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LMRC Assistant Manager Electrical (Operations) : 2018 Paper

Option 4 : First and fourth

CT 1: Network Theory 1

11608

10 Questions
10 Marks
10 Mins

It operates in two modes.

**Rectification mode:**

α < 90°

V_{0} → positive

I_{0} → positive

**Inversion mode:**

α > 90°

V_{0} → Negative

I_{0} → positive

Average output current in rectifier always positive in inversion (α > 90°) and rectification (α < 90°) mode.

Power (P) = V_{0} I_{0}

Power is positive in rectification and power flow from source to load.

Power is negative in Inversion and power flow from load to source.

Therefore, it works in two quadrants i.e. in first and fourth quadrants.

**Important Points:**

The average output voltage of the single-phase fully controlled converter is,

\({{V}_{0}}=\frac{2{{V}_{m}}}{\pi }\cos \alpha \)

The average output voltage of the three-phase fully controlled converter is,

\({{V}_{0}}=\frac{3{{V}_{m}}}{\pi }\cos \alpha \)