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CHAPTER 5: SETTINGS INPUTS/OUTPUTS

D30 LINE DISTANCE PROTECTION SYSTEM – INSTRUCTION MANUAL 5-311

DIRECT INPUT 5 DEVICE ID = “2”

DIRECT INPUT 5 BIT NUMBER = “12”

UR IED 2:

DIRECT OUT 12 OPERAND = “Cont Ip 1 On”

The Cont Ip 1 On operand of UR IED 2 is now available in UR IED 1 as

DIRECT INPUT 5 ON.

Example 2: Interlocking busbar protection

A simple interlocking busbar protection scheme can be accomplished by sending a blocking signal from downstream

devices, say 2, 3 and 4, to the upstream device that monitors a single incomer of the busbar, as shown in the figure.

Figure 5-180: Sample interlocking busbar protection scheme

Assume that Phase Instantaneous Overcurrent 1 is used by Devices 2, 3, and 4 to block Device 1. If not blocked, Device 1

trips the bus upon detecting a fault and applying a short coordination time delay.

The following settings are applied (assume Bit 3 is used by all 3 devices to send the blocking signal and Direct Inputs 7, 8,

and 9 are used by the receiving device to monitor the three blocking signals).

UR IED 2:

DIRECT OUT 3 OPERAND: "PHASE IOC1 OP"

UR IED 3:

DIRECT OUT 3 OPERAND: "PHASE IOC1 OP"

UR IED 4:

DIRECT OUT 3 OPERAND: "PHASE IOC1 OP"

UR IED 1:

DIRECT INPUT 7 DEVICE ID: "2"

DIRECT INPUT 7 BIT NUMBER: "3"

DIRECT INPUT 7 DEFAULT STATE: select "On" for security, select "Off" for dependability

DIRECT INPUT 8 DEVICE ID: "3"

DIRECT INPUT 8 BIT NUMBER: "3"

DIRECT INPUT 8 DEFAULT STATE: select "On" for security, select "Off" for dependability

DIRECT INPUT 9 DEVICE ID: "4"

DIRECT INPUT 9 BIT NUMBER: "3"

DIRECT INPUT 9 DEFAULT STATE: select "On" for security, select "Off" for dependability

Now the three blocking signals are available in UR IED 1 as

DIRECT INPUT 7 ON, DIRECT INPUT 8 ON, and DIRECT INPUT 9 ON. Upon losing

communications or a device, the scheme is inclined to block (if any default state is set to “On”), or to trip the bus on any

overcurrent condition (all default states set to “Off”).

Example 3: Pilot-aided schemes

Consider a three-terminal line protection application shown in the following figure.

GE D30 User Manual

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