206 DC Systems Analysis & Arc Flash 2-Day Training


Course Description:
This course has been redeveloped to include additional materials including photovoltaic systems and new DC Arc Flash methods based on Dan Doan's IEEE paper and NFPA 70E 2018.  This course is geared towards electrical power engineers responsible for the design and analysis of DC systems as well as managers responsible for reviewing and approving studies.  Join us and learn from the expert that developed the DC Arc Flash equations that is used in the SKM software!  Feel free to bring your own questions!

Discussions include an overview on commonly used DC equipment and the application of the Power*Tools program to analyze example DC electrical distribution systems. Battery sizing, load-flow, short-circuit, protection, and DC arc flash studies will be reviewed and then performed using the software. 


  • Review of DC equipment (Batteries, PV, Rectifiers, Inverters, and Loads)
  • DC Short Circuit calculations
  • DC Protection overview
  • Review of DC Arc Flash methods (Method to use based on application & limitations)
  • Provide practical DC system examples from typical industrial and commercial power systems with explanations of why the study results are presented.
  • Discuss issues, examine study results and potential problem areas.
  • Discuss considerations when selecting equipment, along with explaining equipment datasheets.
  • Provide relevant information needed to successfully complete a DC Systems study.

This course will be instructed by experts Daniel Doan and Ruperto Sanchez with a combined 55 years of power systems experience.
Students will earn 1.6 CEUs for this course.

Daniel R. Doan was the Principal Consultant for DuPont in Wilmington, Delaware for 35 years.  Dan received his BSEE and MSEE degrees from the Massachusetts Institute of Technology (MIT).  He has co-authored IEEE papers at IAS/PCIC and Pulp&Paper on subjects ranging from electrical safety to electrical system reliability and operations.  He has co-authored PCIC Tutorials on Electrical System Reliability and Arc Flash Hazard Analysis, and has participated in many IAS Electrical Safety Workshops as author and presenter.  Dan is an IEEE Fellow, Secretary of the IEEE IAS Electrical Safety Committee, a member of the IEEE 1584 ‘Guide for Performing Arc-Flash Hazard Calculations’ Working Group, and is a registered Professional Engineer in Pennsylvania.


Ruperto G. Sanchez is a Senior Engineer for SKM Systems Analysis, Inc. where he provides technical support for all the SKM Power*Tools products.  He has instructed thousands of engineers on the SKM Power*Tools software worldwide and assists Project Engineers with short circuit, load flow, motor starting, arc flash hazard analysis and other power system studies.  Ruperto received his BSEE with emphasis in Power Systems from California State Polytechnic University, Pomona.  Ruperto has 20 years of experience in the application of engineering computer software and is a member of the IEEE.                                                                                                                                                                                                                                            


Typical Stationary Battery Supplied Power System Example

  • Review of distribution system analysis topics including battery sizing, battery charger sizing, time dependent load flow, and short-circuit analysis.
  • Discussion of component characteristics and sources of data
  • Discussion of compliance with various standards
  • Discussion of considerations when selecting battery type

Typical Generator and Rectifier Supplied Power System Example

  • Discussion of equipment characteristics and sources of data
  • Review of distribution system analysis topics including load flow and short-circuit analysis
  • Examination and interpretation of PTW study results

Generator and Rectifier Supplied DC Distribution System

  • Examples of equipment data
  • Options for load flow and short circuit studies
  • Considerations applicable to large DC motors and generators
  • Interpretation of PTW equipment evaluation results

Analysis of Example Battery Supplied Distribution System

  • Examples of equipment data
  • Alternatives in battery sizing and load flow analysis
  • ANSI and IEC methods for short circuit analysis
  • Interpretation of PTW equipment results

Typical Lead-Acid and Nickel-Cadmium Battery Characteristic Example

  • Review and interpretation of manufacturer’s battery characteristic data
  • Entry of characteristic data into PTW Library

DC Arc Flash Example

  • Arc Flash calculations using NFPA 70E 2018 Annex D.5
  • Arc Flash calculations using Stokes - Oppenlander Method
  • Interpretation of PTW study results

Photovoltaic systems

  • Modeling of PV Arrays
  • Review of PV library (P-V and I-V curves)
  • Implementation of PV systems and interpretation of PTW study results

Other Topics

  • Discussion of methods and procedures on completing a typical study
  • Examination and interpretation of PTW study results and potential problem areas in a DC power system


  • Basic computer skills
  • SKM Power*Tools Standard 3-Day and Advanced 2-Day Training OR working knowledge of SKM PTW Software
  • Students are urged to review:
    • IEEE Brown Book Std 399 - 1997, chapter 16
    • IEEE 485 - 2010, “IEEE Recommended Practice for Sizing Lead-Acid Batteries for Stationary Applications”
    • IEEE 946 - 2004, “IEEE Recommended Practice for the Design of Safety-Related DC Auxiliary Power Systems for Nuclear Power Generating Stations”
    • IEEE 1115 - 2000, “IEEE Recommended Practice for Sizing Nickel-Cadmium Batteries for Stationary Applications”
    • IEEE 1184 - 2006, “IEEE Guide for Batteries for Uninterruptible Power Supply Systems”
    • IEEE 1375 - 1998, “Guide for the Protection of Stationary Battery Systems”
    • IEC Std 61660 Part 1, “Short Circuit Currents in D.C. Auxiliary Installations In Power Plants and Substations, Part 1: Calculation of Short-Circuit Currents”
    • IEEE 1584 2002/2004a, "Guide for Performing Arc Flash Hazard Calculations"
    • NFPA 70E, "Standard for Electrical Safety in the Workplace"
Course 206 DC Systems Analysis & Arc Flash 2-Day Training
Course Hours 7:30 AM to 4:30 PM
Course Fees Click Enroll button below to see latest fees. Does not include hotel or travel costs.
Registration Fees Include 1 Training Manual, Continental breakfast each day from 7 to 7:30 AM, On-site lunches and refreshments during breaks.
Training Equipment Students are responsible for bringing their own laptop computers. SKM will provide the latest version of the PTW software prior to the class for installation. License key will be provided on the first day of the course.
Course Location