Poznámky redaktora
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.
The signal can combined with relay the PR120/K module with those the PR021/K unit. Protection against instantaneous short-circuit high currents "Iinst";
7.
13.2.8 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. Protection against closing short-circuit "MCR";
5.
The display shows histograms with the currents the three phases and the neutral the main page. 13. the case where the presence current determined with the circuit-breaker the "OPEN" state, state
error signaled warning message being displayed (see par.6.2.6.12.2.9.
- The protection records the historical data the maximum current read.
If the waveform has deformation beyond the declared limit (6.
13. Protection against residual voltage "RV";
12.8In], greater than 6In [where 0.
13.1, 2xIn). These functions are as
follows:
□ atchdog for presence Auxiliary power supply with "plug" icon displayed. 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.
Model L2234 Apparatus Scale
L 2778
Doc. With
the optional PR120/V module, the UV, OV, voltage protections always work the basis the true rms value the voltages.
□ Rating PLUG validity.
The ammeter functions both self-supply mode and with auxiliary power supply. when the PR120/V odule powered, the ammeter and backlighting are always active.
A timing indication (message "alarm" LED) provided the unit's display, which activated during protection alarm. 13. addition, the current the phase
under the greatest load given numerical form.6.2.
N.2.6.
□ atchdog for proper connection the Trip Coil (TC).2.3).B.
13. Where applicable, the earth fault current displayed separate page.
□ atchdog for protection Trip.5In]). Protection against overtemperature ''OT". Protection against undervoltage "UV";
10.Protection against instantaneous short-circuit'T';
4.
- Maintenance: number operations, percentage contact wear, opening data storage.
- Maintenance: number operations, percentage contact wear, opening data storage (latest trips and events).
13.2 ains frequency
The PR122/P unit constantly measures the frequency the mains voltages connected to, only when PR120/V module installed.
The signal can combined with relay the PR120/K module with those the PR021/K unit.
- Currents: three phases (L1, L2, L3), neutral (N), earth fault.
The PR122/P unit allows current signal processing the neutral pole with different relationships relative the value the phases. Protection against reverse active power "RP";
13.
With the optional PR120/V module, the PR122/P unit also has the following protection functions:
9.6) and the "warning" LED lighting up.
The signal can combined with relay the PR120/K module with those the PR021/K unit. enabled, any anomalies are indicated special alarm messagean
the "alarm" LED coming on, and the circuit-breaker opens after 1s.5In< I4<0.4 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. Underfrequency "UF";
14.3 arm onic distortion
The PR122/P unit signals that peak factor 2.
- 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. Protection against phase unbalance ''U";
8.
When the optional PR120/V connected, the following additional measurement functions are provided:
- Voltage: phase-phase, phase-neutral, residual voltage.
- Instantaneous voltage values over given tim interval (data logger).2.3@2In), the tolerance for the calculation the true rms value will increase.
- Frequency and peak factor.5xIn current the Ne, the protection considered being set 100%.
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 earth fault with adjustable delay ''G";
6.
□ atchdog for proper connection the current sensors (CS).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.
13.: Beyond 15.
- Instantaneous current values over given tim interval (data logger). Protection against overvoltage "OV";
11. No.
- Power factor.
- Energy: active, reactive, apparent. disabled when
the alarm condition ceases when the protection has been tripped.
44/158
.7 easurem ent nctions
The current measuring (ammeter) function available all versions the SACE PR122/P unit.6.8In] and greater than 4In [where I4<0. When the circuit-breaker opens, the page with the "Trip" data displayed
(when Test" pressed, automatically the presence Vaux).
- Power: active, reactive, apparent. 2
Page No. the latter case, under self-powering for 3-phase currents
>300A ca. Overfrequency "OF". enabled, the event the sensors being disconnected Rating Plug error, opening command
is given the being enabled
