Secondary Zero sequence current
0.00…
300.0A
0.01A Secondary measurement from calculated zero sequence
current
Table. 5.2.1. - 20. Sequence current angle measurements
Name
Range
Step
Description
Positive sequence current angle
0.00…360.0deg
0.01deg
Calculated positive sequence current angle
Negative sequence current angle
0.00…360.0deg
0.01deg
Calculated negative sequence current angle
Zero sequence current angle
0.00…360.0deg
0.01deg
Calculated zero sequence current angle
Table. 5.2.1. - 21. Harmonic current measurements
Name
Range
Step
Description
IL1 Harmonics
IL1 fund…IL1
31harm
0.00…
1000000.0A
0.01A Per unit, primary and secondary harmonics per component for current
input IL1
IL2 Harmonics
IL2 fund…IL2
31harm
0.00…
1000000.0A
0.01A Per unit, primary and secondary harmonics per component for current
input IL2
IL3 Harmonics
IL3 fund…IL3
31harm
0.00…
1000000.0A
0.01A Per unit, primary and secondary harmonics per component for current
input IL3
I01 Harmonics
I01 fund…I01
31harm
0.00…
1000000.0A
0.01A Per unit, primary and secondary harmonics per component for current
input I01
I02 Harmonics
I02 fund…I02
31harm
0.00…
1000000.0A
0.01A Per unit, primary and secondary harmonics per component for current
input I02
5.2.2. Voltage measurement and scaling
Voltage measurement module (VT-module) is used for measuring the voltages from voltage
transformers and processing the measured voltages to measurement database and for use of
measurement- and protection functions (protection function availability depends on IED type). For the
measurements to be correct it is essential to understand the concept of the IEDs voltage
measurements.
Figure. 5.2.2. - 9. Voltage measurement terminology
AQ-T257
Instruction manual
Version: 2.00
23
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