7.14.8
Operation principle
GUID-44EDCD0D-7F1A-4C1C-ABC0-4981B9C29CE5 v1
The protection function is based on signal injection into a stator winding. These square wave
signals are generated in a separate injection unit REX060.
The injection signals are connected to the stator winding via:
•
secondary winding of a voltage transformer (VT) located at the stator neutral point
•
open delta winding of a three-phase VT set located at generator terminals
•
secondary winding of a distribution transformer (DT) located at the stator neutral point; note
that REX062 is typically required for such arrangement
•
open delta winding of a three-phase grounding transformer (GT) located at generator
terminals; note that REX062 is typically required for such arrangement
In the REX060 unit the injection voltage and current signals are amplified to a level adapted to the
analogue voltage inputs of IED. In IED the measured signals are processed and evaluation will give
detection of stator faults.
7.14.8.1
Configuration principle
GUID-3C798590-3890-4C53-A58A-0CA91094C350 v1
Figure
shows a typical installation for stator injection.
1MRK 502 066-UUS B
Section 7
Impedance protection
415
Technical manual
Содержание Relion 670 series
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