noticed that the power limitations shown below is highly dependent on the network
impedance.
en06000322.vsd
P
Q
70º
80º
90º
IEC06000322 V1 EN
Figure 146: The complex apparent power from the generator, at different angles
δ
To prevent damages to the generator block, the generator should be tripped at low
excitation. A suitable area, in the PQ-plane, for protection operation is shown in
figure 147. In this example limit is set to a small negative reactive power independent
of active power.
1MRK 502 071-UEN - Section 8
Impedance protection
Generator protection REG670 2.2 IEC and Injection equipment REX060, REX061, REX062 283
Application manual
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