1 Introduction
24
7SD610 Manual
C53000-G1176-C145-4
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 com-
pounding
• Two overvoltage stages for the negative sequence voltage
• Two overvoltage stages for the zero sequence voltage or any other single-phase
voltage
• Settable drop-off to pick-up 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)
• Definite time stages for monitoring 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 imple-
mentation of user-defined logic functions
• All usual logic functions
• Time delays and limit value inquiries
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