GE G60 Instruction Manual page 584

INPUTS/OUTPUTS
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
UR IED 3:
DIRECT OUT 3 OPERAND
UR IED 4:
DIRECT OUT 3 OPERAND
5
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
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.
5-370
Figure 5-217: Sample interlocking busbar protection scheme
: "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
,
DIRECT INPUT 7 ON DIRECT INPUT 8 ON
G60 GENERATOR PROTECTION SYSTEM – INSTRUCTION MANUAL
CHAPTER 5: SETTINGS
, and . Upon losing
DIRECT INPUT 9 ON