1MAC050144-MB C
Section 6
Supervision functions
615 series ANSI
439
Technical Manual
6.2.8
Monitored data
Table 381: TCM Monitored data
6.3
Current circuit supervision CCM
6.3.1
Identification
6.3.2
Function block
Figure 232:
Function block
6.3.3
Functionality
The current circuit supervision function CCM is used for monitoring current transformers.
CCM calculates internally the sum of phase currents (I_A, I_B and I_C) and compares the
sum against the measured single reference current (I_REF). The reference current must
originate from other three-phase CT cores than the phase currents (I_A, I_B and I_C) and
it is to be externally summated, that is, outside the IED.
CCM detects a fault in the measurement circuit and issues an alarm or blocks the
protection functions to avoid unwanted tripping.
It must be remembered that the blocking of protection functions at an occurring open CT
circuit means that the situation remains unchanged and extremely high voltages stress the
secondary circuit.
6.3.4
Operation principle
The function can be enabled and disabled with the
Operation
setting. The corresponding
parameter values are Enable and Disable.
Name
Type
Values (Range)
Unit
Description
TCM
Enum
1=enabled
2=blocked
3=test
4=test/blocked
5=disabled
Status
Function description
IEC 61850
identification
IEC 60617
identification
ANSI/IEEE C37.2
device number
Current circuit supervision
CCRDIF
MCS 3I
CCM
Summary of Contents for 615 Series ANSI
Page 1: ...Relion Protection and Control 615 series ANSI Technical Manual ...
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Page 29: ...1MAC050144 MB C Section 615 series ANSI 22 Technical Manual ...
Page 389: ...Section 4 1MAC050144 MB C Protection functions 382 615 series ANSI Technical Manual ...
Page 485: ...Section 6 1MAC050144 MB C Supervision functions 478 615 series ANSI Technical Manual ...
Page 635: ...Section 10 1MAC050144 MB C Other functions 628 615 series ANSI Technical Manual ...
Page 711: ...Section 16 1MAC050144 MB C Glossary 704 615 series ANSI Technical Manual ...
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