ABB RELION 620 Series Technical Manual page 892

Section 6
Supervision functions
6.3
6.3.1
6.3.2
6.3.3
6.3.4
886
Advanced current circuit supervision for transformers
CTSRCTF
Identification
Function description
Advanced current circuit supervision for
transformers
Function block
GUID-6EDF2732-697A-4770-AF30-A957E20E7054 V1 EN
Figure 464: Function block
Functionality
The advanced current circuit supervision for transformers function CTSRCTF is used
for monitoring the current transformer secondary circuit where a separate reference
current transformer input for comparison is not available or where a separate voltage
channel for calculating or measuring the zero-sequence voltage is not available.
CTSRCTF can be used for detecting the single-phase failure on the current
transformer secondary for protection application involving two or three sets of the
three-phase current transformers.
CTSRCTF detects a fault in the measurement circuit and issues an alarm which can be
used for blocking the protection functions, for example, differential protection, to
avoid unwanted tripping.
CTSRCTF is internally blocked in case of a transformer under no-load condition or if
a current in any one phase exceeds the set maximum limit.
Operation principle
The function can be enabled and disabled with the Operation setting. The
corresponding parameter values are "On" and "Off".
IEC 61850 IEC 60617
identification identification
CTSRCTF MCS 3I, I2
1MRS757644 F
ANSI/IEEE C37.2
device number
MCS 3I, I2
620 series
Technical Manual