A three-phase full converter supplied from a 230 V source is working as a line commutated inverter. The load consists of RLE type with R = 5 Ω, E = 200 V and L = 1 mH. A continues current of 10 A is flowing through the load, find the value of the firing angle delay.

A three-phase full converter supplied from a 230 V source is working as a line commutated inverter. The load consists of RLE type with R = 5 Ω, E = 200 V and L = 1 mH. A continues current of 10 A is flowing through the load, find the value of the firing angle delay. Correct Answer 119°

Vo = 200 – 10×5 = 150V as the circuit is operating as an inverter Vo = -150V Now, Vo = (3Vml/π) cos α α = cos-1(-150π/3√2×230) = 118.88°.
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