Siemens SIPROTEC 4 7SJ61 Manual page 25

Phase Rotation
•
Selectable ABC or ACB by setting (static) or binary input (dynamic).
Circuit-Breaker Maintenance
•
Statistical methods to help adjust maintenance intervals for CB contacts according to their actual wear
•
several independent subfunctions have been implemented(ΣΙ-procedure, ΣΙ
and Ι 2 t-procedure)
•
Acquisition and conditioning of measured values for all subfunctions operates phase-selective using one
procedure-specific threshold per subfunction.
User Defined Functions
•
Freely programmable linking of internal and external signals in order to implement user-defined logic
functions
•
All standard logic functions (AND, OR, NOT, EXCLUSIVE-OR, etc.)
•
Time delays and limit value interrogations
•
Processing of measured values, including zero suppression, adding a knee curve for a transducer input,
and live-zero monitoring.
Breaker Control
•
Circuit breakers can be opened and closed via specific process control keys (models with graphic displays
only), the programmable function keys on the front panel, via the system interface (e.g. by SICAM or
SCADA), or via the front PC interface using a personal computer with DIGSI)
•
Feedback of switching states via the switch auxiliary contacts
•
Plausibility monitoring of the circuit breaker position and check of interlocking conditions.
SIPROTEC 4, 7SJ61, Manual
C53000-G1140-C210-6, Edition 05.2016
Introduction
1.3 Characteristics
-procedure, 2P-procedure
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25