![background image](http://html.mh-extra.com/html/abb/relion-670-series-reg670/relion-670-series-reg670_applications-manual_4795313.webp)
The straight line in the PQ-diagram will be equivalent with a circle in the impedance
plane, see figure
. In this example the circle is corresponding to constant Q, that is,
characteristic parallel with P-axis.
R
X
Underexcitation
Protection Operation area
en06000452.vsd
IEC06000452 V2 EN-US
Figure 149:
The straight line in the PQ-diagram is equivalent with a circle in the
impedance plane
LEXPDIS (40) in the IED is realised by two impedance circles and a directional
restraint possibility as shown in figure
1MRK 502 071-UUS A
Section 8
Impedance protection
Generator protection REG670 2.2 ANSI and Injection equipment REX060, REX061, REX062
307
Application manual
Summary of Contents for RELION 670 SERIES REG670
Page 1: ...RELION 670 SERIES Generator protection REG670 Version 2 2 ANSI Application manual ...
Page 2: ......
Page 44: ...38 ...
Page 66: ...60 ...
Page 102: ...96 ...
Page 200: ...194 ...
Page 442: ...436 ...
Page 486: ...480 ...
Page 508: ...502 ...
Page 514: ...508 ...
Page 524: ...518 ...
Page 658: ...652 ...
Page 736: ...730 ...
Page 774: ...768 ...
Page 828: ...822 ...
Page 829: ...823 ...