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Test bus front test connector.. 98% with condensation
Degree protection (with PR123/P installed the CB) 30
14.6 Protection functions
The PR123/P protection unit carries out independent protection functions.5 unication bus
Local internal bus rear connector; RS485 physical interface, Modbus protocol.3 max 2In
MTBF (MIL-HDBK-217E) years 45°C
14..2 Binary outputs
- K51/SZout (K51/DFout): Zone selectivity: output for protection "direct" output for protection D
(only with Vaux)
- K51/GZout (K51/DBout): Zone selectivity: output for protection "reverse" output for protection D
(only with Vaux)
Note: These inputs/outputs can used between PR122/PR123 and PR332/PR333 series units only. 2
Page No. +90°C
Relative humidity .
14.4..2.2 uxiliary power supply
The external auxiliary power supply provided using galvanically-separated power pack.1.. Protection against instantaneous short-circuit high currents inst";
Model 2234 Apparatus Scale
L 2778
Doc.E6
Minimum three-phase busbar current for enabling relay and switching the display >70A >140A >160A >320A
14. particular:
1..2.2.2.3 Environm ental characteristics
Operating temperature -25°C ..4.E3 E4.
The characteristics are given the table below:
General characteristics Relay Enabling Relay ctivation
E1.1 Binary inputs
- K51/SZin (K51/DFin): Zone selectivity: input for protection "direct" input for protection D
(only with Vaux)
- K51/Gzin (K51/DBin): Zone selectivity: input for protection "reverse" direction input for protection D
(only with Vaux)
14.. Protection against short-circuit with adjustable delay "S"and "S2";
3.1 elf-pow ering
Self-powering enables the protection unit powered with the busbar current using current transformers.2.
Using this supply mode, only the unit's protection functions are assured, however, not the accessory functions regarding the modules.
77/158
.4 escription inputs/outputs
14.2.E6 E1.2...2...
14... Protection against instantaneous short-circuit "I";
5.tric ris tic s
Rated operating frequency 50/60Hz ±10%
Pass band 3000Hz max
Peak factor 6. +70°C
Storage temperature -40°C . Protection against earth fault with adjustable delay "G";
7.N°.2.. Protection against directional short-circuit with adjustabledelay "D";
4.
The presence the auxiliary power supply enables the relay unit used even with the circuit-breaker open, well powering all the modules,
with the exception the PR120/V MEASURING module, which powered means connection the busbars.3 Powered the PR120/V odule
For full explanation the features the PR120/V, see par.2.
External system bus, RS485 physical interface, Modbus RTU protocol, baud rate 9600-19200 bps. 15. Protection against overload with inverse time "L";
2.2.
The characteristics the power pack are given the table below:
C haracteristics Version PR123/P
Auxiliary voltage
(galvanically separated) 24V ±20%
Maximum ripple 5%
Inrush current 24V ~10A for 5ms
Rated power 24V ~5W
14.5m A.
14.E3 E4. Protection against closing short-circuit "MCR"
6.
A
Since the auxiliary voltage needs isolated from the ground, "galvanically separated converters" accordance with
the IEC standard 60950 (UL 1950) the equivalent IEC 60364-41 and CEI 64-8 have used guarantee rre in
co ode kage rre (as fin IEC 478/1 and CEI 22/3) 3.2
