Protected Object
Line, transformer, etc
Forward
Reverse
Definition of direction
for directional functions
Measured quantity is
positive when flowing
towards the object
e.g. P, Q, I
Reverse
Forward
Definition of direction
for directional functions
e.g. P, Q, I
Measured quantity is
positive when flowing
towards the object
Set parameter
CTStarPoint
Correct Setting is
"ToObject"
Set parameter
CTStarPoint
Correct Setting is
"FromObject"
en05000456.vsd
IEC05000456 V1 EN
Figure 2:
Internal convention of the directionality in the IED
If the settings of the primary CT is correct, that is
CTStarPoint
set as
FromObject
or
ToObject
according to the plant condition, then a positive quantity always flows
towards the protected object, and a
Forward
direction always looks towards the
protected object.
The settings of the IED is performed in primary values. The ratios of the main CTs and
VTs are therefore basic data for the IED. The user has to set the rated secondary and
primary currents and voltages of the CTs and VTs to provide the IED with their rated
ratios.
The CT and VT ratio and the name on respective channel is done under
Main menu/
Hardware/Analog modules
in the Parameter Settings tool or on the HMI.
1MRK502052-UEN B
Section 3
Analog inputs
73
Technical manual
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