Directional Overcurrent Logic; Figure 35: Directional Overcurrent Logic Diagram (Phase A Shown Only) - GE MiCOM P40 Agile Technical Manual

P14x
3.3.1

DIRECTIONAL OVERCURRENT LOGIC

IA
I>1 Current Set
IA 2H Start
I> Blocking
2 H Blocks I>1
2H 1PH BLOCK
I2H Any Start
I> Blocking
2 H Blocks I>1
2H 1PH BLOCK
Z1 LoadBlinder
Blinder Function
3Ph(based on Z 1)
I> Blocking 2
Blinder Blk I>1
Load Blinder blocking available for stages 1, 2 and 5
IA
VAB
I>1 Direction
VTS Fast Block
I> Blocking
VTS Blocks I>1
I> Char Angle
I >1 Timer Block
AR Blk Main Prot
I> Blocking
AR Blocks I>3
AR blocking available for DT-only stages

Figure 35: Directional Overcurrent Logic diagram (Phase A shown only)

Voltage Transformer Supervision (VTS) can be used to block operation of directional overcurrent elements.
This is achieved using the I>Blocking cell. When the relevant bit is set to 1, operation of the VTS will block the stage
if directionalised. When set to 0, the stage will revert to non-directional upon operation of the VTS.
P14xEd1-TM-EN-1
&
&
&
&
Directional
&
check
&
Chapter 6 - Current Protection Functions
IDMT/DT
&
Timer Settings
Notes: This diagram does not show all stages . Other stages follow
similar principles.
This diagram does not show all phases . Other phases follow
similar principles.
Load blinder functionality is only available for stages 1, 2 and 5
and on selected directional models .
AR blocking is only available for stages 3, 4 and 6
I>1 Start A
I>1 Trip A
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