7.14.8 Operation principle
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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
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Figure
222 shows a typical installation for stator injection.
1MRK 502 066-UUS B Section 7
Impedance protection
415
Technical manual
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