3410 Lab 1

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School

McNeese State University *

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Course

3410

Subject

Electrical Engineering

Date

Feb 20, 2024

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docx

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Uploaded by tchang902207

Experiment 1: Three phase system 1- Introduction: In the field of electrical power distribution, 3-phase systems play a critical role in delivering power efficiently and reliably to a wide range of consumers. This section provides an overview of the basics of 3-phase AC power. Additionally, the theoretical background on 3-phase systems, Y and Delta configurations, and their practical applications will be covered. Understanding 3- phase AC power is fundamental to comprehending the operation of electrical systems, making it an essential topic for anyone involved in electrical engineering and related fields. As such, this section will delve into the theoretical underpinnings of 3-phase systems, explaining the principles and concepts that underlie their functioning. By employing Matlab Simulink, a versatile simulation tool, you'll gain practical experience in building, analyzing, and comparing these configurations. The aim is to equip you with the knowledge and skills to measure and analyze the currents and voltages in these systems, providing insights into their operational differences and real-world applications. This manual is your step-by-step companion, from theoretical concepts to practical implementation and analysis, ensuring a comprehensive understanding of 3-phase power systems and their simulation using Matlab Simulink. 2- Theoretical Background of Y and Delta Configurations: In 3-phase systems, the Y and Delta configurations are fundamental connection methods that offer distinct characteristics and applications. Understanding the theoretical background of these configurations involves comprehending the relationship between line and phase voltages, current relationships, and power calculations for both Y and Delta setups. 2-1- Connection Methods: The Y configuration, also known as the star configuration, consists of three branches connected at a common node, resembling the shape of the letter "Y". On the other hand, the Delta configuration, or the mesh configuration, forms a closed loop in which each load or source is connected between two phases.

2-2- Line and Phase Voltages In the Y configuration, the line voltage is the voltage between any two line conductors, while the phase voltage is the voltage between any line conductor and the neutral point. In the Delta configuration, the line voltage is the phase voltage, and they are equal in magnitude but differ in phase by 120 degrees. 2-3- Current Relationships: In the Y configuration, the line current is the same as the phase current, whereas in the Delta configuration, the line current is the square root of 3 times the phase current. Understanding the theoretical aspects of Y and Delta configurations is crucial for performing manual calculations and comparing the results with simulation tools such as Matlab Simulink. This knowledge forms the foundation for creating and analyzing 3-phase systems with different load connections. For students aiming to work with Matlab Simulink for building 3-phase systems connected to loads in Y and Delta configurations, a thorough understanding of the theoretical background, practical steps, manual calculations, and result comparisons is essential.

3- Practical Steps in Matlab Simulink In this section, we will provide detailed step-by-step instructions on how to build a 3-phase system in Matlab Simulink with one load in Y configuration and another in Delta configuration. These practical steps will include creating the 3-phase system model, connecting the loads, setting up the parameters, and running simulations. Additionally, we will incorporate illustrations and screenshots to aid the understanding of the process. Step 1: Creating the 3-Phase System Model 1. Open Matlab-Simulink and create a new model. 2. Drag and drop the necessary components to represent the 3-phase system, including: Three-Phase Source, Series RLC Branch, Three-Phase V-I Measurement, Current Measurement, Scope, Powergui. 3. Connect the components to establish the 3-phase system model as shown in the Figure below.

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Step 2: Setting Up Parameters 1. Define the voltage and frequency parameters for the 3-phase source. Phase-to-phase voltage (Vrms): 400 Frequency (Hz): 60 Uncheck the internal Impedance. 2. Choose (RL) as the Branch type then specify the parameters for each branch, including resistance, inductance. Step 3: Setting Up Scopes: Set up two scopes for voltages and currents with two inputs and two layouts. Then connect the measured signals by utilizing GoTo and From . Step 4: Running Simulations 1. Configure the simulation settings, such as the duration equal to 0.1 second and set the simulation type of powergui to Discrete . 2. Run the simulation and open both scopes to observe the behavior of the 3-phase system with the Y and Delta configured loads. 4- Exercises for Hands-On Calculations: This section provides a set of exercises aimed at allowing students to apply their knowledge of 3- phase system configurations. The exercises are designed to help students troubleshoot common errors, modify parameters, add components, and analyze the system's behavior under various load conditions. 4-1: Calculate the Peak voltage. Write the formula corresponding to RMS and Peak value. 4-2: Calculate the Line-to-ground Voltage based on the Line-to-Line Voltage and write the formula.

4-3: Calculate the Line current for Y and Delta configurations. 4-4: What is the relation between Y and Delta Line Current? 5- Comparing Results from Simulink: In this section, we will compare the results obtained from the Simulink simulations with the manual calculations performed earlier for both Y and Delta configurations. Now, Run the simulation and open the scopes to compare your results with the simulation results. 5-1: Set one of the Three-phase VI measurements to show the phase-to-ground voltage. Then compare two curves with each other and your results obtained in 4-1 and 4-2. (Attach a screenshot from the scope) 5-2: Compare the two different current curves with each other and your results obtained in 4-3. ( Attach a screenshot from the scope ) 5-3: Confirm the relation between Y and Delta configuration obtained in 4-4. 5-4: How much is the phase shift between Line-to-Line and Phase current in Y connection? 5-5: How much is the phase shift between Line-to-Line and Phase current in Delta connection?