Question:
The instantaneous voltage wave-form of a 3-\(\phi\) fully controlled rectifier with R-L load is more negative and less positive when the firing angle ‘α’ lies between
The instantaneous voltage wave-form of a 3-\(\phi\) fully controlled rectifier with R-L load is more negative and less positive when the firing angle ‘α’ lies between
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In 3-\(\phi\) full converters with R-L loads, more negative voltage appears for higher firing angles beyond 120°.
Updated On: May 23, 2025
- 150$^\circ$ and 180$^\circ$
- 60$^\circ$ and 90$^\circ$
- 90$^\circ$ and 120$^\circ$
- 120$^\circ$ and 150$^\circ$
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The Correct Option is D
Solution and Explanation
In a 3-phase fully controlled rectifier with an R-L load:
- As the firing angle \( \alpha \) increases, the average output voltage decreases.
- Beyond \( \alpha = 120^\circ \), the output voltage waveform starts including more negative portions due to delayed conduction.
- Between \( 120^\circ \) and \( 150^\circ \), the waveform becomes more negative and less positive.
- As the firing angle \( \alpha \) increases, the average output voltage decreases.
- Beyond \( \alpha = 120^\circ \), the output voltage waveform starts including more negative portions due to delayed conduction.
- Between \( 120^\circ \) and \( 150^\circ \), the waveform becomes more negative and less positive.
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