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A three phase fully controlled bridge converter is feeding a load drawing a constant and ripple free load current of 20 A at a firing angle of 60°. The approximate total harmonic distortion (% THD) and the rms value of fundamental component of input current will respectively
  • a)
    30.73 A, 15.6 A
  • b)
    30.73 A, 16.32 A
  • c)
    42.32 A, 15.6 A
  • d)
    42.32 A, 16.32 A
Correct answer is option 'A'. Can you explain this answer?
Verified Answer
A three phase fully controlled bridge converter is feeding a load draw...
 
Total rms current 
Fundamental current Ia1 = 0.78 × 20 = 15.6A
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A three phase fully controlled bridge converter is feeding a load draw...
Degrees. The line voltage is 400 V (phase voltage). Determine the average and RMS values of the load voltage and load power.

To find the average and RMS values of the load voltage and load power, we need to first calculate the output voltage waveform.

The output voltage waveform of a fully controlled bridge converter can be expressed as:

Vout = √2 * Vm * cos(α)

Where:
Vout = output voltage
Vm = maximum phase voltage (400 V)
α = firing angle (60 degrees)

Plugging in the values, we get:

Vout = √2 * 400 * cos(60)
Vout = √2 * 400 * 0.5
Vout = 400 V

The load voltage is equal to the output voltage, so the average and RMS values of the load voltage are both 400 V.

Next, we can calculate the load power. The load power can be expressed as:

P = Vout * Iload

Where:
P = load power
Vout = load voltage (400 V)
Iload = load current (20 A)

Plugging in the values, we get:

P = 400 * 20
P = 8000 W

Therefore, the average and RMS values of the load voltage are both 400 V, and the load power is 8000 W.
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