calculated by one of the following methods:
•
Arithmetical
Multiplication of the RMS voltage and current values.
S = Urms . Irms (true apparent power - this method gives good results above Ib/10)
•
Vectorial
Quadratic sum of active and reactive powers.
S = (P²+ Q²) (this method is more precise at low currents)
Note:
The arithmetical method is not available on meters configured for 3 wire operation, therefore, the apparent
energy calculation will be done using the vectorial method.
