GE D30 series Instruction Manual page 347

5 SETTINGS
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 below.
Figure 5–120: 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
would trip the bus upon detecting a fault and applying a short coordination time delay.
The following settings should be applied (assume Bit 3 is used by all 3 devices to sent 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
UR IED 3:
DIRECT OUT 3 OPERAND
UR IED 4:
DIRECT OUT 3 OPERAND
UR IED 1:
DIRECT INPUT 7 DEVICE ID
DIRECT INPUT 7 BIT NUMBER
DIRECT INPUT 7 DEFAULT STATE
DIRECT INPUT 8 DEVICE ID
DIRECT INPUT 8 BIT NUMBER
DIRECT INPUT 8 DEFAULT STATE
DIRECT INPUT 9 DEVICE ID
DIRECT INPUT 9 BIT NUMBER
DIRECT INPUT 9 DEFAULT STATE
Now the three blocking signals are available in UR IED 1 as
. Upon losing communications or a device, the scheme is inclined to block (if any default state is set to "On"), or to trip
ON
the bus on any overcurrent condition (all default states set to "Off").
GE Multilin
UR IED 2 UR IED 3
: " "
PHASE IOC1 OP
: " "
PHASE IOC1 OP
: " "
PHASE IOC1 OP
: "2"
: "3"
: select "On" for security, select "Off" for dependability
: "3"
: "3"
: select "On" for security, select "Off" for dependability
: "4"
: "3"
: select "On" for security, select "Off" for dependability
D30 Line Distance Protection System
DIRECT INPUT 5 ON
UR IED 1
BLOCK
UR IED 4
842712A1.CDR
,
DIRECT INPUT 7 ON DIRECT INPUT 8 ON
5.8 INPUTS AND OUTPUTS
.
, and
DIRECT INPUT 9
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5