AQ-2xx series devices have a measurement accuracy that is independent of the system frequency.
This has been achieved by adjusting the sample rate of the measurement channels according to the
measured system frequency; this way the FFT calculation always has a whole power cycle in the buffer.
The measurement accuracy is further improved by Arcteq's patented calibration algorithms
that calibrate the analog channels against eight (8) system frequency points for both magnitude and
angle. This frequency-dependent correction compensates the frequency dependencies in the used,
non-linear measurement hardware and improves the measurement accuracy signi cantly. Combined,
these two methods give an accurate measurement result that is independent of the system frequency.
Troubleshooting
When the measured current, voltage or frequency values differ from the expected values, the following
table offers possible solutions for the problems.
Problem
Check / Resolution
The measured current or
voltage amplitude is lower
than it should be./
The values are
"jumping" and are not
stable.
The set system frequency may be wrong. Please check that the frequency settings match the
local system frequency, or change the measurement mode to "Tracking" (
Measurement
→
Frequency
→
"Smpl mode") so the relay adjusts the frequency itself.
The frequency readings
are wrong.
In Tracking mode the relay may interpret the frequency incorrectly if no current is injected into the
CT (or voltage into the VT). Please check the frequency measurement settings (
Measurement
→
Frequency
).
Settings
Table. 5.2.4. - 43. Settings of the frequency tracking.
Name
Range
Step
Default
Description
Sampling mode
("Smpl mode")
0: Fixed
1: Tracking
-
0: Fixed
De nes which measurement sampling mode is in use: the
xed user-de ned frequency, or the tracked system
frequency.
System nominal
frequency
("Sys.nom.f")
7.000…
75.000 Hz
0.001 Hz 50 Hz
The user-de ned system nominal frequency that is used
when the "Sampling mode" setting has been set to "Fixed".
Tracked system
frequency
("Track.sys.f")
0.000…
75.000 Hz
0.001 Hz -
Displays the rough measured system frequency.
Sampling frequency in
use
("Sampl.f used")
0.000…
75.000 Hz
0.001 Hz -
Displays the tracking frequency that is in use at
that moment.
Frequency reference 1
("f Ref1")
0: None
1: CT1IL1
2: CT2IL1
3: VT1U1
4: VT2U1
-
1: CT1IL1
The rst reference source for frequency tracking.
Frequency reference 2
("f Ref2")
0: None
1: CT1IL2
2: CT2IL2
3: VT1U2
4: VT2U2
-
1: CT1IL2
The second reference source for frequency tracking.
Frequency reference 3
("f Ref3")
0: None
1: CT1IL3
2: CT2IL3
3: VT1U3
4: VT2U3
-
1: CT1IL3
The third reference source for frequency tracking.
AQ-E215
Instruction manual
Version: 2.01
65
© Arcteq Relays Ltd
Содержание AQ-E215
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