Siemens 7SC80 Manual page 30

Introduction
1.3 Characteristics
Fault Location
•
Initiation by trip command, external command or dropout of pickup
•
Configuration of up to three line sections possible
•
Calculation of the fault distance and output of the fault location in ohms (primary and secondary) and in
kilometers or miles.
Breaker Failure Protection
•
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 Protection 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.
Synchrocheck
•
Verification of the synchronous conditions before reclosing after three-pole tripping
•
Fast measurement of the voltage difference ΔV, the phase angle difference Δϕ and the frequency differ-
ence Δf
•
Alternatively, check of the de-energized state before reclosing
•
Setable minimum and maximum voltage
•
Verification of the synchronous conditions or de-energized state also possible before the manual closing
of the circuit breaker, with separate limit values
•
Measurement also possible via transformer without external intermediate matching transformer
•
Measuring voltages optionally phase–to–phase or phase–to–ground.
Additional Applications with 6 Voltage Inputs
•
Applicable in 7SC803
•
Voltage protection of side 2
•
Frequency protection of side 2
•
Voltage-transformer supervision of side 2
Phase Sequence Reversal
•
Selectable ABC or ACB by setting (static) or binary input (dynamic)
Circuit-Breaker Maintenance
•
Statistical methods to help coordinate the maintenance intervals for circuit-breaker 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 in a phase-selective way
using one procedure-specific threshold per subfunction.
30
x -procedure, 2P-procedure,
SIPROTEC Compact, 7SC80, Manual
E50417-G1140-C486-A8, Edition 07.2017