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Which of the below mentioned converter can operate in both 3-pulse and 6-pulse modes?
- a)3-phase half wave controller
- b)3-phase full converter
- c)3-phase semi-converter
- d)None of the mentioned
Correct answer is option 'C'. Can you explain this answer?
Verified Answer
Which of the below mentioned converter can operate in both 3-pulse and...
Semi-converters can operate in 6-pulse modes gating the SCRs at appropriate intervals.
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Which of the below mentioned converter can operate in both 3-pulse and...
Answer:
A 3-phase semi-converter is the converter that can operate in both 3-pulse and 6-pulse modes. Let's understand why this is the correct answer.
Explanation:
1. 3-phase half wave controller:
A 3-phase half wave controller is a single-phase controlled rectifier used for converting AC voltage to DC voltage. It can only operate in half-wave mode and cannot be used in both 3-pulse and 6-pulse modes. Therefore, option 'a' is incorrect.
2. 3-phase full converter:
A 3-phase full converter is a six-pulse converter that converts AC voltage to DC voltage. It operates by using six thyristors in a bridge configuration. It cannot operate in both 3-pulse and 6-pulse modes simultaneously. Therefore, option 'b' is incorrect.
3. 3-phase semi-converter:
A 3-phase semi-converter is a converter that can operate in both 3-pulse and 6-pulse modes. It consists of three thyristors connected in a bridge configuration. In the 3-pulse mode, only one thyristor conducts during each half-cycle of the input AC waveform, resulting in a 3-pulse output. In the 6-pulse mode, two thyristors conduct during each half-cycle, resulting in a 6-pulse output. The mode of operation can be switched by controlling the firing angles of the thyristors. Therefore, option 'c' is correct.
4. None of the mentioned:
This option is incorrect as a 3-phase semi-converter can operate in both 3-pulse and 6-pulse modes.
Therefore, the correct answer is option 'C' - 3-phase semi-converter.
A 3-phase semi-converter is the converter that can operate in both 3-pulse and 6-pulse modes. Let's understand why this is the correct answer.
Explanation:
1. 3-phase half wave controller:
A 3-phase half wave controller is a single-phase controlled rectifier used for converting AC voltage to DC voltage. It can only operate in half-wave mode and cannot be used in both 3-pulse and 6-pulse modes. Therefore, option 'a' is incorrect.
2. 3-phase full converter:
A 3-phase full converter is a six-pulse converter that converts AC voltage to DC voltage. It operates by using six thyristors in a bridge configuration. It cannot operate in both 3-pulse and 6-pulse modes simultaneously. Therefore, option 'b' is incorrect.
3. 3-phase semi-converter:
A 3-phase semi-converter is a converter that can operate in both 3-pulse and 6-pulse modes. It consists of three thyristors connected in a bridge configuration. In the 3-pulse mode, only one thyristor conducts during each half-cycle of the input AC waveform, resulting in a 3-pulse output. In the 6-pulse mode, two thyristors conduct during each half-cycle, resulting in a 6-pulse output. The mode of operation can be switched by controlling the firing angles of the thyristors. Therefore, option 'c' is correct.
4. None of the mentioned:
This option is incorrect as a 3-phase semi-converter can operate in both 3-pulse and 6-pulse modes.
Therefore, the correct answer is option 'C' - 3-phase semi-converter.
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