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For a three phase full controlled converter, with 3 thyristors in the upper or positive group and 3 thyristors in the lower or negative group, at any given time
- a)two thyristors are conducting from each group
- b)one thyristor is conducting from each group
- c)one thyristor is conducting from either of the groups
- d)all 6 thyristors are conducting at a time
Correct answer is option 'B'. Can you explain this answer?
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For a three phase full controlled converter, with 3 thyristors in the ...
Let’s say T1, T3 and T5 belong to the positive group and T2, T4 and T6 to the negative group. At any given time one SCR from each group conducts. e.g. T1 and T6 or T1 and T2.
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For a three phase full controlled converter, with 3 thyristors in the ...
Explanation:
In a three-phase full controlled converter, there are three thyristors in the upper or positive group and three thyristors in the lower or negative group. Each group of thyristors is responsible for controlling the current flow in one phase of the three-phase system.
At any given time, the operation of the thyristors can be categorized into three different modes:
1. Two thyristors are conducting from each group:
- In this mode, two thyristors from the upper group and two thyristors from the lower group conduct simultaneously, while the remaining thyristors are non-conducting.
- This mode is used when the converter is operating in the inverter mode, where the load is supplying power back to the source.
- The conducting thyristors provide a path for the current to flow through the load.
2. One thyristor is conducting from each group:
- In this mode, one thyristor from the upper group and one thyristor from the lower group conduct simultaneously, while the remaining thyristors are non-conducting.
- This mode is used when the converter is operating in the rectifier mode, where the source is supplying power to the load.
- The conducting thyristors provide a path for the current to flow from the source to the load.
3. One thyristor is conducting from either of the groups:
- In this mode, one thyristor from either the upper or lower group conducts, while the remaining thyristors are non-conducting.
- This mode is used during the commutation period when the conducting thyristor needs to be turned off and another thyristor needs to be turned on to maintain the current flow.
- The conducting thyristor provides a path for the current to flow, while the non-conducting thyristors are in a blocking state.
Conclusion:
Based on the modes of operation explained above, it is clear that at any given time, only one thyristor is conducting from each group. Therefore, the correct answer is option 'B' - one thyristor is conducting from each group.
In a three-phase full controlled converter, there are three thyristors in the upper or positive group and three thyristors in the lower or negative group. Each group of thyristors is responsible for controlling the current flow in one phase of the three-phase system.
At any given time, the operation of the thyristors can be categorized into three different modes:
1. Two thyristors are conducting from each group:
- In this mode, two thyristors from the upper group and two thyristors from the lower group conduct simultaneously, while the remaining thyristors are non-conducting.
- This mode is used when the converter is operating in the inverter mode, where the load is supplying power back to the source.
- The conducting thyristors provide a path for the current to flow through the load.
2. One thyristor is conducting from each group:
- In this mode, one thyristor from the upper group and one thyristor from the lower group conduct simultaneously, while the remaining thyristors are non-conducting.
- This mode is used when the converter is operating in the rectifier mode, where the source is supplying power to the load.
- The conducting thyristors provide a path for the current to flow from the source to the load.
3. One thyristor is conducting from either of the groups:
- In this mode, one thyristor from either the upper or lower group conducts, while the remaining thyristors are non-conducting.
- This mode is used during the commutation period when the conducting thyristor needs to be turned off and another thyristor needs to be turned on to maintain the current flow.
- The conducting thyristor provides a path for the current to flow, while the non-conducting thyristors are in a blocking state.
Conclusion:
Based on the modes of operation explained above, it is clear that at any given time, only one thyristor is conducting from each group. Therefore, the correct answer is option 'B' - one thyristor is conducting from each group.
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For a three phase full controlled converter, with 3 thyristors in the upper or positive group and 3 thyristors in the lower or negative group, at any given timea)two thyristors are conducting from each groupb)one thyristor is conducting from each groupc)one thyristor is conducting from either of the groupsd)all 6 thyristors are conducting at a timeCorrect answer is option 'B'. Can you explain this answer?
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