Siemens SIPROTEC 7SJ80

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
x
-procedure, 2P-procedure
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
•
Switching devices can be opened and closed manually using control keys, programmable function keys,
via port B (e.g. of SICAM or LSA), or via the user interface (using a personal computer and the DIGSI oper-
ating software)
•
Feedback of switching states via the switch auxiliary contacts
•
Plausibility monitoring of the circuit breaker position and check of interlocking conditions.
Introduction
1.3 Characteristics
28 SIPROTEC 4, 7SJ80, Manual
E50417-G1140-C343-A8, Edition 12.2017