Question
Download Solution PDFWhich connection method is correct when using a CT and PT with a wattmeter?
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFConstruction 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.
- CT is connected in series with the wattmeter current coil, and PT is connected in parallel with the voltage coil.
- Both transformers step down the high voltage and current values to a value measurable by the voltage and current coils of the wattmeter.
- 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.
Last updated on Jun 16, 2025
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