Self-Supply; Auxiliary Power Supply; Powered By The Pr120/V Module; Description Of Inputs/Outputs - ABB SACE Emax Series Installation, Service And Maintenance Instructions

With the optional PR120/V module, the PR122/P also assures the following protections:
Symbol Protection against
UV undervoltage
OV overvoltage
RV residual voltage
RP reverse active power
UF underfrequency
O F overfrequency
U phase-to-phase voltage unbalance (as an alternative to phase currents)
13.2.2 Electrical characteristics
Rated operating frequency
Pass band
Peak factor
MTBF (MIL-HDBK-217E)
13.2.2.1

Self-supply

The self-supply enables the protection unit to be powered with the busbar current using current transformers.
Using this supply mode, the unit's protection functions are assured, however, not the accessory functions regarding the modules.
The characteristics are given in the table below:
General characteristics
Minimum three-phase busbar current for enabling relay and switching on the display

1 3 . 2 . 2 . 2 Auxiliary power supply

The external auxiliary power supply is provided using a galvanically-separated power pack.
Since the auxiliary voltage needs to be isolated from the ground, "galvanically separated converters" in accordance with
the IEC standard 60950 (UL 1950) or the equivalent IEC 60364-41 and CEI 64-8 have to be used to guarantee a current in
common mode or leakage current (as defined in IEC 478/1 and CEI 22/3) no greater than 3.5mA.
The presence of the auxiliary power supply enables the relay unit to be used even with the circuit-breaker open, as well as powering all the modules.
The characteristics of the power pack are given in the table below:
Characteristics
Auxiliary voltage
(galvanically separated)
Maximum ripple
Inrush current @ 24V
Rated power @ 24V
13.2.2.3

Powered by the PR120/V module

For a full explanation of the features of the PR120/V, see par. 15.1.
13.2.3 Environmental characteristics
Operating temperature
Storage temperature
Relative humidity
Degree of protection (with PR122/P installed in the CB)

13.2.4 Description of inputs/outputs

13.2.4.1 Binary inputs
– K51/SZin:
– K51/Gzin:
13.2.4.2 Binary outputs
– K51/SZout:
– K51/GZout:
Note: These inputs/outputs should be used between PR122/PR123 and PR332/PR333 series units only.
13.2.5 Communication bus
Local bus on rear connector; RS485 physical interface, Modbus protocol.
External system bus, RS485 physical interface, Modbus RTU protocol, baud rate 9600-19200 bps.
Test bus on front test connector.
13.2.6 Protection functions
The PR122/P protection unit carries out 8 independent protection functions. In particular:
1. Protection against overload with inverse time "L";
2. Protection against short-circuit with adjustable delay "S";
L2234
Model
L2778
Version PR122/P
24V DC ±20%
5%
~10 A for 5ms
~5W
Zone selectivity: input for protection S
Zone selectivity: input for protection G
Zone selectivity: output for protection S
Zone selectivity: output for protection G
50/60 Hz ±10%
3000 Hz max
6.3 max @ 2In
15 years @ 45°C
Relay Enabling
E1...E3
>70A
-25°C ... +70°C
-40°C ... +90°C
0% ... 98% with condensation
IP 30
(only with Vaux)
(only with Vaux)
(only with Vaux)
(only with Vaux)
Apparatus
Doc. No.
1SDH000460R0002
Display Switch-On
E4...E6 E1...E3 E4...E6
>140A >160A >320A
Emax
Scale
Page No.
43/158