By - Jon Brown

Distribution Overcurrent Protection – Fuses and Reclosers
August 27, 2020 | Denver, CO

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If this event is of interest you may also be interested in this related event

Distribution Transformer Fundamentals, August 25-26, 2020 in Denver, CO

This course has been developed at the request of electric utilities and engineering consulting firms for their staff to gain practical experience with overcurrent protection on a typical distribution system.  The instructor was specifically selected for his skills at presenting complex distribution utility topics in a way that people can understand, remember and apply.  The 80/20 rule, rules of thumb, best practices, lessons learned, and traps to watch out for are just a few of the themes in this class.  He has been teaching over-current protection to engineers, trouble crews and linemen since 1998.  Over the years, veteran personnel from major fuse manufacturers have attended his training to get an end-user’s real-world perspective to fusing.

Learning Outcomes

  • Utilize overcurrent protective proper practices on a typical distribution system
  • Differentiate device types, ratings, applications and limitations
  • Define fuse characteristics and behaviors
  • Identify transformer fusing methodologies, device and size selection
  • Implement strategies for improving reliability on a distribution feeder
  • Examine the interaction of fuses and transformer mounted lightning arresters
  • Identify fusing options for URD transformers
  • Discuss recloser options, features and application strategies
  • Review operational considerations
  • Explain the how and why of coordination between devices
  • Utilize license free coordination software
  • Prepare solutions for when you don’t appear to have proper coordination between devices
  • Identify common failure modes of over-current devices



EUCI has been accredited as an Authorized Provider by the International Association for Continuing Education and Training (IACET).  In obtaining this accreditation, EUCI has demonstrated that it  complies with the ANSI/IACET Standard which is recognized internationally as a standard of good practice. As a result of their Authorized Provider status, EUCI is authorized to offer IACET CEUs for its programs that qualify under the ANSI/IACET Standard.

EUCI is authorized by IACET to offer 0.8 CEUs for this event.


Requirements for Successful Completion of Program

Participants must sign in/out each day, be in attendance for the entirety of the course

Instructional Methods

Power Point presentations, open discussion, examples and explanation of fuses materials


Thursday, August 27, 2020

8:00 – 8:30 a.m. :: Registration and Continental Breakfast

8:30 a.m. – 5:00 p.m. :: Course Timing

12:00 – 1:00 p.m. :: Group Luncheon

  • Fault Current Theory
  • Protection Practices
  • Fuse Operation
  • Cutouts and Fuse Holders
    • Types
    • Ratings
    • Features
  • Time Current Characteristics
    • Types
    • Speeds
    • Considerations
  • Reclosers
    • Transient faults
    • Recloser types and ratings
    • Applications
  • URD Transformer Fusing (Bayonet fuses)
    • Applications
    • Types / speeds
    • Operation
  • Current Limiting Fuses
  • Coordination
    • Fuse to fuse
    • Fuse to recloser
    • Bayonet and weak link fuses
    • Margin of protection
  • Transformer Fusing Methodology
    • Magnetizing inrush
    • Cold-load pick-up
    • Damage curves
  • Fusing and Arresters
    • Proper fusing for tank mounted arresters
  • Coordination
    • Software tools
    • Tables
  • Power Fuses
    • Types and ratings
    • Applications
  • Specialty Products
    • Sectionalizers
    • Trip savers
    • Fault fiters
  • Designer Expectations
    • Examples
    • Traps to watch out for
  • Operations related topics
    • Fuse tube inspection
    • Loadbuster tool
    • Open fuse storage


Thomas Callsen, PE, Weldy Lamont

Thomas Callsen has over 30-years of related utility experience.   

During his 25-years at Commonwealth Edison Company (ComEd), Thomas held numerous engineering roles culminating as a Principal Engineer/Consulting Engineer in the Distribution Standards department where he was responsible for distribution transformers, capacitors, fuses, reclosers and distribution automation hardware.  In 2006 Thomas received DistribuTECH’s prestigious “Project of the Year Award” for his “Distribution Center in a Box” substation.  In 2009 he received the award again for industry’s first real-time overhead fault indicator communicating over a mesh network radio system.  (Both products are now commercially available.)  He received a US patent for the invention of the DC in a Box transformer design. 

In 2010, Thomas joined Weldy Lamont Associates where he is the Project Manager for a rural electrification project in West Africa.  This project includes construction of over 4,000 miles of overhead distribution lines serving over 2,000 rural communities in Ghana.  This project received the 2012 African Energy Award for the “Rural Electrification Project of the Year”.  Thomas has expanded his training to the electric utilities in Ghana where he has incorporated several of the industry’s best practices into the country’s overhead distribution line designs.

Thomas is a Senior Member of the IEEE and an active member of the IEEE Transformer Committee that writes the industry standards for transformers in North America.  Thomas holds a BSEE from the University of Wisconsin – Milwaukee and is a licensed Professional Engineer.


EUCI Conference Center

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Greenwood Village CO, 80111

The EUCI conference center is conveniently located adjacent to the Arapahoe at Village Center Light Rail Station, allowing easy access to and from DIA, Downtown, and Local Area Attractions.

Nearby Hotels

Each of these hotels offers a complimentary shuttle to and from the EUCI conference center.

Hyatt Regency Denver Tech Center
7800 East Tufts Ave
Denver, CO 80237
Phone: 1-303-779-1234
2.8 miles away
Special EUCI Room Rate: $179.00
To access EUCI room rate visit
Click “Book Now”, then click “Special Rates”
Click “Corporate or Group Code” and enter CR102338
You may also call our central reservation at 1-800-233-1234 and give them the corporate code of CR102338

Double Tree by Hilton DTC
7801 East Orchard Rd.
Greenwood Village, CO 80111
Phone: 303-779-6161
0.5 miles away

Wingate by Wyndham
8000 East Peakview Ave
Greenwood Village, CO 80111
Phone: 303-626-2641
0.3 miles away

Hyatt Place Denver Tech Center
8300 E.Crescent Parkway
Greenwood Village, CO 80111
Phone: 1-303-804-0700
2.1 miles away

Denver Marriott Tech Center
4900 S Syracuse St
Denver, CO 80237
Phone: 303-779-1100
3.1 miles away


EventEarly Bird Before
Friday, August 07, 2020
Standard RateAttendees
Distribution Over-Current Protection - Fuses and ReclosersUS $ 895.00 US $ 995.00

This event has the following related events:

Distribution Transformer FundamentalsUS $ 1295.00 US $ 1495.00

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Take advantage of these discounts!

  • Attend the Course and Distribution Transformer Fundamentals and pay US $ 2,095.00 per attendee (save US $ 95.00 each)

Cancellation Policy

Your registration may be transferred to a member of your organization up to 24 hours in advance of the event. Cancellations must be received on or before July 24, 2020 in order to be refunded and will be subject to a US $195.00 processing fee per registrant. No refunds will be made after this date. Cancellations received after this date will create a credit of the tuition (less processing fee) good toward any other EUCI event. This credit will be good for six months from the cancellation date. In the event of non-attendance, all registration fees will be forfeited. In case of conference cancellation, EUCIs liability is limited to refund of the event registration fee only. For more information regarding administrative policies, such as complaints and refunds, please contact our offices at 303-770-8800

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