Section 13
Secondary system supervision
13.1
Current circuit supervision (87)
IP14555-1 v5
13.1.1
Identification
M14870-1 v5
Function description
IEC 61850
identification
IEC 60617
identification
ANSI/IEEE C37.2
device number
Current circuit supervision
CCSSPVC
-
87
13.1.2
Functionality
M12444-3 v10
Open or short circuited current transformer cores can cause unwanted operation of many
protection functions such as differential, ground-fault current and negative-sequence current
functions.
Current circuit supervision (CCSSPVC, 87) 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
M12436-3 v8
CCSSPVC (87)
I3P*
IREF*
BLOCK
FAIL
ALARM
ANSI13000304-1-en.vsd
ANSI13000304 V1 EN-US
Figure 387: CCSSPVC (87) function block
Signal IREF must be connected in the configuration.
1MRK 502 066-UUS B
Section 13
Secondary system supervision
727
Technical manual
Summary of Contents for Relion 670 series
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