GE B90 UR Series Instruction Manual page 253

5 SETTINGS
EXAMPLE 2: PILOT-AIDED SCHEMES
Consider a three-terminal line protection application shown in the figure below.
Assume the Hybrid Permissive Overreaching Transfer Trip (Hybrid POTT) scheme is applied using the architecture shown
below. The scheme output operand
Figure 5–68: SINGLE-CHANNEL OPEN-LOOP CONFIGURATION
In the above architecture, Devices 1 and 3 do not communicate directly. Therefore, Device 2 must act as a 'bridge'. The fol-
lowing settings should be applied:
UR IED 1:
DIRECT OUT 2 OPERAND:
DIRECT INPUT 5 DEVICE ID:
DIRECT INPUT 5 BIT NUMBER:
DIRECT INPUT 6 DEVICE ID:
DIRECT INPUT 6 BIT NUMBER:
UR IED 3:
DIRECT OUT 2 OPERAND:
DIRECT INPUT 5 DEVICE ID:
DIRECT INPUT 5 BIT NUMBER:
DIRECT INPUT 6 DEVICE ID:
DIRECT INPUT 6 BIT NUMBER:
UR IED 2:
DIRECT INPUT 5 DEVICE ID:
DIRECT INPUT 5 BIT NUMBER:
DIRECT INPUT 6 DEVICE ID:
DIRECT INPUT 6 BIT NUMBER:
DIRECT OUT 2 OPERAND:
DIRECT OUT 3 OPERAND:
DIRECT OUT 4 OPERAND:
GE Multilin
UR IED 1
Figure 5–67: THREE-TERMINAL LINE APPLICATION
is used to key the permission.
HYB POTT TX1
TX1
UR IED 1
RX1
UR IED 3
" "
HYB POTT TX1
"2"
"2" (this is a message from IED 2)
"2"
"4" (effectively, this is a message from IED 3)
" "
HYB POTT TX1
"2"
"2" (this is a message from IED 2)
"2"
"3" (effectively, this is a message from IED 1)
"1"
"2"
"3"
"2"
" "
HYB POTT TX1
" " (forward a message from 1 to 3)
DIRECT INPUT 5
" " (forward a message from 3 to 1)
DIRECT INPUT 6
B90 Low Impedance Bus Differential System
UR IED 2
UR IED 3
842713A1.CDR
RX1 RX2
UR IED 2
TX1 TX2
RX1
TX1
842714A1.CDR
5.7 INPUTS/OUTPUTS
5-139
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