GE B90 Instruction Manual page 339

CHAPTER 5: SETTINGS
In this architecture, Devices 1 and 3 do not communicate directly. Therefore, Device 2 must act as a 'bridge'. The following
settings are applied:
UR IEC 1:
: "HYB POTT
DIRECT OUT 2 OPERAND
: "2"
DIRECT INPUT 5 DEVICE ID
DIRECT INPUT 5 BIT NUMBER
: "2"
DIRECT INPUT 6 DEVICE ID
DIRECT INPUT 6 BIT NUMBER
UR IED 3:
: "HYB POTT
DIRECT OUT 2 OPERAND
: "2"
DIRECT INPUT 5 DEVICE ID
DIRECT INPUT 5 BIT NUMBER
: "2"
DIRECT INPUT 6 DEVICE ID
DIRECT INPUT 6 BIT NUMBER
UR IED 2:
: "1"
DIRECT INPUT 5 DEVICE ID
DIRECT INPUT 5 BIT NUMBER
: "3"
DIRECT INPUT 6 DEVICE ID
DIRECT INPUT 6 BIT NUMBER
: "HYB POTT
DIRECT OUT 2 OPERAND
: "DIRECT INPUT
DIRECT OUT 3 OPERAND
: "DIRECT INPUT
DIRECT OUT 4 OPERAND
The figure shows the signal flow among the three IEDs.
In three-terminal applications, both the remote terminals must grant permission to trip. Therefore, at each terminal, direct
inputs 5 and 6 are ANDed in FlexLogic and the resulting operand configured as the permission to trip (
setting).
B90 LOW IMPEDANCE BUS DIFFERENTIAL SYSTEM – INSTRUCTION MANUAL
TX1"
: "2" (this is a message from IED 2)
: "4" (effectively, this is a message from IED 3)
TX1"
: "2" (this is a message from IED 2)
: "3" (effectively, this is a message from IED 1)
: "2"
: "2"
TX1"
5" (forward a message from 1 to 3)
6" (forward a message from 3 to 1)
Figure 5-103: Signal flow for direct input and output
INPUTS/OUTPUTS
5
HYB POTT RX1
5-183