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The secondary of a current transformer must never be left open circuited because

  • A.the primary current would rise to an unlimited value in the system
  • B.the winding would be destroyed by the circulating current within it
  • C.the core would be permanently demagnetised and the ratio lost
  • D.the core saturates and a dangerous voltage appears

Answer: D

With no secondary current to oppose it the whole primary current becomes exciting current. The core is driven far into saturation, the flux waveform becomes peaky and the induced secondary voltage may reach thousands of volts, endangering both the insulation and the operator.

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