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T₂G DISTANCE LEARNING PROGRAM

Short Circuit Analysis

0.8 CEU / 8.0 PDH

$ 89.00

About the Course:

This course is a distance learning program designed to teach you how to perform short circuit calculations and perform equipment evaluation.  Many calculation examples are used to illustrate how to perform an analysis.   The methods are based on the IEEE Buff and Red books.  This program is recommended for personnel responsible for the specification, maintenance and operation of power distribution systems such as designers, engineers, and electricians.

Learning Outcomes:

This program will help you apply basic principles to help you:

• Understand the importance of short circuit calculations.
• Correctly apply series ratings using circuit breaker and fuses.
• Determine correct transformer, conductor and motor data for use in the calculations.
• Perform simplified as well as detailed short circuit calculations.
• Perform analysis of device interrupting ratings.

CCOURSE AGENDA

Introduction to Short Circuit Analysis

National Electrical Code Requirements

Sources of Short Circuit Current

Concepts of Short Circuit Studies

Three Phase Short Circuit Calculations
Per Phase Calculation Concepts

Symmetrical vs. Asymmetrical

X/R ratio

Conductor Impedance

Length, Size, No./Phase

Calculation Process with Conductors Example Calculation

Transformer Impedance

Percent Impedance Tests

Using %Z for Short Circuit Calculations

Source Impedance using Transformer as Base

Motor Contribution

Concept of Motor Contribution

Effect of Drives on Motor Contribution

Motor Contribution Calculations

Subtransient Reactance Xd''

Interrupting Ratings

Effect of X/R ratio

Molded Case Breakers

Low Voltage Power Circuit Breakers and ANSI C37 Multiplying Factors

Medium Voltage Breakers

Fuses
Classes of Fuses, R, J, L
Let Thru Current

Let Thru Energy

Series Ratings

Protection of Downstream Equipment

Series Ratings

Fully Rated vs. Series Rated

Example Problem