Analog Inputs; Introduction; Setting Guidelines - ABB Relion 650 Series Applications Manual

1MRK 505 287-UUS B
Section 4
4.1

Introduction

Analog input channels in the IED must be set properly in order to get correct measurement results
and correct protection operations. For power measuring and 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. Consequently the
setting values are expressed in primary quantities as well and therefore it is important to set the
transformation ratio of the connected current and voltage transformers properly.
The availability of CT and VT inputs, as well as setting parameters depends on the ordered IED.
A reference
channels phase angle will always be fixed to zero degrees and all other 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.
4.2

Setting guidelines

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
channel that is used as phase angle reference.
The initially connected phase-to-earth voltage is usually chosen as
phase voltage can also be used in theory, but a 30 degree phase shift between the current and
voltage is observed in this case.
If no suitable voltage is available, the initially connected current channel can be used. Although the
phase angle difference between the different phases will be firm, the whole system will appear to
rotate when observing the measurement functions.
4.2.2 Relationships between setting parameter Base Current, CT rated
primary current and minimum pickup of a protection IED
Note that for all line protection applications the parameter Base Current (i.e. IBase setting in the
IED) used by the relevant protection function, shall always be set equal to the largest rated CT
Busbar protection REB650
Application manual

Analog inputs

PhaseAngleRef must be defined to facilitate service values reading. This analog
The phase reference does not work if the current channel is not available. For
example, when the circuit breaker is opened and no current flows. Although the
phase angle difference between the different phases is firm, the whole system
appears to be rotating when the measurement functions are observed.
© Copyright 2013 ABB. All rights reserved
PhaseAngleRef defines the analog
PhaseAngleRef . A phase-to-
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Section 4
Analog inputs
SEMOD55003-5 v10
SEMOD55068-1 v1
SEMOD130348-4 v4
SEMOD55055-5 v3
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