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