20220053 (Electrotechnics)

Course Name: Electrotechnics

Course Number: 20220053

Program: Undergraduate program

Type: Required

Credits: 3

Term Offered: Spring and Fall

Prerequisite(s): Physics, Higher Mathematics

Instructor(s): Yusheng Duan, Xiaohua Jiang, Shuiming Chen, Qinglai Guo

Textbook(s):

Yusheng Duan, Lijing He, Yandan Wang, Electrical Engineering and EDA fundamentals, Tsinghua University Press,2004~2006 (in Chinese)

Tang Qingyu, Electrical engineering and Electronics, Tsinghua University Press, 2008 (in Chinese)

Reference(s):

Qingyu Tang, Experimental instructions for Electrical Engineering and Electronics, Tsinghua University Press, 2004

Hongming Wang, Yusheng Duan, Yandan Wang, Electrical Engineering and Electronics, High Educational Press, 2009

Giorgio Rizzoni, Principles and Applications of Electrical Engineering, McGraw Hill, 2007

Allan R. Hambley, Electrical Engineering (Principles and Applications), Pearson Prentice Hall, 2005

Thomas L. Floyd, Digital Fundamentals, Science Press, 2003

Course Description:

  It is a prerequisite of Electronics (Course Number: 20220064). This course is designed to serve as a basic technical course for non-EE majors. It includes two basic areas related to electrotechnics: circuits and electro-mechanics. It includes the following topics: fundamentals of electric circuits; AC network analysis; transient analysis; three-phase circuits; Non-sinusoidal periodic current circuits; circuit simulation based on SPICE; electric machines; relay and contactor control system; programmable logic controller (PLC). Design and lab experimental exercises are also significant components of the course.

Course Objectives and Outcomes:

1.To introduce the principles of electrical and electromechanical engineering to the non-electrical-major engineering students. [1,4]

2.To present the students with circuit analytical tool and PLC programming tools, such as SPICE and Sep7-Microwin, to solve the practical problems. [3,5,11]

3.To improve the practice ability of the student by the training of laboratory and design projects. [11]

Course Topics:

1.Circuits, current and voltage. Kirchhoff current law and Kirchhoff voltage law. Node-voltage analysis method and branch-current analysis method.

2.Superposition principle. Thevenin and Norton equivalent circuits. The analysis of circuits with dependent sources and non-linear circuits.

3.Introduction of SPICE. Standard SPICE file. .OP, .DC and .TF analysis.

4.Sinusoidal current and voltage. The concept of Phasor. Complex impedances of R-L-C series circuit. Analysis of complex sinusoidal circuits. Series resonance circuit and Parallel resonance circuit. Power in AC circuits and Power factor correction. SPICE simulation of sinusoidal circuits: .AC analysis and .tran analysis.

5.Concept of non-sinusoidal periodic current circuits. Fourier series. Analysis of non-sinusoidal periodic current circuits. Effect value, averaging power and power factor in non-sinusoidal periodic current circuits. Pulse source description in SPICE. Non-linear dependent sources. .Fourier analysis in SPICE.

6.Three-phase circuit and three-phase voltage. Wye connection load and delta connection load. Three-phase power.

7.Transient analysis: switching theorems. First order circuit. Three factor method. The response of a RC circuit to a sequential pulse input. The analysis of first-order circuits with two capacitors. MULTISIM simulation.

8.Three-phase induction motor: structure and basic operation, performance characteristic, the applications of three-phase induction motors and their nameplates. Single-phase induction motor.

9.Relay and contactor control system: control devices, basic control circuits.

10.     Structure and operation of PLC. Programming method: ladder diagram and statement list. Introduction of Step-7 Microwin. PLC control system design flow and sequential function chart.

Experiment Projects:

Multimeter experiment.

Design and build a multiple-meter. Study how to calibrate the multimeter. Study the effects of a meter on the circuit.

Series resonance circuits.

Build a RLC series circuit and measure its amplitude-frequency response. Study the characteristics of the series resonance circuit. Study the effects of the device parameters on the circuit.

Three-phase circuit experiment.

Measure the three-phase voltages. Measure the voltages and currents of a wye connection load. Measure the voltages and currents of a delta connection load. Build a sequence meter and measure the sequence of the power supply.

Transient in RC circuits.

Build a first order RC circuit, study the response of the RC circuit to zero-input and step voltage input. Study the response of the RC circuit to a square wave input. Study the transient of a pulse divider. Study the transient of two parallel capacitors.

Relay and three-phase induction motor control circuits.

Start circuit of three phase induction motors. Forward and backward rotation control of three phase induction motors. Wye-delta start circuit of three phase induction motors.

Programmable logic controller applications.

Practice the use of Step7-micro/win. Programming PLC control software with step7-micro/win. Learn the structure of S7-200 PLC. Get familiar with the basic PLC instructions.

Circuit simulation with Aim-spice.

Practice the use of Aim-spice. Edit standard SPICE file of circuits and simulate the circuits.

Circuit simulation with MULTISIM.

Get familiar with the menus, toolbars and schematic capture of MULTISIM. Input and simulate circuits with MULTISIM.

Design project:

Design a traffic-light control system with S7-200 PLC.

Course Assessment:

       Homework measures, 10 points

       Quiz and simulation homework measures, 10 points.

       Experiments: 10 points.

       Final exam score, 70 points.