Why must the three-phase instruments be connected correctly in the secondary circuits?
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When three-phase instruments are connected in the secondary circuits, these instruments must be connected correctly so that the proper phase relationships are maintained. If this precaution is not observed, the instrument readings will be incorrect. In checking the connections for this three-phase, three-wire metering system, note that the interconnected potential and current secondaries are both grounded to provide protection from high-voltage hazards.
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