Introduction
1.3 Characteristics
SIPROTEC, 7SD610, Manual
C53000-G1176-C145-6, Release date 02.2011
26
Voltage Protection (optional)
• Overvoltage and undervoltage detection with different stages
• Two overvoltage stages for the phase-earth voltages
• Two overvoltage stages for the phase-phase voltages
• Two overvoltage stages for the positive sequence voltage, optionally with compounding
• Two overvoltage stages for the negative sequence voltage
• Two overvoltage stages for the zero sequence voltage or any other single-phase voltage
• Settable dropout to pickup ratios
• Two undervoltage stages for the phase-earth voltages
• Two undervoltage stages for the phase-phase voltages
• Two undervoltage stages for the positive sequence voltage
• Settable current criterion for undervoltage protection functions
Frequency Protection (optional)
• Monitoring on underfrequency (f<) and/or overfrequency (f>) with 4 frequency limits and delay times that are
independently adjustable
• Very insensitive to harmonics and abrupt phase angle changes
• Large frequency range (approx. 25 Hz to 70 Hz)
Circuit Breaker Failure Protection (optional)
• With definite time current stages for monitoring the current flow through every pole of the circuit breaker
• Separate pickup thresholds for phase and earth currents
• Independent timers for single-pole and three-pole tripping;
• Start by trip command of every internal protection function
• Start by external trip functions possible
• Single-stage or two-stage
• Short dropout and overshoot times
• End fault protection and pole discrepancy monitoring possible
Thermal Overload Protection
• Thermal replica of the current heat losses of the protected object
• R.M.S. measurement of all three phase currents
• Settable thermal and current-dependent warning stages
User-defined Logic Functions (CFC)
• Freely programmable combination of internal and external signals for the implementation of user-defined
logic functions
• All typical logic functions
• Time delays and limit value inquiries
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