GE G30 Instruction Manual page 527

CHAPTER 5: SETTINGS
Assume the Hybrid Permissive Overreaching Transfer Trip (Hybrid POTT) scheme is applied using the architecture shown as
follows. The scheme output operand
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.
G30 GENERATOR PROTECTION SYSTEM – INSTRUCTION MANUAL
Figure 5-176: Three-terminal line application
is used to key the permission.
HYB POTT TX1
Figure 5-177: Single-channel open-loop configuration
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)
INPUTS/OUTPUTS
5
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