A 1-phase SCR based ac regulator is feeding power to a load consisting of 5 Ω resistance and 16mH inductance. The input supply is 230 V, 50 Hz. The maximum firing angle at which the voltage across the device becomes zero all throughout and the rms value of current through SCR, under the operating condition are
45° and 23 A
At the boundary of full conduction, α equals the load angle tan⁻¹(2π50·0.016/5)=45.15°. The load RMS current is230/√[5²+(2π50·0.016)²]=32.44 A. Each SCR conducts one half-cycle, so its full-cycle RMS is32.44/√2≈22.94 A. Thus 45°,23 A.
Important Questions from Phase Controlled Rectifiers
- Which of the following is control element in Silicon Controlled Resistor (SCR)?
A 240 V single-phase AC supply is fed to a load resistor of 100 Ω through a thyristor. If the thyristor is fired at 90°, what is the power consumed by the load?
The maximum firing angle that can be obtained by a pure resistive trigger circuit used in phase control circuit is:
In a 3-phase converter circuit, during commutation when one SCR in one phase is turned on, turning of an SCR in another phase results is:
If the input frequency of a bridge rectifier is 100 Hz, then the output frequency will be:
