CET Electric Technology
59
Month
to be transferred to the Peak Demand of
Last Month
and then
reset. The terms
This Month
and
Last Month
will become
Since Last
Reset
and
Before Last Reset
.
Predicted
Response
The Predicated Response shows the speed of the predicted demand
output. A value between 70 and 99 is recommended for a reasonably fast
response. Specify a higher value for higher sensitivity.
70* to 99
Table 4-4 Demand Setup
The iMeter 6 provides the following Demand parameters:
Present and Predicted Demand Parameters
Voltage
Uan / Ubn / Ucn / Uln average
Uab / Ubc / Uca / Ull average
Current
Ia / Ib / Ic / I average/ I4
1
Power
kWa / kWb / kWc /kW Total
kvara / kvarb / kvarc / kvar Total
kVAa / kVAb / kVAc / kVA Total
Power Factor
PFa / PFb / PFc /PF Total
Frequency
Frequency
Unbalance
U2 / U0 / I2 / I0 Unbalance
Fundamental
Ia / Ib / Ic
THD
Uan / Ubn / Ucn THD
Uab / Ubc / Uca THD
Ia / Ib / Ic THD
Table 4-5 Demand Parameters
Notes:
1)
I4
is valid if the meter is equipped with the I4 option, and it will be automatically changed to
In (Calculated Neutral
Current)
if the meter is equipped with the AI option.
4.2.6
Max./Min. per Demand Period
The iMeter 6 provides the Max./Min. value per demand period of the following measurements:
▪
3-Phase Voltage and Frequency
▪
3-Phase Current and Neutral Current (I4)
▪
3-Phase Power and Power Factor
▪
Voltage and Current Unbalance
▪
Voltage and Current THD
▪
Current Fundamental
All Max./Min. per Demand Period data can be accessed through communication.
4.3
Power Quality
4.3.1
Phase Angles
Phase analysis is used to identify the angle relationship between 3-phase Voltages and Currents.
For WYE connected systems, the per phase difference of the Current and Voltage angles should correspond to
the per phase PF. For example, if the PF is 0.5 Lag and the Voltage phase angles are 0.0°, 240.0° and 120.0°, the
Current phase angles should have the values of -60.0°, 180.0° and 60.0°, respectively.
4.3.2
Power Quality Parameters
The iMeter 6 provides the following PQ parameters:
4.3.2.1
Fundamental
The iMeter 6 provides the following Fundamental Components (Displacement RMS values):
Fundamental Components
dUan
dUbn
dUcn
dUln average
dUab
dUbc
dUca
dUll average
dIa
dIb
dIc
dI average
dkWa
dkWb
dkWc
dkW Total
dkvara
dkvarb
dkvarc
dkvar Total
dkVAa
dkVAb
dkVAc
dkVA Total
dPFa
dPFb
dPFc
dPF Total
dI4
Table 4-6 Fundamental Components
