Setting Of Current Channels; Example 1 - Hitachi Relion 670 Series Applications Manual
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Section 4
Analog inputs
4.2.2
Setting of current channels
The direction of a current to the IED is depending on the connection of the CT. Unless indicated
otherwise, the main CTs are supposed to be star connected and can be connected with the earthing
point to the object or from the object. This information must be set in the IED. The convention of the
directionality is defined as follows: A positive value of current, power, and so on means that the
quantity has the direction into the object and a negative value means direction out from the object.
For directional functions the direction into the object is defined as Forward and the direction out from
the object is defined as Reverse. See Figure
A positive value of current, power, and so on (forward) means that the quantity flows towards the
object. A negative value of current, power, and so on (reverse) means that the quantity flows away
from the object. See Figure 8.
Definition of direction
for directional functions
Reverse
Set parameter
CTStarPoint
Correct Setting is
"ToObject"
IEC05000456 V1 EN-US
Figure 8:
With correct setting of the primary CT direction, CTStarPoint set to FromObject or ToObject, a
positive quantities always flowing towards the protected object and a direction defined as Forward
always is looking towards the protected object. The following examples show the principle.
4.2.2.1
Example 1
Two IEDs used for protection of two objects.
46
Forward
Protected Object
Line, transformer, etc
e.g. P, Q, I
Measured quantity is
positive when flowing
towards the object
Internal convention of the directionality in the IED
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8
Definition of direction
for directional functions
Forward
e.g. P, Q, I
Measured quantity is
positive when flowing
towards the object
1MRK506375-UEN Rev. N
SEMOD55055-16 v6
Reverse
Set parameter
CTStarPoint
Correct Setting is
"FromObject"
en05000456.vsd
SEMOD55055-23 v6
Railway application RER670
Application manual
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