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1. How great is the number of pulses in the three - phase half-wave rectifier?

1. How great is the number of pulses in the three - phase half-wave rectifier?

Introductory Circuit Analysis (13th Edition)
Introductory Circuit Analysis (13th Edition)
13th Edition
ISBN:9780133923605
Author:Robert L. Boylestad
Publisher:Robert L. Boylestad
Chapter1: Introduction
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please answer this question for the the for this report Q) how great is the number of pulses in a three-phase half-wave rectifier
El . EO M1 36 151+7:13 2_5422347806918580582 - Read-only ビy Read Only - You can't save changes to... Power Electronics Lab. Experiment No. 6 جامعة بغداد كلية هندسة الخوارزمی قسم هندسة الميكاترونكس مختير ألكترونيات القدرة 3-0 half – wave uncontrolled rectifier Object: The object of this experiment is to measure the currents and voltages in the uncontrolled three- pulse half- wave rectifier with resistive load. Theory: The uncontrolled three - phase half - wave rectifier circuit is often referred to as three - pulse rectifier circuit. The input voltages UL' . ULs' have the same reference point as the output voitage Ug, namely the N conductor. The circuit setup shown in Figure (24) illustrates that current can only flow through one of the diodes when the corresponding phase voltage is greater than Ua. L1 -mmm 中 L2 mm m V3 L3 m m Is Vs RL ULT V2 ULS Figure (24) Schematic diagram of three - phase half-wave uncontrolled rectifier The voltage waveforms are shown in figure (25). The figure illustrates that the three phase voltages overlap so that every single - phase voltage is only dominant for a short time period. Since the three - phase voltages are offset exactly 120°, the "dominant phase" of a phase voltage also lasts exactly 120°. ULT - 120 . - 120 120 30 129 180 Figure (25) Voltage waveforms of a three - phase half- wave uncontrolled rectifier 24 جامعة The phase voltage Uu' is the highest voltage, related to its period, from exactly 30° to 150°. This means that the diode Vj cannot become conductive as soon as ULI' crosses the zero axis but only when ULI' is 0.7 V greater than ULs', i. e. 30° later. The diode Vj then carries the direct current L, to 150°. Then Vs takes over the current because UL2' is the highest phase voltage from 150° to 270°. From 270° to 30° again the dominant phase voltage is ULa' and diode V, carries the current Ia. Each of the مختبر -
Transcribed Image Text:El . EO M1 36 151+7:13 2_5422347806918580582 - Read-only ビy Read Only - You can't save changes to... Power Electronics Lab. Experiment No. 6 جامعة بغداد كلية هندسة الخوارزمی قسم هندسة الميكاترونكس مختير ألكترونيات القدرة 3-0 half – wave uncontrolled rectifier Object: The object of this experiment is to measure the currents and voltages in the uncontrolled three- pulse half- wave rectifier with resistive load. Theory: The uncontrolled three - phase half - wave rectifier circuit is often referred to as three - pulse rectifier circuit. The input voltages UL' . ULs' have the same reference point as the output voitage Ug, namely the N conductor. The circuit setup shown in Figure (24) illustrates that current can only flow through one of the diodes when the corresponding phase voltage is greater than Ua. L1 -mmm 中 L2 mm m V3 L3 m m Is Vs RL ULT V2 ULS Figure (24) Schematic diagram of three - phase half-wave uncontrolled rectifier The voltage waveforms are shown in figure (25). The figure illustrates that the three phase voltages overlap so that every single - phase voltage is only dominant for a short time period. Since the three - phase voltages are offset exactly 120°, the "dominant phase" of a phase voltage also lasts exactly 120°. ULT - 120 . - 120 120 30 129 180 Figure (25) Voltage waveforms of a three - phase half- wave uncontrolled rectifier 24 جامعة The phase voltage Uu' is the highest voltage, related to its period, from exactly 30° to 150°. This means that the diode Vj cannot become conductive as soon as ULI' crosses the zero axis but only when ULI' is 0.7 V greater than ULs', i. e. 30° later. The diode Vj then carries the direct current L, to 150°. Then Vs takes over the current because UL2' is the highest phase voltage from 150° to 270°. From 270° to 30° again the dominant phase voltage is ULa' and diode V, carries the current Ia. Each of the مختبر -
O 161+ 7:15 3G 36 2_5422347806918580582 - Read-only Read Only - You can't save changes to... The phase voltage ULI' is the highest voltage, related to its period, from exactly 30° to 150°. This means that the diode Vi cannot become conductive as soon as ULI' crosses the zero axis but only when ULI' is 0.7 V greater than ULs', i. e. 30° later. The diode V, then carries the direct current Ig to 150°. Then V; takes over the current because UL2' is the highest phase voltage from 150° to 270°. From 270° to 30° again the dominant phase voltage is ULs' and diode Vs carries the current Ig. Each of the diodes therefore carries the current for a third of the period duration. When a diode takes over the current, this is known as commutation. We say that the current commutates from V, to V3 at 150e. مختير - Necessary equipments: 1. Рower Board (Турс 5125). 2. 1 standard Oscilloscope with the possibility of internal triggering with the LINE trigger source. 3. 1 digital multimeter with the possibility of measuring ms values Procedure: 1. Connect the circuit shown in Figure (26) on the Power Board, as shown in Figure (27). 2. Set the switch M3/B6 at the Power Board to position M3. 3. Put the three - phase power supply into operation by connecting the bridge in the three - phase power supply. 4. Switch ON the Power Board. 5. Use the Oscilloscope to draw phase voltages ULI. UL2 and UL3, the corresponding output voltage Ua and output current Ig. 6.. Switch OFF the Power Board. RL AVs 27 L1' L2' L3' Re 0.50 Figure (26) Circuit diagrum for three - phase half- wave uncontrolled rectifier Report & Discussion: 1. How great is the number of pulses in the three - phase half - wave rectifier? 25 2 of 3
Transcribed Image Text:O 161+ 7:15 3G 36 2_5422347806918580582 - Read-only Read Only - You can't save changes to... The phase voltage ULI' is the highest voltage, related to its period, from exactly 30° to 150°. This means that the diode Vi cannot become conductive as soon as ULI' crosses the zero axis but only when ULI' is 0.7 V greater than ULs', i. e. 30° later. The diode V, then carries the direct current Ig to 150°. Then V; takes over the current because UL2' is the highest phase voltage from 150° to 270°. From 270° to 30° again the dominant phase voltage is ULs' and diode Vs carries the current Ig. Each of the diodes therefore carries the current for a third of the period duration. When a diode takes over the current, this is known as commutation. We say that the current commutates from V, to V3 at 150e. مختير - Necessary equipments: 1. Рower Board (Турс 5125). 2. 1 standard Oscilloscope with the possibility of internal triggering with the LINE trigger source. 3. 1 digital multimeter with the possibility of measuring ms values Procedure: 1. Connect the circuit shown in Figure (26) on the Power Board, as shown in Figure (27). 2. Set the switch M3/B6 at the Power Board to position M3. 3. Put the three - phase power supply into operation by connecting the bridge in the three - phase power supply. 4. Switch ON the Power Board. 5. Use the Oscilloscope to draw phase voltages ULI. UL2 and UL3, the corresponding output voltage Ua and output current Ig. 6.. Switch OFF the Power Board. RL AVs 27 L1' L2' L3' Re 0.50 Figure (26) Circuit diagrum for three - phase half- wave uncontrolled rectifier Report & Discussion: 1. How great is the number of pulses in the three - phase half - wave rectifier? 25 2 of 3
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