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 In a three-phase, three-pulse, M-3 type controlled converter T1 starts to conduct at 30 + n°. At what angles do T2 and T3 start to conduct? Assume that the conduction sequence is T1-T2-T3.
  • a)
    2n° and 3n°
  • b)
    150 + n° and 270 + n°
  • c)
    n° each
  • d)
    30 + n° and 60 + n°
Correct answer is option 'B'. Can you explain this answer?
Verified Answer
In a three-phase, three-pulse, M-3 type controlled converter T1 starts...
In three-phase three pulse converter the conduction can start only after 30°. As each SCR conducts from 120°, T2 would conduct on 30+120+n° = 150+n° and so on.
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In a three-phase, three-pulse, M-3 type controlled converter T1 starts...
In a three-phase, three-pulse, M-3 type controlled converter, T1 starts to conduct at 30 degrees.

The M-3 type controlled converter is a type of three-phase rectifier circuit that uses three thyristors in each phase to achieve three-pulse output. The thyristors are controlled to turn on at specific angles of the input voltage waveform to control the rectified output voltage.

In this case, T1 starts to conduct at 30 degrees. This means that T1 is triggered to turn on when the input voltage waveform reaches 30 degrees. When T1 conducts, it allows current to flow through it, rectifying a portion of the input waveform. The other two thyristors in the phase, T2 and T3, will also be triggered at different angles to complete the three-pulse output.

By controlling the firing angles of the thyristors, the output voltage waveform of the converter can be controlled. This allows for efficient control of power flow in applications such as motor drives and power supplies.
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In a three-phase, three-pulse, M-3 type controlled converter T1 starts to conduct at 30 + n°. At what angles do T2 and T3 start to conduct? Assume that the conduction sequence is T1-T2-T3.a)2n° and 3n°b)150 + n° and 270 + n°c)n° eachd)30 + n° and 60 + n°Correct answer is option 'B'. Can you explain this answer?
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