GE B90 Instruction Manual page 244

5.7 INPUTS/OUTPUTS
DIRECT INPUT 9 DEVICE ID
DIRECT INPUT 9 BIT NUMBER
DIRECT INPUT 9 DEFAULT STATE
Now the three blocking signals are available in UR IED 1 as
. Upon losing communications or a device, the scheme is inclined to block (if any default state is set to "On"), or to trip
ON
the bus on any overcurrent condition (all default states set to "Off").
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
5
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:
5-126
: "4"
: "3"
: select "On" for security, select "Off" for dependability
UR IED 1
Figure 5–63: THREE-TERMINAL LINE APPLICATION
is used to key the permission.
HYB POTT TX1
TX1
UR IED 1
RX1
UR IED 3
Figure 5–64: SINGLE-CHANNEL OPEN-LOOP CONFIGURATION
" "
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"
B90 Low Impedance Bus Differential System
,
DIRECT INPUT 7 ON DIRECT INPUT 8 ON
UR IED 2
UR IED 3
842713A1.CDR
RX1 RX2
UR IED 2
TX1 TX2
RX1
TX1
842714A1.CDR
5 SETTINGS
, and
DIRECT INPUT 9
GE Multilin