9.Dnp 3.0 Bus; Time Synchronization - ABB REX 521 Technical Reference Manual, General

1MRS 751108-MUM
4.1.12.9.
4.1.13.
Protection Relay
Technical Reference Manual, General
DNP 3.0 Bus
The REX 521 can also be connected to a DNP 3.0 system.
The DNP 3.0 protocol is used in a substation automation system for connecting the
protection devices to a system level device. A daisy chain network configuration is
used and the physical interface is made by two-wire RS-485 (see Figure 4.1.12.9.-
1). Optical RS-232 interface (star-topology) is also possible to use with DNP 3.0 in
REX 521.
The transmission speed is configurable up to 19200 kbits/s and support for
unsolicited messages is included.
DNP 3.0 Master
RS-485 twisted pair
R E X 5 2x R E X 5 2x R E X 5 2x
REX 521
Fig. 4.1.12.9.-1 Example of a DNP 3.0 system
For more information of DNP 3.0 in REX 521, see DNP 3.0 Communication
Protocol for REF 54_ and REX 521 Technical Description (see "Related
documents" on page 7).

Time synchronization

The time synchronization (Configuration\Time) of the protection relay can
be given from different sources:
1. The time can always be given manually from the front panel.
2. The time synchronization can also be given externally. The master parameter for
external synchronization source selection is called Sync. source. This
parameter can have two different states:
• "Net Messages" state
• "X3.1.2 Input" state
RER 133 RER 133
RER 133 RS485 INTERFACE S1 RS485 INTERFACE S1
ON RER 133 ON
1 2 3 4 5 6 7 8 1 2 3 4 5 6 7 8
4 WIRE TERMINATED OFF 4 WIRE TERMINATED OFF
S1 OFF ON ON OFF OFF NC NC NC S2 S1 OFF ON ON OFF OFF NC NC NC S2
S2 ON ON ON ON ON ON NC NC ON S2 ON ON ON ON ON ON NC NC ON
4 WIRE WITHOUT TERMINATION 4 WIRE WITHOUT TERMINATION
S1 OFF ON ON OFF OFF NC NC NC OFF S1 OFF ON ON OFF OFF NC NC NC OFF
S2 OFF OFF OFF OFF OFF OFF NC NC 8 A + S2 OFF OFF OFF OFF OFF OFF NC NC 8 A +
2 WIRE TERMINATED 7 B – RX 2 WIRE TERMINATED 7 B – RX
S1 ON OFF ON OFF OFF NC NC NC 6 A + 4WIRE – S1 ON OFF ON OFF OFF NC NC NC 6 A + 4WIRE –
S2 OFF OFF OFF ON ON ON NC NC 5 B – 2WIRE TX S2 OFF OFF OFF ON ON ON NC NC 5 B – 2WIRE TX
2 WIRE WITHOUT TERMINATION 4 AGND 2 WIRE WITHOUT TERMINATION 4 AGND
3 NC 3 NC
S1 ON OFF ON OFF OFF NC NC NC 2 Shield GND C S1 ON OFF ON OFF OFF NC NC NC 2 Shield GND C
S2 OFF OFF OFF OFF OFF OFF NC NC 1 Shield GND S2 OFF OFF OFF OFF OFF OFF NC NC 1 Shield GND
RS232 RS485 RS232 RS485
I I
0 0
F F
C C
E E
REF 54_ relays
REX 521
RER 133
RER 133 RS485 INTERFACE S1
ON
1 2 3 4 5 6 7 8
4 WIRE TERMINATED OFF
S1 OFF ON ON OFF OFF NC NC NC S2
S2 ON ON ON ON ON ON NC NC ON
4 WIRE WITHOUT TERMINATION
S1 OFF ON ON OFF OFF NC NC NC OFF
S2 OFF OFF OFF OFF OFF OFF NC NC 8 A +
2 WIRE TERMINATED 7 B – RX
S1 ON OFF ON OFF OFF NC NC NC 6 A + 4WIRE –
S2 OFF OFF OFF ON ON ON NC NC 5 B – 2WIRE TX
2 WIRE WITHOUT TERMINATION 4 AGND
3 NC
S1 ON OFF ON OFF OFF NC NC NC 2 Shield GND C
S2 OFF OFF OFF OFF OFF OFF NC NC 1 Shield GND
RS232 RS485
I
0
F
C
E
39