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NB: Time expressed seconds. |
^Start Up
Threshold I2
Programmed time ts
• Start-up time
The start-up time common all the protections involved.01s.
13. enabled, any anomalies are indicated special alarm message and the "alarm"
LED coming on. 13.2 Start-up threshold “S”
The start-up function can selected the case where the curve with fixed time selected.5.1 Thermal memory “L”
The thermal memory can enabled protect the cables the basis the "hot state" tripping curve IEC 60255-8
/ If- \
T for I,s and for 12In
where calculated the basis the evolution the current providing there overload condition
The PR123/DC fitted with two instruments make this thermal memory.
It the PR123/DC release that automatically decides which the two use, according the various situations..1. These functions are as
follows:
□ Watchdog for presence Auxiliary power supply with "plug" icon displayed.2.
100 •t2
2
m ax
13.8 Watchdog
The PR123/DC unit provides some watchdog functions able guarantee the proper management relay malfunctions. 14. The last intervals (adjustable from 5
to 120 min) are stored non-volatile memory and displayed bar graph.2.1 Thermal memory “S”
The thermal memory function can enabled for cable protection the case where the curve with inverse time selected.9.2.
To examine the Measurement functions, see the relevant paragraphs (par. This based the
"tS" parameter defined the trip time the curve (t2) selected 1.
The PR123/DC release provides complete set measurements:
- Current
- Voltage
- Instantaneous voltage values over given tim interval (data logger)
- Active power
- Energy
- Maintenance: number operations, percentage contact wear, opening data storage.1). The first only effective when the release powered (it also records
overloads that have not lasted long enough trip the release), while the second works even when the release not powered, reducing any trip
times the case immediate reclosing and enabled soon the tripped. 1SDH000635R0002
Page No. addition, the current the phase under the greatest load given numerical
form. the latter case, the trip time given the expression:
where where the fault current and the protection threshold. 13.
The start-up function enables the protection threshold (S, and changed during time interval lasting "ts", starting from "start-up".
13. enabled, the event undefined Rating Plug error Installation error, opening
command given the being enabled.
- Data Logger: see par.
13.
□ Rating PLUG validity. new start-up possible
after the current has dropped below this threshold. No.9.
□ Watchdog for proper connection the trip coil (TC). 30s, with steps 0.2.2.3) for the PR120/V-PR120/LV MEASURING
module.2.2.2.1 and par.
□ Watchdog for protection Trip.1. Where applicable, the earth fault current displayed separate page.9...9.2.9.
The protection trip time inverse time given the expression:
t for i,^ 12in and for i2/n where the fault current and I1the protection threshold.7 Measurement functions
13.2
The PR123/DC 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.
The function can disabled and setting characteristic the single protection units.
13.
The display shows histogram the polarity the main page.1. The other characteristics are the same those for thermal memory
"L" (see par. The
latter must intended follows:
- Passage the RMS value the maximum current over one single adjustable threshold (0.1 Protection “L”
The "L" the only protection that cannot disabled because for self-protection against overloading the relay itself..
Model 3447 pparatus Emax cale
Doc.1In steps).1s .
51/108
.
Only one type curve can specified, defined the IEC standard 60255-8. Range: 0.
13.2 Protection “S”
This protection can disabled; can the fixed time (t=k) inverse time (t=k/i2) type.2.9.10In, 0.5xI2.9 Description the protection functions
13.The current measuring (ammeter) function available all versions the SACE PR123/DC unit. the PR120/D-M module installed, this activates the coil opening command (YO), thus opening the CB.2. 15
