P44x/EN CM/Hb6
(CM) 9-34
Figure 18: Example: ABC-limZ4 (Reverse)
VAN/IAN = Zf=Rf=20 V/0,500 mA=40 Ω=Lim Z4 with angle(VAN/IAN)=70°-180°=-110°
Note:
Figure 19: Points limit of the characteristic to be tested (with Zp selected as a
reverse zone)
Simulator use can generate transients greater than 0.2 In on currents where the
generation of a fault condition can induce errors about the directional calculation with
"Delta" algorithms. This error is due to the simulator boxes which do not always reflect
the real conditions of fault occurrence during the transient condition. To avoid this
problem during the starting zones check, we recommend inhibiting the "Delta"
algorithms in the characteristics path by setting T1 to 50 ms (beyond 40 ms,
algorithms "Delta" are no longer valid). It is the case for numerical injection boxes.
Check in the injection device, whether any possibility of DC component could be
chosen to force the start of the faulty current at 0 (If not, the model network could be
unrealistic)
Commissioning
MiCOM P40 Agile P442, P444