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Commissioning current injection
This can prevented rotating the phase the injected current 180° the off time
shown Figure 124.8
-0.
The kOhm resistor displayed Figure 126 always delivered with the cabinet.
The current injection cabinets that deliver already contain the kOhm resistor dis-
played Figure 126. This guarantees the connection with the earth potential.4
0.6
-0.6
0. Note that
when the circuit Figure 123 (with direct earthing the power auxilliary winding) used
that the earth the current injection cabinet the same connection the earth for
the PAW!
This has the advantage having higher current the frequencies that are used calcu-
late the grid parameters.
Note:
The coil's power auxiliary winding must not earthed this case.
0 100 150 200 250
-1
-0.8
1
I
/
A
t ms
.4
-0.2
0.2
0
0.
LP
I CI
U1
Une
22 kOhm
L1
L2
Figure 126: Simplified current injection diagram with only two frequencies (without Hz)
Figure 127: Example for the pulse pattern for injection without component
This activation shows that direct earth connection the P-coil's power auxiliary winding
and phase shift 180° the current injection can result increased currents (and even
short circuits). This why the coil's auxiliary winding may not directly earthed when this
method used
