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lab_electrical_engineering:3_rectifier:three-phase_ac [2026/04/03 02:07] – [The Three-Phase Midpoint Circuit] mexleadminlab_electrical_engineering:3_rectifier:three-phase_ac [2026/04/06 20:10] (current) – mexleadmin
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 **Warning: There is a risk of short circuit!** **Warning: There is a risk of short circuit!**
  
-Sketch the voltages $U_{\rm 1}$, $U_{\rm 2}$ and $U_{\rm 3}$ using the oscilloscope. Enter all three line-to-neutral voltages into a single screen image and use a different color for each external conductor. Also label the waveforms with the corresponding voltages. To do this, measure $U_{\rm 1}$ and $U_{\rm 2}$ as well as $U_{\rm 1}$ and $U_{\rm 3}$ simultaneously. State the oscilloscope settings you used. \\ +Sketch the voltages $U_{\rm 1}$, $U_{\rm 2}$ and $U_{\rm 3}$ using the oscilloscope. Enter all three line-to-neutral voltages into a single screen image and use a different color for each external conductor. Also label the waveforms with the corresponding voltages. To do this, measure $U_{\rm 1}$ and $U_{\rm 2}$ as well as $U_{\rm 1}$ and $U_{\rm 3}$ simultaneously. State the oscilloscope settings you used.  
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 <wrap left> <wrap left>
-{{drawio>Fig-5_V3-Screen-image-rectifier-wo-capacitor>.svg}}\\+{{drawio>Fig-5_V3-Screen-image-rectifier-wo-capacitor>.svg}}
 <imgcaption Fig-15_V3-Screen-image-three-phase-network> | Screen image of the three-phase-network> </imgcaption>  <imgcaption Fig-15_V3-Screen-image-three-phase-network> | Screen image of the three-phase-network> </imgcaption> 
 </wrap> </wrap>
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 ~~PAGEBREAK~~ ~~CLEARFIX~~ ~~PAGEBREAK~~ ~~CLEARFIX~~
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 Draw now the phasor diagram of the voltages $U_{\rm L1-N}$, $U_{\rm L2-N}$ and $U_{\rm L3-N}$. Then complete your phasor diagram with the line-to-line voltages $U_{\rm L1-L2}$, $U_{\rm L2-L3}$ and $U_{\rm L3-L1}$. How large are these voltages? Draw now the phasor diagram of the voltages $U_{\rm L1-N}$, $U_{\rm L2-N}$ and $U_{\rm L3-N}$. Then complete your phasor diagram with the line-to-line voltages $U_{\rm L1-L2}$, $U_{\rm L2-L3}$ and $U_{\rm L3-L1}$. How large are these voltages?
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-{{drawio>Fig-16_V3-Phasor-diagram-three-phase network>.svg}}\\+{{drawio>Fig-16_V3-Phasor-diagram-three-phase network>.svg}}
 <WRAP centeralign> <imgcaption Fig-16_V3-Phasor-diagram-three-phase network> | Phasor diagram of the three-phase-network> </imgcaption> </WRAP>  <WRAP centeralign> <imgcaption Fig-16_V3-Phasor-diagram-three-phase network> | Phasor diagram of the three-phase-network> </imgcaption> </WRAP> 
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 === The Three-Phase Midpoint Circuit === === The Three-Phase Midpoint Circuit ===
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 The circuit shown in <imgref Fig-17_V3-three-phase-midpoint-circuit> is a three-phase midpoint circuit. Build this three-phase rectifier circuit on the breadboard. \\ The circuit shown in <imgref Fig-17_V3-three-phase-midpoint-circuit> is a three-phase midpoint circuit. Build this three-phase rectifier circuit on the breadboard. \\
 **Warning: Pay attention not to include to short circuits via the oscilloscope GND when building the circuit!** **Warning: Pay attention not to include to short circuits via the oscilloscope GND when building the circuit!**
 \\ \\
-{{drawio>Fig-17_V3-three-phase-midpoint-circuit>.svg}}\\+{{drawio>Fig-17_V3-three-phase-midpoint-circuit>.svg}}
 <WRAP centeralign> <imgcaption Fig-17_V3-three-phase-midpoint-circuit> | Three-phase midpoint circuit> </imgcaption> </WRAP>  <WRAP centeralign> <imgcaption Fig-17_V3-three-phase-midpoint-circuit> | Three-phase midpoint circuit> </imgcaption> </WRAP> 
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 ${\rm ................................................................................................}$ \\ \\ ${\rm ................................................................................................}$ \\ \\
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 +\\ 
  
 === The Three-Phase Bridge Rectifier Circuit === === The Three-Phase Bridge Rectifier Circuit ===
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 Build the three-phase bridge rectifier circuit shown in <imgref Fig-18_V3-three-phase-bridge-rectifier-circuit> and enter the rectified voltage and the current into <imgref Fig-18_V3-three-phase-bridge-rectifier-circuit>. \\ **Warning: Pay attention to short circuits when building the circuit!** Build the three-phase bridge rectifier circuit shown in <imgref Fig-18_V3-three-phase-bridge-rectifier-circuit> and enter the rectified voltage and the current into <imgref Fig-18_V3-three-phase-bridge-rectifier-circuit>. \\ **Warning: Pay attention to short circuits when building the circuit!**
-\\+\\ \\ \\
 {{drawio>Fig-18_V3-three-phase-bridge-rectifier-circuit>.svg}}\\ {{drawio>Fig-18_V3-three-phase-bridge-rectifier-circuit>.svg}}\\
 <WRAP centeralign> <imgcaption Fig-18_V3-three-phase-bridge-rectifier-circuit> | Three-phase bridge rectifier circuit> </imgcaption> </WRAP>  <WRAP centeralign> <imgcaption Fig-18_V3-three-phase-bridge-rectifier-circuit> | Three-phase bridge rectifier circuit> </imgcaption> </WRAP> 
 \\ \\
 Connect the oscilloscope so that the voltage after the three-phase bridge can be measured. Sketch the oscilloscope screen image, s. <imgref Fig-19_V3-Screen-image-three-phase-bridge-rectifier-circuit> and label the waveforms with the corresponding voltages. Give the oscilloscope settings used. Connect the oscilloscope so that the voltage after the three-phase bridge can be measured. Sketch the oscilloscope screen image, s. <imgref Fig-19_V3-Screen-image-three-phase-bridge-rectifier-circuit> and label the waveforms with the corresponding voltages. Give the oscilloscope settings used.
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 <wrap left> <wrap left>
 {{drawio>Fig-5_V3-Screen-image-rectifier-wo-capacitor>.svg}}\\ {{drawio>Fig-5_V3-Screen-image-rectifier-wo-capacitor>.svg}}\\
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 **Warning: When using an electrolytic capacitor (Elko) the correct polarity must be observed!** **Warning: When using an electrolytic capacitor (Elko) the correct polarity must be observed!**
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-\\+\\ \\ \\ \\ \\ \\ 
 <wrap left> <wrap left>
 {{drawio>Fig-5_V3-Screen-image-rectifier-wo-capacitor>.svg}}\\ {{drawio>Fig-5_V3-Screen-image-rectifier-wo-capacitor>.svg}}\\