GE D90 Plus Instruction Manual page 164

DIRECT INPUTS AND OUTPUTS
154
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
Plus
For UR -series IED 1:
PLUS
D90 LINE DISTANCE PROTECTION SYSTEM – INSTRUCTION MANUAL
CHAPTER 6: COMMUNICATIONS