Poznámky redaktora
2 ains frequency
The PR123/P unit constantly measures the frequency the mains voltages connected to. No. These functions are as
follows:
□ atchdog for presence Auxiliary power supply with "plug" icon displayed. 15.8 atchdog
The PR123/P unit provides some watchdog functions able guarantee the proper management relay malfunctions.Protection against phase unbalance "U";
9.
□ atchdog for proper connection the current sensors (CS). 14.1 and par. When the circuit-breaker opens, the page with the "Trip" data displayed
(when Test" pressed, automatically the presence Vaux).
If the waveform has deformation beyond the declared limit (6. Protection against overvoltage "OV";
12.2.4 ircuit-breaker state
The PR123/P unit records the state the circuit-breaker means specific wiring the circuit-breaker. addition, the current the phase
under the greatest load given numerical form. Overfrequency "OF".
The signal can combined with relay the optional PR120/K module with those the PR021/K unit. enabled, any anomalies are indicated special alarm message and
the "alarm" LED coming on, and the circuit-breaker opens after 1s.
N.2. Protection against overtemperature "OT";
10. Protection against reverse active power "RP";
14.4
The PR123/P can provide the trend the measurements certain quantities over interval established the user; these include: mean
active power, maximum active power, maximum current, maximum voltage and minimum voltage.6.
Model 2234 Apparatus Scale
L2778
Doc.
If the frequency goes out the permitted range ±10% relation the rated frequency selected (50 60Hz), the "warning" LED comes on
and the warning message displayed (see par. The
UV, OV, voltage protections always work the basis the true rms value the voltages.6. the latter case the event self-powering for 3-phase
currents >300A ca.6.
14.
The display shows histograms with the currents the three phases and the neutral the main page.2.3 arm onic distortion
The PR123/P unit signals that peak factor 2.2.3) for the PR120/V MEASURING module.
14. 16.
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.8In], greater than 6In [where 0.5xIn current the Ne, the protection considered being set 100%. 14.1 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 peak factor 2.3).2.
The PR123/P release provides complete set measurements:
- Currents: three phases (L1, L2, L3), neutral (Ne), earth fault
- Voltage: phase-phase, phase-neutral, residual voltage
- Instantaneous voltage values over given time interval (data logger)
- Power: active, reactive, apparent
- Power factor
- Frequency and peak factor
- Energy: active, reactive, apparent
- Harmonics calculation: the fortieth harmonic (waveform and odule the harmonics displayed); the thirty-fifth for frequency
f=60H z
- Maintenance: number operations, percentage contact wear, opening data storage.9.6.
The signal can combined with relay the PR120/K module with those the PR021/K unit.
The PR123/P unit allows current signal processing the neutral pole with different relationships relative the value the phases.5.7 easurem ent nctions
The current measuring (ammeter) function available all versions the SACE PR123/P unit.
The ammeter functions both self-powering mode and with auxiliary supply. Protection against residual voltage "RV";
13. Where applicable, the earth fault current displayed separate page. The last intervals (adjustable from 5
to 120 min) are stored non-volatile memory and displayed bar graph.
The signal can combined with relay the PR120/K module with those the PR021/K unit.
14.2. Protection against undervoltage "UV";
11.6)
and the "warning" LED lighting up.
14.
14.
To examine the Measurement functions, see the relevant paragraphs (par. when the PR120/V odule installed and powered, ammeter and backlighting are always active.
- Data Logger: see par. 14. disabled when
the alarm condition ceases when the protection has been tripped.
14. The tolerance for
the ammeter measuring chain (current sensor plus ammeter) described paragraph 14.
A timing indication (message "alarm" LED) provided the unit's display, which activated during protection alarm. 2
Page No.1 Rms calculation
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 case where the presence of
current determined with the circuit-breaker the "OPEN" state, state error signaled warning message being displayed (see par.3@2In), the tolerance for the calculation the true rms value will increase. Underfrequency "UF";
15.: Beyond 15.6.2.5In]).
□ Rating PLUG validity.5In< I4<0,8In] and greater than 4In [where I4<0.1, 2xIn).B.16
