Introduction
1.3 Characteristics
SIPROTEC, 7SK80, Manual
E50417-G1140-C344-A4, Release date 08.2010
26
Breaker Failure Protection 50 BF
• Checking current flow and/or evaluation of the circuit breaker auxiliary contacts;
• Initiated by the tripping of any integrated protective element that trips the circuit breaker;
• Initiation possible via a binary input from an external protective device.
Flexible Protective Functions
• Up to 20 protection functions which can be set individually to operate in three-phase or single-phase mode;
• Any calculated or directly measured value can be evaluated on principle;
• Standard protection logic with a constant (i.e. independent) characteristic curve.
• Internal and configurable pickup and dropout delay;
• Modifiable message texts.
Thermoboxes/Temperature Detection
• Detection of any ambient temperatures or coolant temperatures with the help of external thermoboxes or
internal temperature detection via the extension module I/O 2.
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 were implemented (ΣI procedure, ΣI
x
procedure, 2P procedure and I
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
• 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 manually via specific control keys, programmable function keys,
port B (e.g. by SICAM
®
or LSA), or via the operator interface (using a PC and the DIGSI
®
software).
• 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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