Frequency measurements use the fixed sampling mode as the default, and "System nominal
frequency" should be set to the desired level. When "Sampling mode" is set to "Tracking", the device
uses the measured frequency value as the system nominal frequency. There are three frequency
reference channels: f Ref1, fRef2 and fRef3. With these parameters it is possible to set up three voltage
or current channels to be used for frequency sampling. Parameter "f.meas in use" indicates which of
the three channels are used for sampling if any.
Current measurement
Figure. 4.7 - 44. Current measurement submenu.
Current measurement submenu includes various individual measurements for each phase or phase-to-
phase measurement.
The
Current measurement submenu has been divided into four sections: "Phase currents", "Residual
currents", "Sequence currents", and "Harmonics".
• "Phase currents" and "Residual currents" have been further divided into four subsections
("Per-unit currents", "Primary currents", "Secondary currents" and "Phase angle"), and they
display the RMS, TRMS and peak-to-peak values, amplitude and power THD values as well
as the angle of each measured component.
• "Sequence currents" has also been further divided into the four above-mentioned sections,
and it calculates the positive, negative and neutral sequence currents.
• "Harmonics" displays current harmonics up to the 31
st
harmonic for the three phase
current (IL1, IL2, IL3) as well as the two residual currents (I01, I02); each component can be
displayed as absolute or percentage values, and as primary or secondary amperages or in
per-unit values.
A
AQ
Q-F201
-F201
Instruction manual
Version: 2.04
42
Содержание AQ-F201
Страница 1: ...AQ F201 Overcurrent and Earth fault relay Instruction manual ...
Страница 220: ...Figure 7 4 146 Example block scheme A AQ Q F201 F201 Instruction manual Version 2 04 219 ...
Страница 226: ...Figure 8 4 151 Device installation A AQ Q F201 F201 Instruction manual Version 2 04 225 ...
Страница 227: ...Figure 8 4 152 Panel cutout dimensions and device spacing A AQ Q F201 F201 Instruction manual Version 2 04 226 ...