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THREE-PHASE SEMI CONVERTER

AIM:

To study the waveforms for three phase semiconverter with RLE load.

APPARATUS REQUIRED:

Sl.No. Item Specification Qantit!

1 SCR SN 106

! "ower diode #N $001 $

% C &otor'Separately e(cited) 1 *+ 1

$ CR, - 1

- read /oard - 1

6 phaseTrierin *it 1

THEOR":

iure 1 shows the circuit diaram of three phase semi converter supplyin an R2L2E load.The

output voltaes voacross load terminals is controlled /y varyin the firin anles of SCRs T13T!

and T.The diodes %13%! and % provide merely a return path for the current to the most

neative line terminal.iure ! shows voltae and current waveforms for a 2phase

semiconverter for different firin anles 4t any instant thyristor connected to most positive line

terminal and diode connected to most neative line terminal conducts.or 05578 each diode

and thyristor conducts for !78 radians.Thefree wheelin diode does not conduct for 978!.Thefree wheelin diode conducts for 786 radians in each pulse when :78!.or ;78!3 when output

voltae tends to /ecome neative free wheelin diode /ecome forward /iased which maue feature of wor

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CONNECTION DIAGRAM:

Figure 1:Connection diagram for 3 phase semi converter with RLE load.

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WAVEFORM:

iur

e !B@oltae and current waveforms for a 2phase semiconverter for different firin anles.

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Figure 3:Waveforms of 3 phase semi converter when !"# radians.

Figure $:Waveforms of 3 phase semi converter when !"% radians.

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RESULT:

Connections were made as given in the diagram and the wave forms were

o&served in the CR'.