Siemens SIPROTEC 7SJ62 Manual page 31

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 (ΣI -procedure, ΣI
2
and I t-procedure);
• Acquisition and conditioning of measured values for all subfunctions operates phase-selective using one
procedure-specific threshold per subfunction.
User Defined Functions
• Internal and external signals can be logically combined to establish user-defined logic functions;
• All common Boolean operations are available for programming (AND, OR, NOT, Exclusive OR, etc.);
• Time delays and limit value interrogation;
• 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);
• Circuit breakers are monitored via the breaker auxiliary contacts;
• Plausibility monitoring of the circuit breaker position and check of interlocking conditions.
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SIPROTEC, 7SJ62/64, Manual
C53000-G1140-C207-2, Release date 01.2008
Introduction
1.3 Characteristics
x
-procedure, 2P-procedure
31