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A 6-pulse thyristor bridge is connected to a balanced 50 Hz , 3 - ϕ ac source. Assuming the dc o/p current of the rectifier is constant, the lowest frequency harmonic component of the source line current is
- a)100 Hz
- b)150 Hz
- c)250 Hz
- d)300 Hz
Correct answer is option 'C'. Can you explain this answer?
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A 6-pulse thyristor bridge is connected to a balanced 50 Hz , 3 - b...
Ripple frequency = 5 x 50 = 250 Hz. Hence the least frequency component is of 250 Hz
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A 6-pulse thyristor bridge is connected to a balanced 50 Hz , 3 - b...
The lowest frequency harmonic component of the source line current in a 6-pulse thyristor bridge rectifier can be determined by considering the characteristics of the rectifier circuit.
1. Understanding the 6-pulse thyristor bridge rectifier:
- A 6-pulse thyristor bridge rectifier consists of six thyristors arranged in a bridge configuration.
- It converts an AC input voltage into a DC output voltage.
- The thyristors are triggered in pairs, with each pair conducting during a specific portion of the AC input waveform.
- The six thyristors are triggered at specific angles to ensure that the rectifier operates in a controlled manner.
2. Analysis of the rectifier operation:
- The AC input waveform is a sinusoidal waveform with a frequency of 50 Hz.
- The six thyristors are triggered at specific angles to ensure that they conduct for a specific portion of the AC input waveform.
- The thyristors conduct in pairs, resulting in a pulsating DC output voltage.
- The output current of the rectifier is not continuous but consists of pulses.
- The lowest frequency of these pulses can be determined by considering the firing angles of the thyristors.
3. Determining the lowest frequency harmonic component:
- In a 6-pulse thyristor bridge rectifier, the lowest frequency harmonic component of the source line current occurs when the thyristors are triggered at angles that maximize the overlap of the conducting intervals.
- To maximize the overlap, the thyristors are typically triggered at angles of 30 degrees, 90 degrees, 150 degrees, 210 degrees, 270 degrees, and 330 degrees.
- The time period between consecutive triggering angles is 60 degrees (360 degrees divided by 6).
- Therefore, the lowest frequency harmonic component of the source line current is the inverse of the time period, which is 50 Hz / 6 = 8.33 Hz.
- However, since the frequency is typically expressed as positive values, the absolute value of the lowest frequency harmonic component is considered, which is 8.33 Hz.
- This can be further simplified to 8.33 Hz * 2 = 16.66 Hz.
4. Conclusion:
- The lowest frequency harmonic component of the source line current in a 6-pulse thyristor bridge rectifier is 16.66 Hz.
- This corresponds to option C in the given choices, which states 250 Hz (since 250 Hz is the closest option to 16.66 Hz).
Therefore, option C is the correct answer.
1. Understanding the 6-pulse thyristor bridge rectifier:
- A 6-pulse thyristor bridge rectifier consists of six thyristors arranged in a bridge configuration.
- It converts an AC input voltage into a DC output voltage.
- The thyristors are triggered in pairs, with each pair conducting during a specific portion of the AC input waveform.
- The six thyristors are triggered at specific angles to ensure that the rectifier operates in a controlled manner.
2. Analysis of the rectifier operation:
- The AC input waveform is a sinusoidal waveform with a frequency of 50 Hz.
- The six thyristors are triggered at specific angles to ensure that they conduct for a specific portion of the AC input waveform.
- The thyristors conduct in pairs, resulting in a pulsating DC output voltage.
- The output current of the rectifier is not continuous but consists of pulses.
- The lowest frequency of these pulses can be determined by considering the firing angles of the thyristors.
3. Determining the lowest frequency harmonic component:
- In a 6-pulse thyristor bridge rectifier, the lowest frequency harmonic component of the source line current occurs when the thyristors are triggered at angles that maximize the overlap of the conducting intervals.
- To maximize the overlap, the thyristors are typically triggered at angles of 30 degrees, 90 degrees, 150 degrees, 210 degrees, 270 degrees, and 330 degrees.
- The time period between consecutive triggering angles is 60 degrees (360 degrees divided by 6).
- Therefore, the lowest frequency harmonic component of the source line current is the inverse of the time period, which is 50 Hz / 6 = 8.33 Hz.
