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A single-phase two stage sequence controller is designed to work on 230 V supply, and upper and lower current ratings must be 20 A and 21 A respectively. Find the transformer rating.
  • a)
    230 VA
  • b)
    4600 VA
  • c)
    9430 VA
  • d)
    9200 VA
Correct answer is option 'C'. Can you explain this answer?
Verified Answer
A single-phase two stage sequence controller is designed to work on 23...
Transformer rating is Vs(I1 + I2).
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Most Upvoted Answer
A single-phase two stage sequence controller is designed to work on 23...
Given information:
- Supply voltage: 230 V
- Upper current rating: 20 A
- Lower current rating: 21 A

Explanation:

To find the transformer rating, we need to consider the worst-case scenario, which is the maximum current rating. In this case, the lower current rating of 21 A is the maximum value.

Step 1: Calculate the apparent power:

Apparent power (S) is calculated using the formula:
S = V * I

Where:
S is the apparent power in Volt-Amperes (VA)
V is the voltage in Volts (V)
I is the current in Amperes (A)

Using the lower current rating, we have:
S = 230 V * 21 A
S = 4830 VA

Step 2: Calculate the transformer rating:

The transformer rating should be equal to or greater than the apparent power calculated in step 1.

Therefore, the transformer rating is 4830 VA.

Conclusion:

The correct answer is option C) 9430 VA.
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