GE D90 Plus - Page 223

CHAPTER 7: PROTECTION GROUPED PROTECTION ELEMENTS
D90
PLUS
LINE DISTANCE PROTECTION SYSTEM – INSTRUCTION MANUAL 213
Figure 189: Effect of blinders on the mho operating characteristic
Figure 190: Power swing detect quadrilateral operating characteristic
The FlexLogic output operands for the power swing detect element are as follows.
Power swing detection operands
POWER SWING 50DD............................... Asserted when the power swing detection element detects a
disturbance other than a power swing.
$&'5
5
;
$&'5
5
)RUZDUG
5&$
;
,QQHU/HIW
%OLQGHU
0LGGOH/HIW
%OLQGHU
2XWHU/HIW
%OLQGHU
,QQHU5LJKW
%OLQGHU
0LGGOH5LJKW
%OLQGHU
2XWHU5LJKW
%OLQGHU
5HYHUVH
5HDFK
4XDGULODWHUDO
5HYHUVH0LGGOH
4XDGULODWHUDO
5HYHUVH2XWHU
)RUZDUG5HDFK
4XDGULODWHUDO)RUZDUG0LGGOH
4XDGULODWHUDO)RUZDUG2XWHU