I” Neg.Seq.Curr.
3PH Tan(phi)
HV I0d> Char current
I” Zero.Seq.Curr.
3PH Cos(phi)
LV I0d> Bias current
Res.Curr.I”01 TRMS
Energy measurements
LV I0d> Diff current
Res.Curr.I”02 TRMS
L1 Exp.Active Energy MWh
LV I0d> Char current
Pha.IL”1 ampl. THD
L1 Exp.Active Energy kWh
Curve1 Input
Pha.IL”2 ampl. THD
L1 Imp.Active Energy MWh
Curve1 Output
Pha.IL”3 ampl. THD
L1 Imp.Active Energy kWh
Curve2 Input
Pha.IL”1 pow. THD
L1 Exp/Imp Act. E balance MWh
Curve2 Output
Pha.IL”2 pow. THD
L1 Exp/Imp Act. E balance kWh
Curve3 Input
Pha.IL”3 pow. THD
L1 Exp.React.Cap.E.Mvarh
Curve3 Output
Res.I”01 ampl. THD
L1 Exp.React.Cap.E.kvarh
Curve4 Input
Res.I”01 pow. THD
L1 Imp.React.Cap.E.Mvarh
Curve4 Output
Res.I”02 ampl. THD
L1 Imp.React.Cap.E.kvarh
Control mode
Res.I”02 pow. THD
L1 Exp/Imp React.Cap.E.bal.Mvarh
Motor status
P-P Curr.I”L1
L1 Exp/Imp React.Cap.E.bal.kvarh
Active setting group
P-P Curr.I”L2
L1 Exp.React.Ind.E.Mvarh
L1 Exp.React.Ind.E.kvarh
5.6.3. Total harmonic distortion (THD)
The total harmonic distortion (THD) function is used for monitoring the content of the current harmonic.
The THD is a measurement of the harmonic distortion present, and it is de ned as the ratio between
the sum of all harmonic components' powers and the power of the fundamental frequency.
Harmonics can be caused by different sources in electric networks such as electric machine drives,
thyristor controls, etc. The function's monitoring of the currents can be used to alarm of the harmonic
content rising too high; this can occur when there is an electric quality requirement in the protected
unit, or when the harmonics generated by the process need to be monitored.
The function constantly measures the phase and residual current magnitudes as well as the harmonic
content of the monitored signals up to the 31
st
harmonic component. When the function is activated,
the measurements are also available for the mimic and the measurement views in the HMI carousel.
The user can also set the alarming limits for each measured channel if the application so requires.
The monitoring of the measured signals can be selected to be based either on an amplitude ratio or on
the above-mentioned power ratio. The difference is in the calculation formula (as shown below):
Figure. 5.6.3. - 76. THD calculation formulas.
While both of these formulas exist, the power ratio (
THD
P
) is recognized by the IEEE, and the amplitude
ratio (
THD
A
) is recognized by the IEC.
AQ-E215
Instruction manual
Version: 2.01
© Arcteq Relays Ltd
134
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