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Introduction
Voltage
Protection
(optional)
Fault Location
Circuit Breaker
Failure Protection
(optional)
Thermal Overload
Protection
(optional)
Analog Outputs
(optional)
User Defined Logic
Functions
1-12
• Measuring voltages optionally phase-phase or phase-earth
Overvoltage and undervoltage detection with different stages
• Two overvoltage stages for the phase-earth voltages, with common time delay
• Two overvoltage stages for the phase-phase voltages, with common time delay
• Two overvoltage stages for the positive sequence voltage, with a time delay each
• Two overvoltage stages for the negative sequence voltage, with a time delay each
• Two overvoltage stages for the zero sequence voltage or any other single-phase
voltage, with a time delay each
• Settable drop-off to pick-up ratios for the overvoltage protection functions
• Two undervoltage stages for the phase-earth voltages with common time delay
• Two undervoltage stages for the phase-phase voltages with common time delay
• Two undervoltage stages for the positive sequence voltage, with a time delay each
• Settable current criterion for undervoltage protection functions
• Initiated by trip command or reset of the fault detection;
• Computation of the distance to fault with dedicated measured value registers;
• Fault location output in ohm, kilometers or miles and % of line length;
• Parallel line compensation can be selected;
• Optional function; taking into consideration the load current in case of single-phase
earth faults fed from both sides
• Fault location output as BCD-code or analog value (dependent on the order variant)
• With independent current stages for monitoring current flow through every pole of
the circuit breaker;
• With independent monitoring time steps for single-pole and three-pole tripping;
• Start by trip command of every internal protection function;
• Start by external trip functions possible;
• Single or two stages
• Short drop off and overshoot times.
• Thermal display of ohmic loss of the protected object
• R. m. s. measurement for all three phase currents
• Settable thermal and current alarm stages
• Output of up to four analog values (dependent on the order variant) is possible:
measured values, fault location, breaking earth fault current
• Freely programmable combination of internal and external signals for the
implementation of user defined logic functions;
• All common logic functions;
7SA6 Manual
C53000-G1176-C156-2
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