ABB RELION REX640 Technical Manual page 1352

Supervision functions
6.8.10 Technical data
Table 1302: MSVPR Technical data
Characteristic
Operation accuracy
Reset time
Reset ratio
Operate time accuracy in definite time mode ±1.0 % of the set value or ±20 ms
6.9 Current circuit supervision for transformers
CTSRCTF (ANSI CCM 3I,I2)
6.9.1 Identification
Function description
Current circuit supervision for trans-
formers
6.9.2 Function block
Figure 768: Function block
6.9.3 Functionality
The 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.
1352
Value
Depending on the frequency of the measured
voltage:
20 Hz < f ≤ 70 Hz: ±1.5 % of the set value or
±0.002 × U
n
10 Hz < f ≤ 20 Hz: ±4.0 % of the set value or
±0.002 × U
n
Typically 40 ms
Typically 1.04
IEC 61850 IEC 60617
identification identification
CTSRCTF MCS 3I,I2
1MRS759142 F
ANSI/IEEE C37.2
device number
CCM 3I,I2
REX640
Technical Manual