GE C30 Instruction Manual page 274

INPUTS/OUTPUTS
Example 1: Extending input/output capabilities of a UR relay
Consider an application that requires additional quantities of contact inputs or output contacts or lines of programmable
logic that exceed the capabilities of a single UR-series chassis. The problem is solved by adding an extra UR-series IED,
such as the C30, to satisfy the additional inputs/outputs and programmable logic requirements. The figure shows that two
IEDs are connected via single-channel digital communication cards.
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
5
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:
DIRECT OUT 3 OPERAND
UR IED 3:
DIRECT OUT 3 OPERAND
UR IED 4:
5-156
Figure 5-72: Input and output extension via direct inputs and outputs
UR IED 1
UR IED 2
= "2"
= "12"
= "Cont Ip 1
On"
Figure 5-73: Sample interlocking busbar protection scheme
UR IED 2 UR IED 3
: "PHASE IOC1
OP"
: "PHASE IOC1
OP"
TX1
RX1
TX1
RX1
842711A1.CDR
.
DIRECT INPUT 5 ON
UR IED 1 BLOCK
UR IED 4
842712A1.CDR
C30 CONTROLLER SYSTEM – INSTRUCTION MANUAL
CHAPTER 5: SETTINGS