1.3 Characteristics
23
7SD610 Manual
C53000-G1176-C145-4
Restricted Earth
Fault Protection
• Earth fault protection for earthed transformer windings
• Short tripping time
• High sensitivity for earth faults
• High stability against external earth faults using the magnitude and phase relation-
ship of through-flowing earth current
External Direct and
Remote Tripping
• tripping of the local end by an external device via binary input
• Tripping of the remote end by internal protection functions or by an external device
via binary input
Transmission of
Information
• Transmission of measured values from the other end of the protected object.
• Transmission of up to 4 fast commands to all remote ends (optional)
Time Overcurrent
Protection
• Selectable as emergency function during protection data communication failure or
as back-up function or as both
• Maximally two definite time stages and one inverse time stage each for phase cur-
rents and earth current
• Two directional definite time stages (DT) and one directional inverse time stage
(IDMT), each for phase currents and earth current
• for inverse time overcurrent protection a selection from various characteristics
based on several standards is possible
• Blocking capability e.g. for reverse interlocking with any element
• Instantaneous tripping by any stage when switching onto a fault
High Current
Switch-onto-Fault
Protection
• Fast tripping for all faults on 100 % line length
• Selectable for manual closure or following each closure of the circuit breaker
• With integrated line energization detection.
Automatic
Reclosure Function
(optional)
• For reclosure after single-pole, three-pole or single-pole and three-pole tripping
• Single or multiple reclosure (up to 8 reclosure attempts)
• With separate action times for every reclosure attempt, optionally without action
times
• With separate dead times after single-pole and three-pole tripping, separate for the
first four reclosure attempts
• With the option of an adaptive dead time: in this case the one device controls the
automatic reclosure cycles whilst at the other line end the automatic reclosure
solely depends on the one controlling device. The criteria used are voltage mea-
surement and/or the transmitted CLOSE command (Remote-CLOSE)
• Automatic reclosure controlled optionally by protection start with separate dead
times after single, two and three-pole starting
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