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Monitoring Functions
•
Increased reliability due to monitoring of the internal measurement circuits as well as the hardware and
software
•
Monitoring of the current transformer and voltage transformer secondary circuits using sum and
symmetry supervision with optional protection function blocking
•
Broken-wire Monitoring of Voltage Transformer Circuits
•
Trip circuit monitoring possible
•
Phase rotation check.
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 definite time characteristic
•
Internal and configurable pickup and dropout delay
•
Modifiable message texts.
Synchrocheck
•
Check of the synchronism conditions or de-energized state before manual closing of the circuit breaker
•
Fast measurement of the voltage difference ΔV, the phase angle difference Δϕ and the frequency differ-
ence Δf
•
Setable minimum and maximum voltage
•
Measurement also possible via transformer without external intermediate matching transformer
•
Measuring voltages optionally phase–to–phase or phase–to–ground.
Overecxitation Protection
•
Calculation of the V/f ratio V/f
•
Adjustable warning and tripping stage
•
Standard characteristic or arbitrary trip characteristic selectable for calculation of the thermal stress.
Jump of Voltage Vector
•
Sensitive phase jump detection to be used for network disconnection.
Phase Rotation
•
Selectable ABC or ACB by setting (static) or binary input (dynamic).
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.
•
Linking of multiple devices for load restoration with prioritization of the stages
SIPROTEC 4, 7RW80, Manual
C53000-G1140-C233-4, Edition 07.2018
Introduction
1.3 Characteristics
21
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