7.9.9 Operation principle
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.
7.9.9.1 Configuration principle
Figure
133 shows a typical installation for stator injection.
1MRK502052-UEN B Section 7
Impedance protection
299
Technical manual
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