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1 Calculating the RMS
All the protection functions their respective processing the basis the real rms value the currents and voltages (the protection disabled
for current values greater than 8In [where I4> 0.
Model L2234 Apparatus Scale
L 2778
Doc. Protection against reverse active power "RP";
13.6.
The PR122/P unit allows current signal processing the neutral pole with different relationships relative the value the phases.
- Instantaneous voltage values over given tim interval (data logger). Protection against overtemperature ''OT".Protection against instantaneous short-circuit'T';
4.2.5In< I4<0. Protection against overvoltage "OV";
11.
The signal can combined with relay the PR120/K module with those the PR021/K unit.
- Energy: active, reactive, apparent.
- Frequency and peak factor. the latter case, under self-powering for 3-phase currents
>300A ca.3 arm onic distortion
The PR122/P unit signals that peak factor 2. Protection against residual voltage "RV";
12.1, 2xIn). Protection against instantaneous short-circuit high currents "Iinst";
7. enabled, any anomalies are indicated special alarm message andthe "alarm"
LED coming on; the PR120/D-M module installed, this activates the coil opening command (YO), thus opening the CB. Protection against phase unbalance ''U";
8.
□ Rating PLUG validity.: Beyond 15. Overfrequency "OF".
□ atchdog for protection Trip.
13. disabled when
the alarm condition ceases when the protection has been tripped. Where applicable, the earth fault current displayed separate page.
If the frequency goes out the permitted range ±10% relation the rated frequency selected (50 Hz), the "warning" LED comes
on and the warning message displayed (see par.
□ atchdog for proper connection the Trip Coil (TC).
13.3@2In), the tolerance for the calculation the true rms value will increase.
13.
- Instantaneous current values over given tim interval (data logger).3).2. when the PR120/V odule powered, the ammeter and backlighting are always active. enabled, any anomalies are indicated special alarm messagean
the "alarm" LED coming on, and the circuit-breaker opens after 1s.6) and the "warning" LED lighting up.6. enabled, the event the sensors being disconnected Rating Plug error, opening command
is given the being enabled. addition, the current the phase
under the greatest load given numerical form.2.2.8In] and greater than 4In [where I4<0.
The signal can combined with relay the PR120/K module with those the PR021/K unit. These functions are as
follows:
□ atchdog for presence Auxiliary power supply with "plug" icon displayed. When the circuit-breaker opens, the page with the "Trip" data displayed
(when Test" pressed, automatically the presence Vaux). With
the optional PR120/V module, the UV, OV, voltage protections always work the basis the true rms value the voltages.1 has been exceeded with warning message and the "warning" LED lighting (remember
that the IEC 60947-2 standard annex "F" establishes that the protection unit must function regularly with peakfactor 2.
With the optional PR120/V module, the PR122/P unit also has the following protection functions:
9. 13.2.
- The protection records the historical data the maximum current read. Protection against earth fault with adjustable delay ''G";
6.6.
- Currents: three phases (L1, L2, L3), neutral (N), earth fault.
If the waveform has deformation beyond the declared limit (6.6.
The signal can combined with relay the PR120/K module with those the PR021/K unit. 13.5In]). Protection against undervoltage "UV";
10.12.2. the case where the presence current determined with the circuit-breaker the "OPEN" state, state
error signaled warning message being displayed (see par.
- Maintenance: number operations, percentage contact wear, opening data storage.
13.6.
- Power factor. Underfrequency "UF";
14.
- The protection records the historical data the maximum and minimum phase-to-phase voltage, total maximum and mean active power
and total maximum and mean reactive power. 2
Page No.
The ammeter functions both self-supply mode and with auxiliary power supply.B. Protection against closing short-circuit "MCR";
5.
- Power: active, reactive, apparent.9.
A timing indication (message "alarm" LED) provided the unit's display, which activated during protection alarm. No.
N.2.4 ircuit-breaker state
If auxiliary supply used, powered from the optional PR120/V, the PR122/P unit records the state the circuit-breaker means of
specific wiring the circuit-breaker.
13.2. The tolerance for the ammeter measuring
chain (current sensor plus relay) described paragraph 13.8In], greater than 6In [where 0.
The display shows histograms with the currents the three phases and the neutral the main page.7 easurem ent nctions
The current measuring (ammeter) function available all versions the SACE PR122/P unit.8 atchdog
The PR122/P unit provides some watchdog functions able guarantee the proper management relay malfunctions.
44/158
.
- Maintenance: number operations, percentage contact wear, opening data storage (latest trips and events).
□ atchdog for proper connection the current sensors (CS).2 ains frequency
The PR122/P unit constantly measures the frequency the mains voltages connected to, only when PR120/V module installed.5xIn current the Ne, the protection considered being set 100%.
When the optional PR120/V connected, the following additional measurement functions are provided:
- Voltage: phase-phase, phase-neutral, residual voltage.
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