**KNOWARE**

**Software for
Education and Industry**

## Understanding 3 Phase Electricity

This computer program explains 3 Phase electricity in **13
interactive screens of text, graphics, and animation**.
Three phase electricity is used in virtually every electrical
power distribution system.

The program is recommended for electricians, technicians,
engineers, and anyone else who want to understand 3 phase
electricity.

Some knowledge of electrical voltage and current is assumed, and
a familiarity of 1 phase electricity is helpful but not required.

This program was written by a Professional Engineer who has
taught electrical engineering technology for 18 years. The program
is written in .html format so you can use your favorite internet
browser with hyperlinks, bookmarks, and word searches, and
requires no software installation on your computer. Just
double-click on the Table of Contents.html and your internet
browser launches the program.

**What you will learn...**

- The difference between 3 phase electricity and single phase
- What is a line and
what is a phase
- Delta and wye connections
- How to determine line
currents and phase
currents in a delta and a wye

- How to determine line
voltages and phase
voltages in a delta and a wye

- How to calculate 3 phase
power
- Where the square root of 3
comes from
- What are vectors and
phasors and why are they
important
- How 3 phase electricity is made
- What are balanced and
unbalanced loads
- What does the neutral wire
do
- Advantages of 3 phase electricity over single phase
- What phase sequence
is and why it is important
- Common 3 phase connections including delta-delta, delta-wye, and open-delta.

**Table of Contents**

**Chapter**

1.** Introduction**** **

2.** 3 Phase (vs) Single Phase Electricity**

3. **How 3 Phase Electricity is Made**

4.** Wye and Delta Loads**

5. **Phase and Line Currents and Voltages**

6. **Three Phase Power**

7. **Vectors and Phasors**

8. **Scribing out a Sinewave**

9. **Where the Square Root of 3 Comes From**

10. **The Neutral Wire**

** **

11.** ****Phase Sequence**

** **

12.** Advantages of 3 Phase Electricity**

** **

** **13.**
****Common 3 Phase Connections**

** **

** **
###

**Example screen explaining phase and line voltages and
currents**

**Example screen explaining the neutral wire**

**Example screen showing phasors
scribing out 3 phase electricity**

### Hardware/Software Requirements:

A computer with an internet browser such as Internet Explorer^{®},
Netscape^{®}, Firefox^{®}, Chrome^{®}, etc.