Question

series and parallel operation of thyristor in HVDC transmission results in
a)for higher voltage and power rating
b) for higher current and power rating
c)for higher voltage and current rating
d)none of these

answers Please​

Answer 1

Answer:

c is answer

Explanation:

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Answer 2

Answer:

(C)- For higher voltage and current rating

Explanation:

SCRs OR Thyristors connected in series meet high voltage demands, and SCRs connected in parallel fulfil high current demands. If all SCRs are completely utilised, these series and parallel SCR or Thyristor connections will function properly. Even though all SCRs in a string have the same rating, their V-I properties differ. As a result, they have unequal voltage or current distribution.

Series Connection: -

When the operating voltage is greater than one SCR's rating, multiple SCRs with the same rating are connected in series. As we know, even SCRs with the same rating might have distinct I-V characteristics, resulting in unequal voltage division. If two SCRs in a series can each block 5 KV, the string should be able to block 10 KV. However, in reality, this does not occur.

Parallel Connection: -

When the operating current exceeds the individual current ratings of SCRs, multiple SCRs are used in parallel. SCRs of the same rating share unequal current in a string due to differences in V-I characteristics. Assume that a string of two transistors in parallel has a current rating of 1 KA. The current through SCR1 is 1 KA for operating volume V, and the current through SCR2 is 0.8 KA, according to the V-I characteristics of the devices. As a result, SCR2 is not fully utilised in this case. The string should, however, be able to endure R KA. Theoretically, it can only handle 1.8 kilowatts. As a result, the string efficiency is equal to 90%.

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