Working of Six Phase Half Wave Uncontrolled Rectifier

• The connection diagram for six phase half wave uncontrolled rectifier is shown in the figure A. 
• The primary winding of the transformer is connected in delta whereas the secondary winding consists of center taped star winding. 
• The point N is common point at which the center tap of each winding is connected. 
• The voltage across R phase, Y phase and B phase are 120^o phase displacement with each other whereas the voltage across R and R’, Y and Y’ and B and B’ is 180^o.

         

Working

• The waveform of the six phase and conduction of diodes are shown in the figure B.

Point a 

• The voltage of the phase Y’ becomes maximum with respect to other phases therefore the diode D6 conducts and current flows through path phase Y’ – D6 – Load – N.

Point B 

• The voltage of the phase R becomes maximum with respect to other phases therefore the diode D1 conducts and current flows through path phase R – D1 – Load – N.

Point C 

• The voltage of the phase B’ becomes maximum with respect to other phases therefore the diode D2 conducts and current flows through path phase B’ – D2 – Load – N. 
• Similarly the diode D3, D4 and D5 conducts for specific time interval.

Features

• Each diode conducts only for positive half cycle.
• Each diode conducts for 60^o duration
• Low ripple factor
• The average DC output voltage and current suppy to the load is higher than that of three phase half wave rectifier.
• The zig – zag connection in the secondary of the transformer is used in order to reduce DC saturation of the core.

SIX PHASE HALF WAVE UNCONTROLLED 
RECTIFIER.PDF

SIX PHASE HALF WAVE UNCONTROLLED 
RECTIFIER WAVEFORMS.PDF

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