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L2275
Emax UL
73/132
Doc. N°
Mod.
RH0109002
Apparatus
Scale
Page N°
15.2.8.3
Power measurements
The PR113 unit is able to provide measurement of the active, reactive and apparent powers of the three phases and of the relative total powers
(of the system), both with self-supply and with an auxiliary power supply.
You access the “Active power” page from the one of voltage measurements using the key (
↑
to go back). Still with
↓
in succession, you access
the other two “Reactive power” and “Apparent Power” pages. From the latter, by pressing
↓
again, you return to the default page.
The minimum value of power measurable is 0.02xPn
phase
(2% of the nominal of phase A x In).
The maximum value of power measurable is 19.2xPn
phase.
Range
0.4 … 2xPn
fase
Measurement precision
3 % *
*: With cos}v > 0.5.
15.2.8.4
Other Measurements
15.2.8.4.1 Power factor Measurements
15.2.8.4.2 Frequency and Peak factor Measurements
This page allows display of the network frequency. This is calculated on the voltages (if Umax > 0.1Un) and, if these are lacking, on the currents
(if Imax > 0.1In). The calculation of the frequency allows a precision of ± 0.1Hz (after a maximum of 5s from the variation of the
frequency).
15.2.8.4.3 Energy Measurements
From the “Measurements/Trips” menu it is possible to access a whole series of other measurements. Only
the “Power factor” and “Frequency/peak factor” pages are also available with self-supply. Position the cursor
arrow over the required position and press the
↵
key to access the measurement desired.
The PR113 unit provides measurement of the power factor of each phase and of the system (calculated
as a weighted average of the phase factors). For phase power under 2% (0.02xPnfase), the value is not
displayed and is replaced by ‘…..’.
The measurement precision is class 2 in the interval [0.5…1].
Measurement of the peak factor - relationship between I
peak
/ I
rms
- for each of the phases is also present. The
measurement is not displayed for phase current less than 0.3xIn and is not available for phase current above
6xIn. The accuracy of the calculation follows what is indicated for measurement of the currents (see par.
15.2.8.1).
The unit carries out counter measurements of active, reactive, and total apparent energy of the system.
The minimum value which can be displayed is 0.001MWh or 0.001Mvarh or 0.001MVAh. The counter resets
itself when the apparent energy accumulated reaches a value equivalent to 200 days at the nominal three-
phase power of the power circuit breaker (continuous).
By pressing the “RESET” key inside the page the counter is reset.
The accuracy of the calculation follows what is indicated for measurement of the powers (see par. 15.2.8.3).
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