GE D90 Plus - Page 494

484 D90
PLUS
LINE DISTANCE PROTECTION SYSTEM – INSTRUCTION MANUAL
AUTOMATION LOGIC CHAPTER 8: AUTOMATION
Figure 418: Remote voltage magnitude calculation logic
Now that the remote voltage magnitude has been calculated, the following logic
calculates the voltage difference between this and the setting voltage.
Figure 419: Voltage difference automation logic
The current on each phase is checked to ensure that it is less than the maximum allowable
for a tap changer operation.
Figure 420: Overcurrent check automation logic
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