Introduction
1.3 Characteristics
SIPROTEC, 7SK80, Manual
E50417-G1140-C344-A5, Release date 11.2012
26
Intermittent Ground Fault Protection
• Detects and accumulates intermittent ground faults
• Tripping after configurable total time.
Directional intermittent ground fault protection
• Detects intermittent ground faults
• Direction determination
• Tripping after settable number of intermittent restrikes
Breaker Failure Protection 50 BF
• By checking the current and/or evaluating the circuit breaker auxiliary contacts
• Started by any integrated protection function that trips
• Initiation possible via a binary input from an external protective device.
Flexible Protective Functions
• Up to 20 customizable protection functions with three-phase or single-phase operation
• Any calculated or directly measured quantity can be evaluated on principle.
• Standard protection logic with a constant (i.e. definite-time) characteristic curve
• Internal and configurable pickup and dropout delay
• Modifiable message texts.
RTD box/temperature detection
• Detection of any ambient temperatures or coolant temperatures using external RTD boxes or internal tem-
perature 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 have been 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.
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