GE G60 Instruction Manual page 287

5 SETTINGS
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").
EXAMPLE 2: PILOT-AIDED SCHEMES
Consider a three-terminal line protection application shown in the figure below.
Assume the Hybrid Permissive Overreaching Transfer Trip (Hybrid POTT) scheme is applied using the architecture shown
below. The scheme output operand
Figure 5–112: SINGLE-CHANNEL OPEN-LOOP CONFIGURATION
GE Multilin
: " "
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
UR IED 1
Figure 5–111: THREE-TERMINAL LINE APPLICATION
is used to key the permission.
HYB POTT TX1
TX1
UR IED 1
RX1
UR IED 3
G60 Generator Management Relay
,
DIRECT INPUT 7 ON DIRECT INPUT 8 ON
UR IED 2
UR IED 3
842713A1.CDR
RX1 RX2
UR IED 2
TX1 TX2
RX1
TX1
842714A1.CDR
5.7 INPUTS/OUTPUTS
, and
DIRECT INPUT 9
5-189
5