Siemens SIPROTEC 7SD80 Manual page 45

Circuit-Breaker Status
Information regarding the circuit-breaker position is required by various protection and supplementary functions
to ensure their optimal functionality. The device has a circuit-breaker status recognition which processes the
status of the circuit-breaker auxiliary contacts and contains also a detection based on the measured currents
and voltages (see also Section 2.16).
In address 1130 the residual current PoleOpenCurrent is set, which will definitely not be exceeded when
the circuit-breaker pole is open. If parasitic currents (e.g. through induction) can be excluded when the circuit
breaker is open, this setting may be very sensitive. Otherwise this setting must be increased. Usually the pre-
setting is sufficient. This parameter can only be set in DIGSI at Display Additional Settings.
The seal-in time SI Time all Cl. (address 1132) determines the period of time during which the active
protection functions are enabled following each energization of the line. This time is started when the internal
switching detection function recognizes closing of the circuit breaker or if the circuit-breaker auxiliary contacts
or a binary device input signal that the circuit breaker was closed. The time must therefore be longer than the
command time of these protection functions plus a safety margin. This parameter can only be set in DIGSI at
Display Additional Settings.
In address 1134 Line Closure the criteria for the internal recognition of line energization are determined.
Only with ManCI means that only the manual close signal via binary input or the integrated control is eval-
uated as closure. I OR V or ManCl means that additionally the measured currents or voltages are used to
determine closure of the circuit breaker, whereas 52a OR I or M/C implies that either the currents or the
states of the circuit-breaker auxiliary contacts are used to determine closure of the circuit breaker. If the voltage
transformers are not arranged on the line side, the setting 52a OR I or M/C must be used. In the case of I
or Man.Close only the currents or the manual close signals are used to recognize closing of the circuit break-
er.
Before each closing detection, the circuit breaker must be recognized as being open for the settable time 1133
T DELAY SOTF.
Address 1135 Reset Trip CMD determines under which conditions a trip command is reset. If
CurrentOpenPole is set, the trip command is reset as soon as the current disappears. It is important that the
value set in address 1130 PoleOpenCurrent(see above) is undershot. If Current AND 52a is set, the
circuit-breaker auxiliary contact must send a message that the circuit breaker is open. It is a prerequisite for
this setting that the position of the auxiliary contacts is allocated via a binary input.
For special applications, in which the device trip command does not always lead to a complete cutoff of the
current, the setting Pickup Reset can be chosen. In this case, the trip command is reset as soon as the
pickup of the tripping protection function drops off and - just as with the other setting options- the minimum trip
command duration (address 240) has elapsed. The setting Pickup Reset makes sense, for instance, during
the test of the protection equipment, when the system-side load current cannot be cut off and the test current
is injected in parallel to the load current.
While the time SI Time all Cl. (address 1132, see above) is activated following each recognition of line
energization, SI Time Man.Cl (address 1150) defines the time following manual closure during which
special influence on the protection functions is activated. This parameter can only be set in DIGSI at Display
Additional Settings.
SIPROTEC, 7SD80, Manual
E50417-G1140-C474-A1, Release date 09.2011
Functions
2.1 General
45