Three phases and six pulse diode rectifier.

  Lab Title:           Three phases and six pulse diode rectifier.

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Objective:       To become familiar with three phase, six pulse diode rectifier.

Apparatus:

        i.            Power diode

     ii.            Voltage Source

   iii.            Resistors (220 ohm)

   iv.            Inductor (0.8H)

     v.            Voltmeters and Ammeters

   vi.            Connection cables

vii.             LV-DAC software for analysis.

Introduction:

We are using 3-phase supply with six diodes.Two diodes will be active during each phase input.For three phase 360 degree sinusoidal signal ,during interval 0-30 D3 and D5 will be active.In interval 30-90 D1 and D5 will be forward biased.During 90-150 D1 and D6 are forward biased.D2 and D6 are active during 150-210 interval.D2 and D4 are active during 210-270 interval.D3 and D4 shows conduction in interval 270-330.In interval 330-360 D3 and D5 will show conduction. 

Procedure:

·        Install the power supply, the resistive loads, the DC voltmeter/ammeter and the power diodes module in the workstation.

·        Make sure that the main power switch of the power supply is set to 0. Set the voltage control knob to 0. Connect the power supply to a three-phase wall receptacle.

·        Plug the Power supply line cord into a wall receptacle.  Set the rocker switch of the power supply to the 1(on position).

·        Make sure that the toggle switches on the resistive Load are all set to the 0.

·        In the last observe the three phase waveform, and measure the output parameters.

Circuit diagram: (Resistive Load)

Output Waveforms in case of Resistive Load :-

Circuit diagram: (Inductive Load)

Output Waveforms in case of Inductive Load :-

Conclusion:

In this lab,we see that using 3-phase rectifier we are going towards more efficiency and output current becomes more smooth.Our aim is to achieve more efficient and stable system and we do this by using just simple power diodes.