6.1.8 Monitored data
Table 500: TCSSCBR Monitored data
Name Type Values (Range) Unit Description
TCSSCBR Enum 1=on
2=blocked
3=test
4=test/blocked
5=off
Status
6.2 Current circuit supervision CCRDIF
6.2.1 Identification
Function description IEC 61850
identification
IEC 60617
identification
ANSI/IEEE C37.2
device number
Current circuit supervision CCRDIF MCS 3I MCS 3I
6.2.2 Function block
GUID-7695BECB-3520-4932-9429-9A552171C0CA V1 EN
Figure 312: Function block
6.2.3 Functionality
The current circuit supervision function CCRDIF is used for monitoring current
transformer secondary circuits.
CCRDIF 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.
CCRDIF 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.
Section 6 1YHT530004D05 D
Supervision functions
580 615 series
Technical Manual
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