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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)300 Hz
- d)250 Hz
Correct answer is option 'D'. Can you explain this answer?
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Verified Answer
A six-pulse thyristor bridge rectifier is connected to a balanced thre...
We know that,
For 6-pulse converter harmonic present in AC current are 6K ± 1
General expression NK ± 1 [k = 0, 1, 2, 3]
For 6 pulse n = 6
Lowest order harmonic = 5
Lower harmonic frequency = 5 × 50 = 250 Hz
For 6-pulse converter harmonic present in AC current are 6K ± 1
General expression NK ± 1 [k = 0, 1, 2, 3]
For 6 pulse n = 6
Lowest order harmonic = 5
Lower harmonic frequency = 5 × 50 = 250 Hz
Most Upvoted Answer
A six-pulse thyristor bridge rectifier is connected to a balanced thre...
Explanation:
A six-pulse thyristor bridge rectifier is a circuit that converts AC voltage to DC voltage. It consists of six thyristors arranged in a bridge configuration. The AC voltage is applied to the rectifier through a three-phase transformer. The output of the rectifier is a DC voltage that is used to power various electronic devices.
In a balanced three-phase AC source, the three phases are equal in magnitude and 120 degrees apart in phase. When the AC voltage is applied to the rectifier, the thyristors conduct in pairs, allowing the current to flow only in one direction. The DC output of the rectifier is the sum of the three-phase voltages.
Harmonic Components in AC Input Current:
The AC input current of the rectifier consists of various harmonic components. The harmonic components are integer multiples of the fundamental frequency (50 Hz). The lowest harmonic component in the AC input current is determined by the number of pulses in the rectifier.
For a six-pulse thyristor bridge rectifier, the lowest harmonic component in the AC input current is given by:
f_h = 6 * f_f
Where f_h is the frequency of the lowest harmonic component, and f_f is the fundamental frequency (50 Hz).
Substituting the values, we get:
f_h = 6 * 50 Hz = 300 Hz
Therefore, the lowest harmonic component in the AC input current of a six-pulse thyristor bridge rectifier is 300 Hz.
A six-pulse thyristor bridge rectifier is a circuit that converts AC voltage to DC voltage. It consists of six thyristors arranged in a bridge configuration. The AC voltage is applied to the rectifier through a three-phase transformer. The output of the rectifier is a DC voltage that is used to power various electronic devices.
In a balanced three-phase AC source, the three phases are equal in magnitude and 120 degrees apart in phase. When the AC voltage is applied to the rectifier, the thyristors conduct in pairs, allowing the current to flow only in one direction. The DC output of the rectifier is the sum of the three-phase voltages.
Harmonic Components in AC Input Current:
The AC input current of the rectifier consists of various harmonic components. The harmonic components are integer multiples of the fundamental frequency (50 Hz). The lowest harmonic component in the AC input current is determined by the number of pulses in the rectifier.
For a six-pulse thyristor bridge rectifier, the lowest harmonic component in the AC input current is given by:
f_h = 6 * f_f
Where f_h is the frequency of the lowest harmonic component, and f_f is the fundamental frequency (50 Hz).
Substituting the values, we get:
f_h = 6 * 50 Hz = 300 Hz
Therefore, the lowest harmonic component in the AC input current of a six-pulse thyristor bridge rectifier is 300 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)300 Hzd)250 HzCorrect answer is option 'D'. Can you explain this answer?
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