CHAPTER 8: AUTOMATION AUTOMATION LOGIC
D90
PLUS
LINE DISTANCE PROTECTION SYSTEM – INSTRUCTION MANUAL 483
The following logic calculates the magnitude and angle of I
1
× Z and assigns these results
to virtual analog 2 and virtual analog 3, respectively.
Figure 415: Magnitude and angle calculation logic for I
1
× Z
The following logic calculates the real and imaginary parts of the local positive-sequence
voltage and assigns these results to virtual analog 4 and virtual analog 5, respectively.
Figure 416: Real and imaginary component calculation logic for local voltage
Next, the real and imaginary components of the remote voltage are calculated and
assigned to virtual analog 6 and virtual analog 7, respectively.
Figure 417: Real and imaginary component calculation logic for remote voltage
The magnitude of the remote voltage is calculated next and assigned to virtual analog 9.
Note that virtual analog 8 is used as an intermediate value in the logic.
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