MPI-540 ● MPI-540-PV – BRIEF USER MANUAL
Analyzer settings – a series of the recorder configuration options can be found here,
Energy losses calculator – in this mode the user can estimate financial loss due to poor
quality of power supply,
EXIT – go to the main menu.
5.2.2 Information bar on the parameters of the current network
Below the main screen a bar is displayed, which shows the main parameters of the active measure-
ment system (Fig. 5.2, element ):
nominal voltage,
network frequency,
network layout,
name of the current recording configuration.
The network layout is symbolized by icons:
1-phase system,
2-phase system,
3-phase 4-wire system,
3-phase 3-wire system,
3-phase 3-wire system with the measurement of currents using Aron's method,
5.2.3 Help
On the right side of the title bar the help icon is shown (Fig. 5.2, element ). After its selection, a
context help is displayed, which describes interface elements visible on the screen.
5.3 Connecting the measuring system
5.3.1 Measuring arrangements
The recorder may be connected directly to the following types of AC networks:
single-phase (Fig. 5.3)
2-phase (split-phase) with split-winding of the transformer) (Fig. 5.4),
3-phase 4-wire (Fig. 5.5),
3-phase 3-wire (Fig. 5.6, Fig. 5.7).
In three-wire AC systems, current may be measured by the Aron method (Fig. 5.7), which uses
only two clamps that measure linear currents I
L1
and I
L3
. I
L2
current is then calculated using the follow-
ing formula:
Pay attention to the direction of current clamps (flexible and hard). The clamps should be in-
stalled with the indicating the load direction. It may be verified by conducting an active power meas-
urement – in most types of passive receivers active power is positive. When clamps are inversely
connected, it is possible to change their polarity using in software (Analyzer settings Clamps)
The following figures show schematically how to connect the analyzer to the tested network de-
pending on its type.
To Next Page
Loading...
Need help?
General
