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A reactive energy meter, or kVArh meter, differs from an ordinary one in that its pressure circuit

  • A.is fed with a voltage in quadrature with the phase voltage
  • B.carries twice the current of an ordinary meter's pressure circuit
  • C.is connected across two lines rather than between line and neutral
  • D.contains a capacitor in place of the usual series resistance

Answer: A

Shifting the pressure circuit voltage by ninety degrees turns the cosine of the load angle into its sine, so the disc speed follows the reactive power. On a three-phase system the shift is obtained simply by connecting to the other two lines.

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