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Objectives
  Review of distribution system analysis topics, including
 short-circuit, protective device coordination, equipment
evaluation and arc flash hazard analysis
Analysis of a sample electrical distribution system using the
PTW software
Discussion of short-circuit and coordination analysis results
Discussion of arc flash hazard analysis results and methods
used
to reduce the hazard to below 40 cal/cm2
Provide practical examples of analysis from typical Industrial
and Commercial power systems with explanations of study
results and how they are presented in a final report
Discuss issues and examine study results and
potential problem areas
Discuss compliance with various standards
Prerequisites Basic computer skills
SKM Power*Tools Standard 3-Day and Advanced 2-Day
Training, OR Hands-On 2- Day Training, OR working
knowledge of SKM PTW Software
Students are urged to review:
• IEEE Red Book Std 141-1993, chapter 4
• IEEE Buff Book Std 242-2001, chapters 9, 10 & 11
• IEEE 1584 2002/2004a, Guide for Performing Arc Flash
Hazard Analysis
• NFPA 70E-2004 Standard for Electrical Safety
in the Workplace
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Course DescriptionThe course involves the application of the Power*Tools program to analyze a sample electrical distribution system. Short-circuit, protective device coordination, equipment evaluation and arc flash hazard analysis will be reviewed and then performed using the software. Students will earn 2.0 CEUs for this 2-day course.
Target AudienceThis course is intended for electric power engineers responsible for the design and analysis of three phase electrical distribution systems. A basic understanding of electrical distribution system analysis is required.
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Typical Industrial and Commercial Power System Example
 Review of distribution system analysis topics including
short-circuit, protective device coordination, equipment evaluation
and arc flash hazard analysis
Discussion of compliance with various standards and requirements
Input data requirement
Discussion of considerations when selecting equipment
Output data requirement
Examination and interpretation of PTW study results and potential
problem areas in the power system
Discussion of equipment evaluation results
Discussion of arc flash hazard analysis results and methods used
to reduce the hazard to below 40 cal/cm2
Discussion of final presentation of study reports
Discussion of methods and procedures on completing a
typical study
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Hands-On Lab - Analysis of a Sample Electrical
Distribution System in PTW
Equipment datasheet explanations
Input data requirement - Per unit method, Comprehensive Fault
and ANSI method, 3P, SLG, LL, and LLG Faults, Interrupting
Rating, Close-Latch Rating, and Test X/R
Relationship between Short Circuit results and Equipment Sizing
Interpretation of PTW Equipment Evaluation results, Pass, Fail, or
Marginal Evaluation Criteria
Relationship between Short Circuit results, Protective Device
Coordination and Arc Flash studies
Interpretation of PTW Arc Flash results and applying various
techniques to reduce arc flash hazard to below 40 cal/cm2
Arc Flash Labels, Work Permits, and legal issues |
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