Siemens siprotec 7SA6 User Manual

Introduction
1-10
7SA6 Manual
C53000-G1176-C156-2
• 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;
− Communication between devices via dedicated communication connections (in
general optical fibre) or a communication system possible (as an option);
− Steady monitoring of the communication ways and the signal propagation delay
with automatic re-adjustment.
Earth Fault
Protection
(optional)
• 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
0
,U
0
), with zero
sequence current and transformer star-point current (I
0
,I
Y
). or with negative
sequence system quantities (I
2
,U
2
);
• 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.
Transmission of
Information (only
with Digital
Protection Data
Transmission)
• Transmission of the measured values from all ends of the protected object;
• Transmission of 4 commands at all remote ends;
• Transmission of 24 additional binary signals to all remote ends.
Tripping/Echo at
Line Ends with
No or Weak Infeed
• 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.
External Direct and
Remote Tripping
• 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).

Siemens siprotec 7SA6 Specifications

General

Brand	Siemens
Model	siprotec 7SA6
Category	Relays
Language	English