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5-200 B90 LOW IMPEDANCE BUS DIFFERENTIAL SYSTEM – INSTRUCTION MANUAL

INPUTS/OUTPUTS CHAPTER 5: SETTINGS

Figure 5-111: Three-terminal line application

Assume the Hybrid Permissive Overreaching Transfer Trip (Hybrid POTT) scheme is applied using the architecture shown as

follows. The scheme output operand

HYB POTT TX1 is used to key the permission.

Figure 5-112: Single-channel open-loop configuration

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: "HYB POTT TX1"

DIRECT INPUT 5 DEVICE ID: "2"

DIRECT INPUT 5 BIT NUMBER: "2" (this is a message from IED 2)

DIRECT INPUT 6 DEVICE ID: "2"

DIRECT INPUT 6 BIT NUMBER: "4" (effectively, this is a message from IED 3)

UR IED 3:

DIRECT OUT 2 OPERAND: "HYB POTT TX1"

DIRECT INPUT 5 DEVICE ID: "2"

DIRECT INPUT 5 BIT NUMBER: "2" (this is a message from IED 2)

DIRECT INPUT 6 DEVICE ID: "2"

DIRECT INPUT 6 BIT NUMBER: "3" (effectively, this is a message from IED 1)

UR IED 2:

DIRECT INPUT 5 DEVICE ID: "1"

DIRECT INPUT 5 BIT NUMBER: "2"

DIRECT INPUT 6 DEVICE ID: "3"

DIRECT INPUT 6 BIT NUMBER: "2"

DIRECT OUT 2 OPERAND: "HYB POTT TX1"

DIRECT OUT 3 OPERAND: "DIRECT INPUT 5" (forward a message from 1 to 3)

DIRECT OUT 4 OPERAND: "DIRECT INPUT 6" (forward a message from 3 to 1)

The figure shows the signal flow among the three IEDs.

GE B90 User Manual

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