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You are extending the range of a wattmeter. How will you connect the primary of the potential transformer?

You are extending the range of a wattmeter. How will you connect the primary of the potential transformer? Correct Answer Parallel to the line

Extension of Range of Wattmeter :

  • By using a current and potential transformer in conjunction with a wattmeter, high power measurements can be done.
  • The current and potential transformers are connected between the line and current and voltage coils of a wattmeter respectively.

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  • It can be seen that the voltage and current transformers are to be used along with the wattmeter for the measurement of power.
  • The primary of the current transformer (CT) is connected in series with the line and the secondary of the CT is connected to the current coil of the wattmeter through an ammeter.
  • Similarly, the primary of the potential transformer (PT) is connected in parallel to the line and the secondary is connected to the voltage coil of the wattmeter through a voltmeter.
  • Both transformers step down the high voltage and current values to a value measurable by the voltage and current coils of the wattmeter.
  • By knowing the transformation ratios of CT and PT, the power to the load can be determined.
  • In order to extend the range of the wattmeter, many current transformers and potential transformers of varied ratios are to be used along with the current and voltage coils of the wattmeter respectively. Thereby, a single wattmeter can cover a wide range of power measurements.

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