GE G30 Instruction Manual page 463

CHAPTER 5: SETTINGS
Figure 5-162: Input and output extension via direct inputs and outputs
Assume that contact input 1 from UR IED 2 is to be used by UR IED 1. The following settings are applied (Direct Input 5 and
bit number 12 are used, as an example).
UR IED 1:
DIRECT INPUT 5 DEVICE ID
DIRECT INPUT 5 BIT NUMBER
UR IED 2:
=
DIRECT OUT 12 OPERAND
The operand of UR IED 2 is now available in UR IED 1 as
Cont Ip 1 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.
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:
: "PHASE IOC1
DIRECT OUT 3 OPERAND
UR IED 3:
: "PHASE IOC1
DIRECT OUT 3 OPERAND
UR IED 4:
: "PHASE IOC1
DIRECT OUT 3 OPERAND
UR IED 1:
: "2"
DIRECT INPUT 7 DEVICE ID
DIRECT INPUT 7 BIT NUMBER
DIRECT INPUT 7 DEFAULT STATE
G30 GENERATOR PROTECTION SYSTEM – INSTRUCTION MANUAL
= "2"
= "12"
"Cont Ip 1
On"
Figure 5-163: Sample interlocking busbar protection scheme
OP"
OP"
OP"
: "3"
: select "On" for security, select "Off" for dependability
.
DIRECT INPUT 5 ON
INPUTS/OUTPUTS
5
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