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Schering's bridge is used to measure

  • A.capacitance and dissipation factor at high voltage
  • B.the inductance and quality factor of an iron cored coil at power frequency
  • C.the frequency of an alternating supply of unknown and possibly varying frequency
  • D.the resistance of an earth electrode without disturbing its connection to the system

Answer: A

It is the standard bridge for insulation testing, giving both the capacitance of a specimen and its loss tangent at a test voltage of many kilovolts. The loss tangent is the more valuable figure, since it rises long before insulation actually fails.

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