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Earth Fault
Protection
(optional)
Tripping/Echo at
Line Ends with
no Infeed or Weak
Infeed
External Direct and
Remote Tripping
Time Delayed
Overcurrent
Protection
7SA6 Manual
C53000-G1176-C133-1
• Differential connections (release or blocking schemes, with separate overreach
zone or directional pickup)
• Pilot protection / reverse interlocking (with direct voltage for local connections or
extremely short lines)
• All lines are suited for 2 or 3 ends;
• Phase segregated transmission applicable for lines with 2 ends
• Earth fault overcurrent protection, with a maximum of three definite time stages
(DT) and one inverse time stage (IDMT) for high resistance earth faults in earthed
systems;
• For the IDMT protection a selection of various characteristics based on several
standards is possible;
• A fourth definite time stage can be set for the IDMT
• High sensitivity from 3 mA (dependent on the version) is possible;
• Phase current stabilization against error currents during current transformer
saturation;
• Inrush stabilization with second harmonic;
• Earth fault protection with a tripping time dependent on zero sequence voltage
• Each stage can be set to be non-directional or directional in the forward or reverse
direction;
• Direction determination with zero sequence system quantities (I
sequence current and transformer star-point current (I
sequence system quantities (I
• One or more stages may function in conjunction with a signal transmission
supplement, also suited for lines with three ends
• Non-delayed tripping after switching on to a fault is possible with any stage.
• Possible in conjunction with teleprotection schemes;
• Allows fast tripping at both line ends, even if there is no or only weak infeed
available at one line end;
• Phase segregated tripping is possible.
• Tripping at the local line end from an external device via a binary input;
• Tripping of the remote line end by internal protection functions or an external device
via a binary input (with teleprotection);
• Selectable as emergency function in the case of measured voltage failure, or as
back up function independent of the measured voltage;
• Maximally two definite time stages (DT) and one inverse time stage (IDMT), each
for phase currents and earth current;
• For IDMT protection a selection from various characteristics based on several
standards is possible;
• Blocking options e.g. for reverse interlocking with any stage;
• Non-delayed tripping in the case of switching onto a fault with any stage is possible;
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