VEGA74
EN - 17
6.3.
PQA: MEASUREMENT AND RECORDING OF MAIN PARAMETERS
In this section the instrument allows the below operations:
➢
Real-time display of numeric values of any electrical parameters of a single-phase and
three-phase 3-wire or 4-wire system, harmonic analysis of voltages and currents up to
49
th
order, power/energies and power peaks absorbed/generated
➢
Real-time display of any input signal waveform, histogram graphics of harmonics
analysis, vector diagrams of mutual angles between voltages and currents and voltage
unbalances
➢
Recording (by pressing the
GO/STOP
key) of TRMS values of voltages, voltage
anomalies (sags, swells) with 20ms resolution, currents, corresponding harmonics,
active, reactive and apparent powers, power factors and cosphi, active, reactive and
apparent energies.
It will be possible to analyze the recorded data ONLY by
transferring them onto a PC
Saving (by pressing the
SAVE
key) of an “
Instant
”
sampling of instantaneous values of
any parameters present at instrument input in the instrument’s memory.
CAUTION
•
The instrument can be used for measurements on installations with
overvoltage category CAT IV 300V to earth and max 600V between inputs.
Do not connect the instrument on installations with voltage exceeding the
limits indicated in this manual. Exceeding these limits could cause electrical
shock to the user and damage to the instrument.
•
Always connect the measuring cables to the instrument and to the alligator
clips with the accessories disconnected from the system
•
We recommend holding the alligator clip respecting the safety area created
by the hand protection (see § 4.2).
6.3.1. Connections types
The following types of electric systems can be selected in the instrument:
➢
Three-phase system
3
-4WIRES
(three-phase + n PE)
➢
Three-phase system
3
-3WIRES
(three-phase without n PE)
➢
Three-phase system
3
-ARON
(three-phase + PE)
➢
Single-phase system
1
-2WIRES
(phase + neutral)
➢
Three-phase system 4-wires
3
-High Leg
– for USA country
➢
Two-phase system 3-wires
3
-Y Open
– for USA country
➢
Three-phase system 3-wires
3
-
Open
– for USA country
➢
Two-phase system 3-wires
3
-2El. ½
– for USA country
➢
Two-phase system 3-wires
1
-
CentrePoint
– for USA country
Below, the connection schemes corresponging to the above-described situations are
reported:
