Preprocessing Blocks; Phase Current Preprocessing Iltctr - ABB RELION REX640 Technical Manual

1MRS759142 F
3.17

Preprocessing blocks

3.17.1

Phase current preprocessing ILTCTR

3.17.1.1 Identification
Function description
Phase current preprocessing
3.17.1.2 Function block
Figure 88: Function block
3.17.1.3 Functionality
The phase current preprocessing function ILTCTR is used for setting up the three
phase current measurement channels. The input channels for ILTCTR are either
physical hardware or IEC 61850-9-2 sampled value channels. The output I3P
channel of ILTCTR can be connected to different applications which require 3 phase
current and positive- and negative-sequence current. The output IRES_CLC can be
connected to functions using the calculated residual current.
The current transducer selection can be made by setting
"Current trafo" for conventional CT or to "Current sensor" for current sensor type.
The sensor's or the CT's primary rated current can be set using
setting. The setting
secondary winding. This is used as a reference to scale the measurements
accordingly. These settings also affect the scaling of the calculated residual current.
Current magnitude correction of an external CT can be made using settings
Amplitude Corr A , Amplitude Corr B and Amplitude Corr C .
Current angle correction of an external CT can be made using settings
Angle Corr B and Angle Corr C .
Rated secondary Val setting defines the ratio for sensor use. This value multiplied
by the
nominal voltage corresponding to the sensors' primary rated current.
Reverse polarity setting is used to reverse the polarity of phase CTs.
REX640
Technical Manual
Secondary current defines the nominal current of the CT's
Rated frequency setting (under Configuration > System) gives the sensor's
IEC 61850 IEC 60617
identification identification
ILTCTR ILTCTR
Basic functions
ANSI/IEEE C37.2
device number
ILTCTR
Current input type to
Primary current
Angle Corr A ,
191