P
70º
80º
90º
Underexcitation Protection
Operation area
IEC06000450-2-en.vsd
Q
IEC06000450 V2 EN-US
Figure 147: Suitable area, in the PQ-plane, for protection operation
Often the capability curve of a generator describes also low excitation capability of the
generator, see figure
148.
1MRK 502 071-UUS A Section 8
Impedance protection
Generator protection REG670 2.2 ANSI and Injection equipment REX060, REX061, REX062 305
Application manual
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