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In HVDC converter stations equipment using thyristor it is necessary to use a large number of thyristors in series because
- a)Current rating of thyristors are low
- b)Voltage rating of thyristors are low
- c)Thyristors always tail to an internal open
- d)None of the above
Correct answer is option 'B'. Can you explain this answer?
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Most Upvoted Answer
In HVDC converter stations equipment using thyristor it is necessary t...
Explanation:
In HVDC (High Voltage Direct Current) converter stations, thyristors are commonly used as the switching devices. Thyristors are semiconductor devices that can handle high voltages and currents. However, the voltage rating of a single thyristor is limited, and in order to handle the high voltages used in HVDC applications, a large number of thyristors need to be connected in series.
1. Voltage rating of thyristors is low:
The voltage rating of a single thyristor is typically in the range of a few kilovolts. In HVDC applications, the voltages involved can be in the range of hundreds of kilovolts or even megavolts. Therefore, a single thyristor cannot handle the high voltage levels required, and multiple thyristors need to be connected in series to achieve the desired voltage rating.
2. Current rating of thyristors is low:
Thyristors have a current rating, which is the maximum current that a thyristor can handle continuously without getting damaged. In HVDC applications, high currents are involved, and the current rating of a single thyristor may not be sufficient to handle the required current. By connecting multiple thyristors in series, the overall current handling capacity of the converter station can be increased.
3. Thyristors always tail to an internal open:
This statement is incorrect. Thyristors do not always fail due to an internal open. While thyristors can fail due to various reasons such as overvoltage, overcurrent, or excessive temperature, it is not a fundamental reason for using a large number of thyristors in series in HVDC converter stations.
Therefore, the correct answer is option 'B' - Voltage rating of thyristors are low. By connecting a large number of thyristors in series, the overall voltage rating of the converter station can be increased, allowing it to handle the high voltages involved in HVDC applications.
In HVDC (High Voltage Direct Current) converter stations, thyristors are commonly used as the switching devices. Thyristors are semiconductor devices that can handle high voltages and currents. However, the voltage rating of a single thyristor is limited, and in order to handle the high voltages used in HVDC applications, a large number of thyristors need to be connected in series.
1. Voltage rating of thyristors is low:
The voltage rating of a single thyristor is typically in the range of a few kilovolts. In HVDC applications, the voltages involved can be in the range of hundreds of kilovolts or even megavolts. Therefore, a single thyristor cannot handle the high voltage levels required, and multiple thyristors need to be connected in series to achieve the desired voltage rating.
2. Current rating of thyristors is low:
Thyristors have a current rating, which is the maximum current that a thyristor can handle continuously without getting damaged. In HVDC applications, high currents are involved, and the current rating of a single thyristor may not be sufficient to handle the required current. By connecting multiple thyristors in series, the overall current handling capacity of the converter station can be increased.
3. Thyristors always tail to an internal open:
This statement is incorrect. Thyristors do not always fail due to an internal open. While thyristors can fail due to various reasons such as overvoltage, overcurrent, or excessive temperature, it is not a fundamental reason for using a large number of thyristors in series in HVDC converter stations.
Therefore, the correct answer is option 'B' - Voltage rating of thyristors are low. By connecting a large number of thyristors in series, the overall voltage rating of the converter station can be increased, allowing it to handle the high voltages involved in HVDC applications.
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Community Answer
In HVDC converter stations equipment using thyristor it is necessary t...
Because in series connection the current is same and the voltage is divide .
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In HVDC converter stations equipment using thyristor it is necessary to use a large number of thyristors in series becausea)Current rating of thyristors are lowb)Voltage rating of thyristors are lowc)Thyristors always tail to an internal opend)None of the aboveCorrect answer is option 'B'. Can you explain this answer?
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