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Where applicable, the earth fault current displayed separate page.. new start-up possible
after the current has dropped below this threshold.2 Protection “S”
This protection can disabled; can the fixed time (t=k) inverse time (t=k/i2) type. enabled, the event undefined Rating Plug error Installation error, opening
command given the being enabled. 30s, with steps 0.
The start-up function enables the protection threshold (S, and changed during time interval lasting "ts", starting from "start-up".2.9.1 and par.
13..
□ Rating PLUG validity. 15.9.2.5xI2. The other characteristics are the same those for thermal memory
"L" (see par.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. 13. No.
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.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.8 Watchdog
The PR123/DC unit provides some watchdog functions able guarantee the proper management relay malfunctions.
13.
The display shows histogram the polarity the main page.
Only one type curve can specified, defined the IEC standard 60255-8.2. 1SDH000635R0002
Page No.1 Thermal memory “S”
The thermal memory function can enabled for cable protection the case where the curve with inverse time selected. enabled, any anomalies are indicated special alarm message and the "alarm"
LED coming on.
- Data Logger: see par.2 Start-up threshold “S”
The start-up function can selected the case where the curve with fixed time selected.2.1. |
^Start Up
Threshold I2
Programmed time ts
• Start-up time
The start-up time common all the protections involved. This based the
"tS" parameter defined the trip time the curve (t2) selected 1. 13.2.
□ Watchdog for protection Trip.
The function can disabled and setting characteristic the single protection units. the PR120/D-M module installed, this activates the coil opening command (YO), thus opening the CB.10In, 0.
13.
□ Watchdog for proper connection the trip coil (TC).2.01s.3) for the PR120/V-PR120/LV MEASURING
module.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.9.
To examine the Measurement functions, see the relevant paragraphs (par.
51/108
.
100 •t2
2
m ax
13.
Model 3447 pparatus Emax cale
Doc.
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.2.9.7 Measurement functions
13. These functions are as
follows:
□ Watchdog for presence Auxiliary power supply with "plug" icon displayed.2.
It the PR123/DC release that automatically decides which the two use, according the various situations.
13.1In steps).9.1..1).2. Range: 0.
13.. The last intervals (adjustable from 5
to 120 min) are stored non-volatile memory and displayed bar graph.2. 14.1 Protection “L”
The "L" the only protection that cannot disabled because for self-protection against overloading the relay itself.5.2. The
latter must intended follows:
- Passage the RMS value the maximum current over one single adjustable threshold (0.1s . addition, the current the phase under the greatest load given numerical
form.9. the latter case, the trip time given the expression:
where where the fault current and the protection threshold.The current measuring (ammeter) function available all versions the SACE PR123/DC unit.
NB: Time expressed seconds.9 Description the protection functions
13
