LABORATORY CONTENT: 3-phase systems PRELIMINARY QUESTIONS: 1) What is the phase angle between the phases in an ideal 3-phase system? 2) Show the terms phase voltage, phase current, line voltage and line current on delta and star configurations, separately (practically, show the points where these measurements should be held using a multimeter). 3) Show the basic configurations of star-star, delta-delta, star-delta, and delta-star (draw by your hand).

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LABORATORY CONTENT: 3-phase systems
PRELIMINARY QUESTIONS:
1) What is the phase angle between the phases in an ideal 3-phase system?
2) Show the terms phase voltage, phase current, line voltage and line current on delta and star configurations, separately
(practically, show the points where these measurements should be held using a multimeter).
3) Show the basic configurations of star-star, delta-delta, star-delta, and delta-star (draw by your hand).
PRELIMINARY INFORMATION:
For star connection
Iph = IL
Vpn =
Peotal = v3 V, I, cos q = 3 Vph lpn cos o
%3D
For delta connection
Iph = 4
Vpn = V.
Protat = V3 V, I, cos o = 3 Vph lpn Cos o
EXERCISE STEPS:
1) Consider a 3-phase delta-star configuration with a generator and a 3-phase load. The generator supplies voltage of
grid-standard 380/220v@50H2. Each load is (10+8j) 0. Calculate the values given in the chart (give full formula).
Table 1. Delta-star configuration
Generator (source)
Load
Voltage
Current
Power
Voltage
Current
Power
Power
Power
Phase Line Phase Line Active Reactive Apparent factor Phase Line Phase Line
Active Reactive Apparent Factor
2) Consider the same problem with (15+15) a loads in star-delta configuration (with standard grid voltages).
a. Simulate the electrical circuit
b. Plot voltage and current signals of generator and loads (both phase and line, if possible)
C. Measure and fill the table below (miss out the non-measurable ones in the simulator). Write down the
calculations if needed.
Table 2. Star-delta configuration
Generator
Load
Voltage
Current
Power
Voltage
Current
Power
Power
Active Reactive Apparent Factor
Power
Phase Line Phase Line Active Reactive Apparent factor Phase Line Phase Line
Transcribed Image Text:LABORATORY CONTENT: 3-phase systems PRELIMINARY QUESTIONS: 1) What is the phase angle between the phases in an ideal 3-phase system? 2) Show the terms phase voltage, phase current, line voltage and line current on delta and star configurations, separately (practically, show the points where these measurements should be held using a multimeter). 3) Show the basic configurations of star-star, delta-delta, star-delta, and delta-star (draw by your hand). PRELIMINARY INFORMATION: For star connection Iph = IL Vpn = Peotal = v3 V, I, cos q = 3 Vph lpn cos o %3D For delta connection Iph = 4 Vpn = V. Protat = V3 V, I, cos o = 3 Vph lpn Cos o EXERCISE STEPS: 1) Consider a 3-phase delta-star configuration with a generator and a 3-phase load. The generator supplies voltage of grid-standard 380/220v@50H2. Each load is (10+8j) 0. Calculate the values given in the chart (give full formula). Table 1. Delta-star configuration Generator (source) Load Voltage Current Power Voltage Current Power Power Power Phase Line Phase Line Active Reactive Apparent factor Phase Line Phase Line Active Reactive Apparent Factor 2) Consider the same problem with (15+15) a loads in star-delta configuration (with standard grid voltages). a. Simulate the electrical circuit b. Plot voltage and current signals of generator and loads (both phase and line, if possible) C. Measure and fill the table below (miss out the non-measurable ones in the simulator). Write down the calculations if needed. Table 2. Star-delta configuration Generator Load Voltage Current Power Voltage Current Power Power Active Reactive Apparent Factor Power Phase Line Phase Line Active Reactive Apparent factor Phase Line Phase Line
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