R
X
Underexcitation
Protection Operation area
en06000452.vsd
IEC06000452 V2 EN
Figure 149: The straight line in the PQ-diagram is equivalent with a circle in the
impedance plane
LEXPDIS in the IED is realised by two impedance circles and a directional restraint
possibility as shown in figure 150.
Section 8 1MRK 502 071-UEN -
Impedance protection
286 Generator protection REG670 2.2 IEC and Injection equipment REX060, REX061, REX062
Application manual
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