Functions
152
7SS52 V4 Manual
C53000-G1176-C182-3
Table 5-2 Alarms related to the circuit breaker status
For the treatment of the dead zone in the bus coupler and for the end fault protection,
a circuit breaker in the intermediate position causes the blocking of the end fault pro-
tection after the expiry of the monitoring delay time CB SUP TIME (6315/CU).
For low-current mode of breaker failure protection, a circuit breaker which is in the in-
termediate position is assumed to be open after the expiry of the monitoring delay time
CB SUP TIME (6315/CU). The low-current mode is not effective in this case.
For the busbar intertripping in the bus coupler bay, only the “CB OPEN“ is taken into
account in the intermediate position.
5.5.1.11 Overview of the Supervisory Functions
Table 5-3 Summary of the supervisory functions
Binary input Status of the
circuit breaker
Alarm
CB
OPEN
CB
CLOSED
CB CLOSE
command
0 0 0/1 Failure “CB fault $01”
(FNo. 176.1136/CU)
0 1 0 Closed Closed
0 1 1 Closed
by CLOSE command
“CB fault $01”
(FNo. 176.1136/CU)
1 0 0/1 Open Open
1 1 0/1 Failure “CB fault $01”
(FNo. 176.1136/CU)
Monitoring Possible cause and response
Auxiliary voltage supervision Failure of the DC-DC converter output voltag-
es
Blocking of protection and alarm
BU: (0 V)
Digit
(15 V)
Digit
CU: 15 V
24 V
"0V-superv $00" (FNo. 176.1173/CU)
"5V-superv $00" (FNo. 176.1172/CU)
"15V-superv $00" (FNo. 176.1171/CU)
Failure of the 5 V voltage causes reset of the
device failure annunciation and thus blocks the
device completely.
"15V-superv CU" (FNo. 10420/CU)
"24V-superv CU" (FNo. 10421/CU)
Failure of the 15 V or 24 V voltage of the cen-
tral unit does not block the protection.
Measured value monitoring BU
| ∆ I | > 0.2
.
I/I
N
| ∆ I | > 0.125
.
Σ | I |
Internal device error in measured value acqui-
sition
Blocking of protection and alarm
"MeasInSup $00" (FNo. 176.1175/CU)
"Meas sup BU M" (FNo. 10423/CU)
Cyclic monitoring of the
memories (BU, CU)
After three unsuccessful restart attempts the
protection is blocked.
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