GE B90 Instruction Manual page 392

INPUTS/OUTPUTS
Assume the Hybrid Permissive Overreaching Transfer Trip (Hybrid POTT) scheme is applied using the architecture shown as
follows. The scheme output operand
5
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:
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
The figure shows the signal flow among the three IEDs.
5-200
Figure 5-111: Three-terminal line application
is used to key the permission.
HYB POTT TX1
Figure 5-112: 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"
: "HYB POTT
TX1"
: "DIRECT INPUT 5" (forward a message from 1 to 3)
: "DIRECT INPUT 6" (forward a message from 3 to 1)
B90 LOW IMPEDANCE BUS DIFFERENTIAL SYSTEM – INSTRUCTION MANUAL
CHAPTER 5: SETTINGS