Section 11 Secondary system supervision
11.1 Current circuit supervision CCSSPVC
IP14555-1 v5
11.1.1 Identification
M14870-1 v5
Function description IEC 61850
identification
IEC 60617
identification
ANSI/IEEE C37.2
device number
Current circuit supervision CCSSPVC - 87
11.1.2 Functionality
M12444-3 v10
Open or short circuited current transformer cores can cause unwanted operation of
many protection functions such as differential, earth-fault current and negative-
sequence current functions.
Current circuit supervision (CCSSPVC) compares the residual current from a three
phase set of current transformer cores with the neutral point current on a separate
input taken from another set of cores on the current transformer.
A detection of a difference indicates a fault in the circuit and is used as alarm or to
block protection functions expected to give inadvertent tripping.
11.1.3 Function block
M12436-3 v9
CCSSPVC
I3P*
IREF*
BLOCK
FAIL
ALARM
IEC13000304-1-en.vsd
IEC13000304 V1 EN-US
Figure 133: CCSSPVC function block
Signal ISIREF must be connected in the configuration.
1MRK 505 394-UEN A Section 11
Secondary system supervision
Line differential protection RED650 2.2 IEC 283
Technical manual
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