576LE005550A
Function of the Energy trip unit
3.3 Measurement function
Symbol Definition
Pa Active power L1
Pb Active power L2
Pc Active power L3
Qa Reactive power L1
Qb Reactive power L2
Qc Reactive power L3
Sa Apparent power L1
Sb Apparent power L2
Sc Apparent power L3
SV Total apparent power: Vector addition
SA Total apparent power: Arithmetic addition
On the figure above, the value of total apparent power SA by arithmetic addition is
greater than the value of total apparent power SV by vector addition.
Calculation convention setting Default setting
Arithmetic – Vector Vector
List of values aected by the calculation convention setting.
Value Definition
Qtot Total reactive power
Stot Total apparent power
ErIn Reactive energy consumed
ErOut Reactive energy generated
Er Abs Absolute reactive energy
Er Signed reactive energy value
Es Apparent energy
PF1 Power factor L1
PF2 Power factor L2
PF3 Power factor L3
PFtot Total power factor
cos tot Cos total
Qtot Dmd Averaged value (over interval) of total reactive power
Stot Dmd Averaged value (over interval) of total apparent power
Max Qtot Dmd Max. averaged value (over interval) of total reactive power
Max Stot Dmd Max. averaged value (over interval) of total apparent power
Setting the power factor and cos sign convention
This parameter is used to configure the sign for power factors and cos according
to the IEC convention or the IEEE convention in the four-quadrant diagram.
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