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The display shows histograms with the currents the three phases and the neutral the main page.
13.
□ Rating PLUG validity.Protection against instantaneous short-circuit'T';
4. Protection against earth fault with adjustable delay ''G";
6.8 atchdog
The PR122/P unit provides some watchdog functions able guarantee the proper management relay malfunctions. The tolerance for the ammeter measuring
chain (current sensor plus relay) described paragraph 13.
- Frequency and peak factor.
The PR122/P unit allows current signal processing the neutral pole with different relationships relative the value the phases.: Beyond 15.5xIn current the Ne, the protection considered being set 100%.
□ atchdog for protection Trip.
- Maintenance: number operations, percentage contact wear, opening data storage (latest trips and events). 2
Page No.
□ atchdog for proper connection the Trip Coil (TC).6) and the "warning" LED lighting up.
- Instantaneous current values over given tim interval (data logger). Protection against residual voltage "RV";
12. Protection against phase unbalance ''U";
8.2.3@2In), the tolerance for the calculation the true rms value will increase.
- Maintenance: number operations, percentage contact wear, opening data storage.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. These functions are as
follows:
□ atchdog for presence Auxiliary power supply with "plug" icon displayed.1, 2xIn). enabled, the event the sensors being disconnected Rating Plug error, opening command
is given the being enabled.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.
- Power factor.2. 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.3 arm onic distortion
The PR122/P unit signals that peak factor 2. No. Protection against overvoltage "OV";
11. Protection against closing short-circuit "MCR";
5. Protection against undervoltage "UV";
10.
The ammeter functions both self-supply mode and with auxiliary power supply.
13.2.3).6.2 ains frequency
The PR122/P unit constantly measures the frequency the mains voltages connected to, only when PR120/V module installed. when the PR120/V odule powered, the ammeter and backlighting are always active.2.
13.
N.
- Currents: three phases (L1, L2, L3), neutral (N), earth fault.
When the optional PR120/V connected, the following additional measurement functions are provided:
- Voltage: phase-phase, phase-neutral, residual voltage.
If the waveform has deformation beyond the declared limit (6. disabled when
the alarm condition ceases when the protection has been tripped.6.9.8In] and greater than 4In [where I4<0.
The signal can combined with relay the PR120/K module with those the PR021/K unit. Overfrequency "OF".2.
13.
The signal can combined with relay the PR120/K module with those the PR021/K unit. the case where the presence current determined with the circuit-breaker the "OPEN" state, state
error signaled warning message being displayed (see par. With
the optional PR120/V module, the UV, OV, voltage protections always work the basis the true rms value the voltages. the latter case, under self-powering for 3-phase currents
>300A ca.
- 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.
- The protection records the historical data the maximum current read.
The signal can combined with relay the PR120/K module with those the PR021/K unit. When the circuit-breaker opens, the page with the "Trip" data displayed
(when Test" pressed, automatically the presence Vaux).
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. Protection against reverse active power "RP";
13.
13.
- Power: active, reactive, apparent.
Model L2234 Apparatus Scale
L 2778
Doc. enabled, any anomalies are indicated special alarm messagean
the "alarm" LED coming on, and the circuit-breaker opens after 1s.
A timing indication (message "alarm" LED) provided the unit's display, which activated during protection alarm. Protection against instantaneous short-circuit high currents "Iinst";
7.2.7 easurem ent nctions
The current measuring (ammeter) function available all versions the SACE PR122/P unit.
44/158
.
With the optional PR120/V module, the PR122/P unit also has the following protection functions:
9. addition, the current the phase
under the greatest load given numerical form.
13.4 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.6.6.12. 13.2.
- Energy: active, reactive, apparent. Where applicable, the earth fault current displayed separate page. 13.2. Underfrequency "UF";
14. Protection against overtemperature ''OT".5In]).B.8In], greater than 6In [where 0.6.
□ atchdog for proper connection the current sensors (CS).
- Instantaneous voltage values over given tim interval (data logger).5In< I4<0
