GE MiCOM P40 Agile Technical Manual page 458

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P44x/EN CM/Hb6

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°

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algorithms "Delta" are no longer valid).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

Troubleshooting