Power Quality Analyzer PowerPad
®
IV Model 8345
25
Before making measurements, you must specify the following:
■
Calculation methods
■
Distribution network
■
Type of connection
■
Voltage ratios
■
Current sensors, their ranges, and their ratios
■
Values to record in Trend mode
■
Triggering levels for the transient and inrush current capture modes
■
Alarm thresholds for Alarm mode
■
Units and ranges for Energy mode
■
Monitoring mode’s parameters (using the application software)
3.4.1 Calculation Methods
Press the
button to determine the calculation methods
3.4.1.1 Nominal Values
Press the
button in the function bar to configure the nominal values
For
Nominal frequency
, choose either 50 Hz or 60 Hz
For
Nominal voltage (with neutral)
, enter the nominal voltage (with neutral)
to use in measurements and calculations
For
Nominal voltage (without neutral)
, enter the nominal voltage
(without neutral) to use in measurements and calculations
The nominal voltage configured here is the Nominal System Voltage (U
n
) and
not the Nominal Declared Input Voltage (U
din
) on the instrument’s terminals. It is
possible to configure U
n
between 50 V and 650 kV, but
U
din
must never exceed
1000 V between phases and 400 V between Phase and Neutral.
In the case of medium-voltage or high-voltage networks, a step-down transformer
may be located between the network and measuring instrument. The uncertainty
on the step-down transformer’s ratio affects the measurement’s accuracy. The
measurement is guaranteed only when U
din
= U
n
and the ratio is equal to 1.
