Section 13 Secondary system supervision
13.1 Current circuit supervision CCSSPVC
13.1.1 Identification
Function description IEC 61850
identification
IEC 60617
identification
ANSI/IEEE C37.2
device number
Current circuit supervision CCSSPVC - 87
13.1.2 Functionality
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.
It must be remembered that a blocking of protection functions at an occurrence of open
CT circuit will mean that the situation will remain and extremely high voltages will
stress the secondary circuit.
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.
13.1.3 Function block
CCSSPVC
I3P*
IREF*
BLOCK
FAIL
ALARM
IEC13000304-1-en.vsd
IEC13000304 V1 EN
Figure 285: CCSSPVC function block
Signal IREF must be connected in the configuration.
1MRK502052-UEN B Section 13
Secondary system supervision
603
Technical manual
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