ABB RELION RET670, Applications Manual

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Section 4 Analog inputs
4.1 Introduction
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Analog input channels must be configured and set properly in order to get correct
measurement results and correct protection operations. For power measuring, all
directional and differential functions, the directions of the input currents must be
defined in order to reflect the way the current transformers are installed/connected in
the field ( primary and secondary connections ). Measuring and protection algorithms
in the IED use primary system quantities. Setting values are in primary quantities as
well and it is important to set the data about the connected current and voltage
transformers properly.
An AISVBAS reference PhaseAngleRef can be defined to facilitate service values
reading. This analog channel's phase angle will always be fixed to zero degrees and
remaining analog channel's phase angle information will be shown in relation to this
analog input. During testing and commissioning of the IED, the reference channel can
be changed to facilitate testing and service values reading.
The availability of VT inputs depends on the ordered transformer input
module (TRM) type.
4.2 Setting guidelines
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The available setting parameters related to analog inputs are depending
on the actual hardware (TRM) and the logic configuration made in
PCM600.
4.2.1 Setting of the phase reference channel
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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.
1MRK 504 163-UUS A
Section 4
Analog inputs
Transformer protection RET670 2.2 ANSI 69
Application manual