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A six-pulse thyristor bridge rectifier is connected to a balanced three-phase, 50 Hz AC source. Assuming that the DC output current of the rectifier is constant, the lowest harmonic component in the AC input 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 six-pulse thyristor bridge rectifier is connected to a balanced thre...
The six-pulse thyristor bridge rectifier is a commonly used circuit for converting AC power to DC power. It consists of six thyristors arranged in a bridge configuration, which allows the current to flow in only one direction through the load. The AC input current to the rectifier is not a pure sinusoidal waveform but contains harmonics due to the non-linear nature of the thyristor switching.
In a balanced three-phase system, the AC voltage waveform is a symmetrical three-phase sinusoidal waveform with a frequency of 50 Hz. The six thyristors in the rectifier are triggered to conduct in pairs, corresponding to the positive and negative half-cycles of each phase. This results in a six-pulse waveform for the rectified current.
The lowest harmonic component in the AC input current can be determined by analyzing the Fourier series representation of the waveform. The Fourier series decomposes a periodic waveform into a sum of sinusoidal components, each with a different frequency and amplitude. The lowest harmonic component corresponds to the fundamental frequency of the waveform.
In this case, the fundamental frequency of the AC input current is 50 Hz, which is the same as the frequency of the AC source. Therefore, the lowest harmonic component in the AC input current is 50 Hz.
However, due to the non-linear characteristics of the thyristors, additional harmonics are generated. These harmonics have frequencies that are integer multiples of the fundamental frequency. In a six-pulse rectifier, the main harmonics are the 5th, 7th, 11th, 13th, etc. harmonics. The frequency of these harmonics can be calculated as follows:
Frequency of nth harmonic = n * fundamental frequency
For example, the frequency of the 5th harmonic is:
Frequency of 5th harmonic = 5 * 50 Hz = 250 Hz
Therefore, the lowest harmonic component in the AC input current of a six-pulse thyristor bridge rectifier connected to a balanced three-phase, 50 Hz AC source is 250 Hz.
In a balanced three-phase system, the AC voltage waveform is a symmetrical three-phase sinusoidal waveform with a frequency of 50 Hz. The six thyristors in the rectifier are triggered to conduct in pairs, corresponding to the positive and negative half-cycles of each phase. This results in a six-pulse waveform for the rectified current.
The lowest harmonic component in the AC input current can be determined by analyzing the Fourier series representation of the waveform. The Fourier series decomposes a periodic waveform into a sum of sinusoidal components, each with a different frequency and amplitude. The lowest harmonic component corresponds to the fundamental frequency of the waveform.
In this case, the fundamental frequency of the AC input current is 50 Hz, which is the same as the frequency of the AC source. Therefore, the lowest harmonic component in the AC input current is 50 Hz.
However, due to the non-linear characteristics of the thyristors, additional harmonics are generated. These harmonics have frequencies that are integer multiples of the fundamental frequency. In a six-pulse rectifier, the main harmonics are the 5th, 7th, 11th, 13th, etc. harmonics. The frequency of these harmonics can be calculated as follows:
Frequency of nth harmonic = n * fundamental frequency
For example, the frequency of the 5th harmonic is:
Frequency of 5th harmonic = 5 * 50 Hz = 250 Hz
Therefore, the lowest harmonic component in the AC input current of a six-pulse thyristor bridge rectifier connected to a balanced three-phase, 50 Hz AC source is 250 Hz.
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Community Answer
A six-pulse thyristor bridge rectifier is connected to a balanced thre...
- In a six-pulse thyristor bridge rectifier, the harmonics present are = 6 k ± 1
- So, the harmonics are = 5, 7, 11, 13, ...
- lowest harmonic component = 5th harmonic supply frequency = 50 Hz
- 5th harmonic frequency = 5f = 250 Hz
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A six-pulse thyristor bridge rectifier is connected to a balanced three-phase, 50 Hz AC source. Assuming that the DC output current of the rectifier is constant, the lowest harmonic component in the AC input current isa)100 Hzb)150 Hzc)250 Hzd)300 HzCorrect answer is option 'C'. Can you explain this answer?
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A six-pulse thyristor bridge rectifier is connected to a balanced three-phase, 50 Hz AC source. Assuming that the DC output current of the rectifier is constant, the lowest harmonic component in the AC input current isa)100 Hzb)150 Hzc)250 Hzd)300 HzCorrect answer is option 'C'. Can you explain this answer? for Electrical Engineering (EE) 2024 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 six-pulse thyristor bridge rectifier is connected to a balanced three-phase, 50 Hz AC source. Assuming that the DC output current of the rectifier is constant, the lowest harmonic component in the AC input 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) 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for A six-pulse thyristor bridge rectifier is connected to a balanced three-phase, 50 Hz AC source. Assuming that the DC output current of the rectifier is constant, the lowest harmonic component in the AC input current isa)100 Hzb)150 Hzc)250 Hzd)300 HzCorrect answer is option 'C'. Can you explain this answer?.
A six-pulse thyristor bridge rectifier is connected to a balanced three-phase, 50 Hz AC source. Assuming that the DC output current of the rectifier is constant, the lowest harmonic component in the AC input current isa)100 Hzb)150 Hzc)250 Hzd)300 HzCorrect answer is option 'C'. Can you explain this answer? for Electrical Engineering (EE) 2024 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 six-pulse thyristor bridge rectifier is connected to a balanced three-phase, 50 Hz AC source. Assuming that the DC output current of the rectifier is constant, the lowest harmonic component in the AC input 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) 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for A six-pulse thyristor bridge rectifier is connected to a balanced three-phase, 50 Hz AC source. Assuming that the DC output current of the rectifier is constant, the lowest harmonic component in the AC input current isa)100 Hzb)150 Hzc)250 Hzd)300 HzCorrect answer is option 'C'. Can you explain this answer?.
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A six-pulse thyristor bridge rectifier is connected to a balanced three-phase, 50 Hz AC source. Assuming that the DC output current of the rectifier is constant, the lowest harmonic component in the AC input current isa)100 Hzb)150 Hzc)250 Hzd)300 HzCorrect answer is option 'C'. Can you explain this answer?, a detailed solution for A six-pulse thyristor bridge rectifier is connected to a balanced three-phase, 50 Hz AC source. Assuming that the DC output current of the rectifier is constant, the lowest harmonic component in the AC input 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 six-pulse thyristor bridge rectifier is connected to a balanced three-phase, 50 Hz AC source. Assuming that the DC output current of the rectifier is constant, the lowest harmonic component in the AC input 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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