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Objectives
  Review of distribution system analysis topics, including short- circuit, equipment evaluation, protective device coordination, and arc flash hazard analysis
Review of fundamental considerations for
protection, including data
gathering, fault calculations, equipment
damage and safety
Analysis of a sample electrical distribution system using the PTW software
Discussion of short-circuit, equipment evaluation, overcurrent coordination, and arc flash hazard analysis results
Present methods used to reduce the arc flash hazard
Discuss compliance with various codes and standards including ANSI, NEMA, NEC® and CEC
Presentation of several class examples that will help students gain a basic understanding of how to select and apply conductors, fuses, low and medium voltage circuit breakers, overcurrent relays and current transformers
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, potential problem areas and implementation of study recommendations
Prerequisites Basic computer skills
SKM Power*Tools Standard 3-Day and Advanced 2-Day
Training OR working knowledge of SKM PTW Software
This class is not recommended for beginners.
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 3.0 CEUs for this 3.5-day course.
Target AudienceThis course is intended for electric power engineers responsible for the design, analysis, and maintenance of three-phase industrial or institutional power 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, protection of apparatus, protective device
coordination, equipment evaluation, and arc flash hazard analysis
Discussion of compliance with various standards and
requirements
Data gathering and 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 and coordination study results
Discussion of methods and procedures on completing
a typical study
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
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Hands-On Lab - Analysis of a Sample Electrical
Distribution System in PTW
Distribution System in PTW
Interpretation of Equipment datasheets
Data gathering, data input and system modeling
Fault Calculations - Per unit method, Comprehensive Fault and ANSI method, types of faults, Interrupting Rating, Close-Latch Rating, and Test X/R
Developing time-current curves for phase and ground overcurrent
current coordination using PTW
Relationship between Short Circuit results, Protective Device
Coordination, and Arc Flash studies
Verifying protection of electrical apparatus and compliance with
related codes and standards
Interpretation of PTW Equipment Evaluation results, Pass, Fail, or Marginal Evaluation Criteria
Discussion of study results and methods to improve system
protection and coordination
Interpretation of PTW Arc Flash results and applying various techniques to reduce arc flash hazard to below 40 cal/cm2
Discussion of issues related to Selective Coordination
Discussion of Protection and Coordination issues for
Arc Flash studies
Arc Flash Labels, Work Permits, and legal issues
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