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Emerson DeltaV A6500-UM with factory sealed box
The measuring principle for determining the direction is based on phase angle measurement and
therefore also on coincidence time measurement between current and voltage. Since the necessary
phase voltage for determining the direction is frequently not available in the event of a fault,
whichever line-to-line voltage follows the faulty phase by 90° is used as the reference voltage for
the phase current.
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