Functions
156
7SS52 V4 Manual
C53000-G1176-C182-3
CB supervision
time
Use parameter CB SUP TIME (6315/CU) to set the threshold for the circuit breaker
runtime. If no final position checkback signal is received for the circuit breaker after
this time, the protection assumes this circuit breaker to be faulty and issues an alarm.
This threshold is determined by the longest circuit breaker runtime to be expected.
ISOL TIME The parameter ISOL TIME (6301/CU) is used to set the threshold for the isolator
runtime monitoring. If no final position checkback signal is received for an isolator after
this time, the protection assumes the isolator to be faulty and issues an alarm.
This threshold is determined by the longest isolator runtime to be expected.
ISOL DC FAIL The parameter ISOL DC FAIL (6303/CU) is used to choose the isolator status which
will be assumed by the isolator replica if the auxiliary voltage for the isolator status
checkback signal has failed.
With setting OLD the old status will be assumed.
With setting ON the isolator will be assumed to be CLOSED.
ISOL ST 1/1 The parameter ISOL ST 1/1 (6304/CU) is used to choose the isolator status which
will be assumed if the checkback signal is not plausible (at the same time OPEN and
CLOSED).
With setting OLD the old status will be assumed.
With setting ON the isolator will be assumed to be CLOSED.
ISOL Malfunct The parameter ISOL Malfunct (6302/CU) is used to select the response of the pro-
tection to isolator malfunctions (runtime or plausibility error, auxiliary voltage failure).
With setting alarm only isolator malfunctions will only lead to the output of an alarm.
The protection will not be blocked.
With setting blocking isolator malfunctions will lead to the output of an alarm and to
a blocking of the protection system as set in the parameter BLOCKING MODE (6305/
CU). The blocking is automatically cleared as soon as the isolator malfunction has
been eliminated.
With setting block./release isolator malfunctions will lead to the output of an
alarm and to a blocking of the protection system as set in the parameter BLOCKING
MODE (6305/CU). The blocking will be maintained until the malfunction has been elim-
inated and the blocking has been selectively reset by the operator input ”
Reset IsoMa-
lBl”
or via the binary input ">Reset IsoMalBl" (BI FNo. 7/CU).
With setting block./acknow. isolator malfunctions will lead to the output of an alarm
and to a blocking of the protection system as set in the parameter BLOCKING MODE
(6305/CU). The blocking will be cancelled even if the malfunction persists if it has
been selectively reset by the operator input ”Reset IsoMalBl” or via the binary input
">Reset IsoMalBl" (BI FNo. 7/CU). In this case a warning "IsoProhib/fault"
(FNo. 10470/CU) will be output.
The entry in the operational event buffer will reflect the actual presence of the isolator
malfunction.
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