Introduction
1.3 Characteristics
SIPROTEC, 7RW80, Manual
C53000-G1140-C233-1, Release date 10.2010
21
Load Restoration
• 4 separately adjustable load restoration stages
• Individually assignable low frequency stages, which start the load restoration stage (1 to 4 for each load
restoration stage)
• Settable dropout ratio for all stages of the load restoration
• Monitoring of the settable restoration cycles (no ON/OFF chattering)
Monitoring Functions
• Reliability of the device is greatly increased because of self-monitoring of the internal measurement circuits
as well as the hardware and software.
• Monitoring the secondary circuits of voltage transformers via summation and symmetry control techniques
with optional blocking of protection function.
• Broken-wire Monitoring of Voltage Transformer Circuits
• Trip circuit monitoring
• Phase rotation check.
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.
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 difference
Δf
• Adjustable 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.
• 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.
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