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T35 TRANSFORMER PROTECTION SYSTEM – INSTRUCTION MANUAL
INPUTS/OUTPUTS
CHAPTER 5: SETTINGS
5
DIRECT OUT 1 NAME
— This setting allows the user to assign a descriptive name to the direct output.
DIR OUT 1 OPERAND
— This sets the FlexLogic operand that determines the state of this direct output.
5.9.6.3 Application examples
The examples introduced in the earlier Direct Inputs and Outputs section (part of the Product Setup section) are continued
here to illustrate usage of the direct inputs and 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.
Figure 5-136: 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
= “2”
DIRECT INPUT 5 BIT NUMBER
= “12”
UR IED 2:
DIRECT OUT 12 OPERAND
= “
Cont Ip 1 On
”
The
Cont Ip 1 On
operand of UR IED 2 is now available in UR IED 1 as
DIRECT INPUT 5 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.
DIRECT OUT 1 OPERAND:
Off
Range: FlexLogic operand
DIRECT OUTPUT 1
EVENTS: Disabled
Range: Enabled, Disabled
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