Protection Functions
PRS-7367 229
The criterion for the impedance circle characteristic of the static stable boundary can be switched
on or off; When the static stable impedance circle criterion disabled, the out of step protection
transforms into a pure power factor angle criterion.
The power factor angle criterion is:
Figure 3.51-2 Schematic diagram of out of step protection action area
Out of step protection automatically disabled during motor startup and is automatically put into
operation after startup. In addition, the blocking criteria for out of step protection also include: PT
disconnection blocking, circuit breaker tripping blocking, no current blocking (Ia<0.06In and
Ic<0.06In), no voltage blocking (Uca<10V), negative sequence current blocking (can be enabled/
disabled, sharing the same negative sequence current blocking element with loss of excitation
protection, which is to automatically return after a 10 second delay).
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