154
D90
PLUS
LINE DISTANCE PROTECTION SYSTEM – INSTRUCTION MANUAL
DIRECT INPUTS AND OUTPUTS
CHAPTER 6: COMMUNICATIONS
Figure 133: Three-terminal line application
A permissive pilot-aided or blocking scheme can be accomplished using a dual-ring
configuration as shown below.
Figure 134: Dual-channel closed loop (dual-ring) configuration
The following settings should be applied to implement this application. For all IEDs, set the
inter-relay application for both channels as follows in the
Settings > Communications >
Inter-Relay
menu.
Figure 135: Inter-relay communications settings for IED 1
Figure 136: Inter-relay communications settings for IEDs 2 through 3
For UR
Plus
-series IED 1:
85
,('
3OXV
85
,('
3OXV
85
,('
3OXV
$&'5
$&'5
85
VHULHV
,('
3OXV
7;
5;
85
VHULHV
,('
3OXV
5;
7;
7;
5;
5;
7;
85
VHULHV
,('
3OXV
5;
7;
7;
5;