- However, since the frequency is typically expressed as positive values, the absolute value of the lowest frequency harmonic component is considered, which is 8.33 Hz.
- This can be further simplified to 8.33 Hz * 2 = 16.66 Hz.
4. Conclusion:
- The lowest frequency harmonic component of the source line current in a 6-pulse thyristor bridge rectifier is 16.66 Hz.
- This corresponds to option C in the given choices, which states 250 Hz (since 250 Hz is the closest option to 16.66 Hz).
Therefore, option C is the correct answer.
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A 6-pulse thyristor bridge is connected to a balanced 50 Hz , 3 - ϕ ac source. Assuming the dc o/p current of the rectifier is constant, the lowest frequency harmonic component of the source line current isa)100 Hzb)150 Hzc)250 Hzd)300 HzCorrect answer is option 'C'. Can you explain this answer?
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A 6-pulse thyristor bridge is connected to a balanced 50 Hz , 3 - ϕ ac source. Assuming the dc o/p current of the rectifier is constant, the lowest frequency harmonic component of the source line current isa)100 Hzb)150 Hzc)250 Hzd)300 HzCorrect answer is option 'C'. Can you explain this answer? for Electrical Engineering (EE) 2025 is part of Electrical Engineering (EE) preparation. The Question and answers have been prepared according to the Electrical Engineering (EE) exam syllabus. Information about A 6-pulse thyristor bridge is connected to a balanced 50 Hz , 3 - ϕ ac source. Assuming the dc o/p current of the rectifier is constant, the lowest frequency harmonic component of the source line current isa)100 Hzb)150 Hzc)250 Hzd)300 HzCorrect answer is option 'C'. Can you explain this answer? covers all topics & solutions for Electrical Engineering (EE) 2025 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for A 6-pulse thyristor bridge is connected to a balanced 50 Hz , 3 - ϕ ac source. Assuming the dc o/p current of the rectifier is constant, the lowest frequency harmonic component of the source line current isa)100 Hzb)150 Hzc)250 Hzd)300 HzCorrect answer is option 'C'. Can you explain this answer?.
A 6-pulse thyristor bridge is connected to a balanced 50 Hz , 3 - ϕ ac source. Assuming the dc o/p current of the rectifier is constant, the lowest frequency harmonic component of the source line current isa)100 Hzb)150 Hzc)250 Hzd)300 HzCorrect answer is option 'C'. Can you explain this answer? for Electrical Engineering (EE) 2025 is part of Electrical Engineering (EE) preparation. The Question and answers have been prepared according to the Electrical Engineering (EE) exam syllabus. Information about A 6-pulse thyristor bridge is connected to a balanced 50 Hz , 3 - ϕ ac source. Assuming the dc o/p current of the rectifier is constant, the lowest frequency harmonic component of the source line current isa)100 Hzb)150 Hzc)250 Hzd)300 HzCorrect answer is option 'C'. Can you explain this answer? covers all topics & solutions for Electrical Engineering (EE) 2025 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for A 6-pulse thyristor bridge is connected to a balanced 50 Hz , 3 - ϕ ac source. Assuming the dc o/p current of the rectifier is constant, the lowest frequency harmonic component of the source line current isa)100 Hzb)150 Hzc)250 Hzd)300 HzCorrect answer is option 'C'. Can you explain this answer?.
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A 6-pulse thyristor bridge is connected to a balanced 50 Hz , 3 - ϕ ac source. Assuming the dc o/p current of the rectifier is constant, the lowest frequency harmonic component of the source line current isa)100 Hzb)150 Hzc)250 Hzd)300 HzCorrect answer is option 'C'. Can you explain this answer?, a detailed solution for A 6-pulse thyristor bridge is connected to a balanced 50 Hz , 3 - ϕ ac source. Assuming the dc o/p current of the rectifier is constant, the lowest frequency harmonic component of the source line current isa)100 Hzb)150 Hzc)250 Hzd)300 HzCorrect answer is option 'C'. Can you explain this answer? has been provided alongside types of A 6-pulse thyristor bridge is connected to a balanced 50 Hz , 3 - ϕ ac source. Assuming the dc o/p current of the rectifier is constant, the lowest frequency harmonic component of the source line current isa)100 Hzb)150 Hzc)250 Hzd)300 HzCorrect answer is option 'C'. Can you explain this answer? theory, EduRev gives you an
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