Question
Download Solution PDFIf Δ is the phase angle between supply voltage and pressure coil flux, which of the following statements is correct about the adjustable resistance used in the energy meter?
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFAdjustable Resistance in Energy Meters
- In energy meters, it is used to manage the phase relationship between the voltage and current. The adjustable resistance helps in setting this phase angle (Δ) to improve accuracy.
- Typically, this adjustment can shift the phase angle to ensure that the meter measures the power factor correctly, especially in inductive or capacitive loads.
- High Resistance for Certain Adjustments: To adjust the phase angle Δ to 0°, meaning that the voltage and current are in phase (which occurs in purely resistive loads), a high resistance is used. This allows for minimal current flow in the pressure coil circuit, helping to align the phase of the voltage and current.
- Low Resistance for Other Adjustments: Conversely, to adjust the phase angle to 90° (which corresponds to purely inductive loads), we would need a low resistance to allow maximum current through the coil.
Among the options provided, the answer provided is option 4 but option 2 can also be a correct answer.
Last updated on Jun 16, 2025
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