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
shows a typical installation for stator injection.
1MRK502052-UEN B
Section 7
Impedance protection
299
Technical manual
Summary of Contents for Relion REG670
Page 1: ...Relion 670 series Generator protection REG670 2 0 IEC Technical manual ...
Page 2: ......
Page 44: ...38 ...
Page 58: ...52 ...
Page 80: ...74 ...
Page 106: ...100 ...
Page 482: ...476 ...
Page 548: ...542 ...
Page 570: ...564 ...
Page 600: ...594 ...
Page 608: ...602 ...
Page 630: ...624 ...
Page 862: ...856 ...
Page 1094: ...1088 ...
Page 1226: ...1220 ...
Page 1250: ...1244 ...
Page 1297: ...1291 ...