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Protection against reverse active power "RP";
13. 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.
□ atchdog for proper connection the current sensors (CS).
13.6.8 atchdog
The PR122/P unit provides some watchdog functions able guarantee the proper management relay malfunctions.
13.
With the optional PR120/V module, the PR122/P unit also has the following protection functions:
9.
N.9.
13.6.
The signal can combined with relay the PR120/K module with those the PR021/K unit.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 2.3 arm onic distortion
The PR122/P unit signals that peak factor 2. the latter case, under self-powering for 3-phase currents
>300A ca.
□ atchdog for protection Trip.2. Protection against overtemperature ''OT". Protection against overvoltage "OV";
11.
A timing indication (message "alarm" LED) provided the unit's display, which activated during protection alarm.
- 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.
- Power factor. Underfrequency "UF";
14.2.3).
- The protection records the historical data the maximum current read. 2
Page No.2. No.
- Instantaneous current values over given tim interval (data logger).
44/158
.3@2In), the tolerance for the calculation the true rms value will increase.
The signal can combined with relay the PR120/K module with those the PR021/K unit.6) and the "warning" LED lighting up.1, 2xIn). These functions are as
follows:
□ atchdog for presence Auxiliary power supply with "plug" icon displayed. Protection against undervoltage "UV";
10. 13.
- Frequency and peak factor.5In< I4<0.
The ammeter functions both self-supply mode and with auxiliary power supply.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.8In], greater than 6In [where 0. When the circuit-breaker opens, the page with the "Trip" data displayed
(when Test" pressed, automatically the presence Vaux).
□ Rating PLUG validity.Protection against instantaneous short-circuit'T';
4.8In] and greater than 4In [where I4<0.2.
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.
The display shows histograms with the currents the three phases and the neutral the main page. when the PR120/V odule powered, the ammeter and backlighting are always active.
If the waveform has deformation beyond the declared limit (6. enabled, the event the sensors being disconnected Rating Plug error, opening command
is given the being enabled.2. Protection against residual voltage "RV";
12.5In]).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> 0.5xIn current the Ne, the protection considered being set 100%.6.
- Instantaneous voltage values over given tim interval (data logger).7 easurem ent nctions
The current measuring (ammeter) function available all versions the SACE PR122/P unit.
The PR122/P unit allows current signal processing the neutral pole with different relationships relative the value the phases.2.12. Protection against closing short-circuit "MCR";
5. the case where the presence current determined with the circuit-breaker the "OPEN" state, state
error signaled warning message being displayed (see par.: Beyond 15.
13.
When the optional PR120/V connected, the following additional measurement functions are provided:
- Voltage: phase-phase, phase-neutral, residual voltage.6.2 ains frequency
The PR122/P unit constantly measures the frequency the mains voltages connected to, only when PR120/V module installed. The tolerance for the ammeter measuring
chain (current sensor plus relay) described paragraph 13.
- Power: active, reactive, apparent. Protection against earth fault with adjustable delay ''G";
6.B.
- Energy: active, reactive, apparent. addition, the current the phase
under the greatest load given numerical form.
□ atchdog for proper connection the Trip Coil (TC).
The signal can combined with relay the PR120/K module with those the PR021/K unit. disabled when
the alarm condition ceases when the protection has been tripped.
- Currents: three phases (L1, L2, L3), neutral (N), earth fault.
13.
Model L2234 Apparatus Scale
L 2778
Doc.
- Maintenance: number operations, percentage contact wear, opening data storage. 13.2. Where applicable, the earth fault current displayed separate page. Protection against instantaneous short-circuit high currents "Iinst";
7. With
the optional PR120/V module, the UV, OV, voltage protections always work the basis the true rms value the voltages. enabled, any anomalies are indicated special alarm messagean
the "alarm" LED coming on, and the circuit-breaker opens after 1s.
- Maintenance: number operations, percentage contact wear, opening data storage (latest trips and events). Protection against phase unbalance ''U";
8.2.6.
13. Overfrequency "OF"
