METREL MI 2893 - 400 Hz Systems Specification; Differences in Specification between 400 Hz, VFD and 50;60 Hz Systems; Phase Angle; VFD (Variable Frequency Drive) Systems Specification

MI 2893 / MI 2892 / MI 2885 Measurements
228
6.2.23 Phase angle
Measuring range
Resolution
Accuracy
-180.0° ÷ 180.0°
0.1°
± 0.6°
6.2.24 400Hz systems specification
Sampling frequency:
Normal operation
12,2 kSamples/sec
Antialiasing filter
Passband (-3dB): 0 ÷ 5,7kHz
Stopband (-80dB): > 6,44 kHz
Cycle aggregation:
50 cycles
6.2.25 VFD (Variable frequency drive) systems specification
Sampling frequency:
Normal operation
1,7 kSamples/sec
Antialiasing filter
Passband (-3dB): 0 ÷ 782 Hz
Stopband (-80dB): > 883 Hz
Cycle aggregation:
5 cycles
6.2.26 Differences in specification between 400Hz, VFD and 50/60 Hz systems
Measurement / Recording
400Hz
VFD
50 Hz / 60Hz
Voltage
•
(1)
•
(1)
•
Current
•
(1)
•
(1)
•
Frequency
335 Hz ÷ 465 Hz
5 Hz ÷ 120 Hz
•
Power
•
(1)
•
(1)
•
Energy
•
(1)
•
(1)
•
Unbalance
•
(1)
•
(1)
•
Flicker
-
-
•
THD
•
•
•
Voltage Harmonics
0 ÷ 13
th
0 ÷ 20
th (3)
0 ÷ 50
th
Current Harmonics
0 ÷ 13
th
0 ÷ 20
th (3)
0 ÷ 50
th
Voltage Interharmonics
-
0 ÷ 20
th (3)
1 ÷ 50
th
Current Interharmonics
-
0 ÷ 20
th
1 ÷ 50
th
Events
•
(1)
•
(1)
•
RVC - Rapid Voltage Changes
-
•
(1)
•
Signalling
-
-
•
Network Configurations
•
(1)
•
(1)
•
General recorder
•
(1)
•
(1)
•
Waveform / inrush recorder
•
(1)
•
(1)
•
Transient recorder
•
(1)
•
(1)
•
Waveform Snapshot
•
(1)
•
(1)
•
Cycle aggregation
50 cycles
5 cycles
10/12 cycles
(1)
Identical technical specification (accuracy, measurement ranges, etc) as on 50Hz/60Hz systems
(2)
On 3-phase 4-wire systems measurement are performed on 3 voltage and 4 current channels, channel
U
N-GND
is not used.
(3)
Number of harmonics depends on voltage/current frequency 5÷16Hz – 20 harmonics, 16÷33Hz 13
harmonics, 33 ÷ 120Hz 5 harmonics