Setting Of The Phase Reference Channel; Example; Setting Of Current Channels; Example 1 - ABB RET650 Applications Manual

Section 4
Analog inputs
4.2.1
4.2.1.1
4.2.2
4.2.2.1
38

Setting of the phase reference channel

All phase angles are calculated in relation to a defined reference. An appropriate
analog input channel is selected and used as phase reference. The parameter
PhaseAngleRef defines the analog channel that is used as phase angle reference.

Example

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 4.
Definition of direction
for directional functions
Reverse Forward
e.g. P, Q, I
Measured quantity is
positive when flowing
towards the object
Set parameter
CTStarPoint
Correct Setting is
"ToObject"
IEC05000456 V1 EN-US
Figure 4: Internal convention of the directionality in the IED
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.

Example 1

Two IEDs used for protection of two objects.
Protected Object
Line, transformer, etc
Transformer protection RET650 2.2 IEC
1MRK 504 169-UEN A
SEMOD55055-5 v3
SEMOD55055-11 v5
SEMOD55055-16 v6
4
Definition of direction
for directional functions
Forward Reverse
e.g. P, Q, I
Measured quantity is
positive when flowing
towards the object
Set parameter
CTStarPoint
Correct Setting is
"FromObject"
en05000456.vsd
SEMOD55055-23 v6
Application manual