Section 4 Analog inputs
4.1 Introduction
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 IED has the ability to receive analog values from primary
equipment, that are sampled by Merging units (MU) connected to a
process bus, via the IEC 61850-9-2 LE protocol.
The availability of VT inputs depends on the ordered transformer
input module (TRM) type.
4.2 Setting guidelines
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
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 502 071-UEN - Section 4
Analog inputs
Generator protection REG670 2.2 IEC and Injection equipment REX060, REX061, REX062 63
Application manual
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