8.16.2 Application
Normally, the generator operates synchronously with the power system, that is, all the
generators in the system have the same angular velocity and approximately the same
phase angle difference. If the phase angle between the generators gets too large the stable
operation of the system cannot be maintained. In such a case the generator loses the
synchronism (pole slip) to the external power system.
The situation with pole slip of a generator can be caused by different reasons.
A short circuit occurs in the external power grid, close to the generator. If the fault
clearance time is too long, the generator will accelerate so much, so the synchronism
cannot be maintained. The relative generator phase angle at a fault and pole slip, relative
to the external power system, is shown in figure
232.
IEC06000313 V1 EN
Figure 232: Relative generator phase angle at a fault and pole slip relative to the
external power system
1MRK 506 369-UUS - Section 8
Impedance protection
Line distance protection REL670 2.2 ANSI 453
Application manual
To Next Page
Loading...
