Siemens SIPROTEC 7SS523 V3.2 Manual page 165

5.5.1.11 Overview of the Supervisory Functions
Tabelle 5-3 Alarms related to the circuit breaker status
Binary input
CB CB
OPEN CLOSED
0 0 0/1
0 1
0 1
1 0 0/1
1 1 0/1
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.
Tabelle 5-4 Summary of the supervisory functions
Monitoring
Auxiliary voltage supervision
BU: (0 V)
Digit
(15 V)
Digit
CU: 15 V
24 V
Measured value monitoring BU
.
I
| ∆ I | > 0.5 I/
N
.
| ∆ I | > 0.125 Σ | I |
Cyclic monitoring of the
memories (BU, CU)
Status of the
circuit breaker
CB CLOSE
command
Failure
Closed
Closed
by CLOSE command
Open
Failure
Failure of the DC-DC converter output voltag-
es
Blocking of protection and alarm
"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.
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)
After three unsuccessful restart attempts the
protection is blocked.
C53000-G1176-C182-1
Supervisory Functions
"CB fault $01"
(FNo. 176.1136/CU)
Closed
"CB fault $01"
(FNo. 176.1136/CU)
Open
"CB fault $01"
(FNo. 176.1136/CU)
Possible cause and response
7SS52 V4 Manual
Alarm
149