Operation Manual

MI 2092 Power Harmonics Analyser Section I General information
12
3. Specifications
The instrument’s technical specification below details the performance standard or limit
to which the instrument has been designed and tested.
3.1. Inputs
3.1.1 AC Voltages
The instrument has a three-phase AC voltage input (3 differential inputs, L
1
– N
1
, L
2
–
N
2
, L
3
- N
3
).
Voltage measurement is direct with internal voltage dividers.
There are no internal fuses in the voltage inputs.
· CAT III 600 V, 300 V to GND
· Input range: 10 - 550 Vrms (0.02 U
n -
U
n
)
· Permissible overload: 600 Vrms
· Resolution: 0.1 V
· Accuracy: ± 0.5 % of reading ± 2 digits
· Crest factor max. 1.4
· Frequency range : 43.-.68 Hz fundamental
3.1.2 AC Currents
The instrument has three AC current inputs, suitable for Clamp-on CTs or other current
sensors.
· Input range: 0.02 - 1 Volt rms (0.02 I
n
- I
n
)
Equivalent to 20 - 1000 Amp with the standard Clamp-on CT.
· Resolution: 0.3 mV (0.3 Amp with the standard Clamp-on CT.)
· Accuracy: ± 0.5 % of reading ± 6 digits plus current transformer accuracy
· Crest factor: 2.5
· Maximum permissible overload: 150 % I
n
(sinusoidal current)
· Maximum input voltage: 1 Vrms
· Accuracy of standard Clamp: 1% (20 A – 1000 A) phase Error 2 - 0.5
· Use double insulated minimum CAT III 600V Clamp-on CTs and/or
current transformers