Overvoltage Protection Basics

Overvoltage Protection Basics

January 23-24, 2024 | Online :: Central Time

This course focuses on transmission to distribution substations and electric distribution circuits (15kV, 25kV and 35kV) arrester applications.

Every year the power delivery industry suffers millions of dollars in losses caused by overvoltage events. Equipment and system related failures are isolated by circuit breakers, fuses or reclosers and create a permanent outage to large areas serving many electric utility customers. This adversely affects the electrical utility’s reliability indices.

This course begins with a discussion of Ohm’s Law components (voltage, current & impedance) regarding surge currents and traveling wave theory then moves to insulating systems. A presentation outlining dielectric clearances and insulating materials provides a basis of understanding as to withstand capability within the electric system. The agenda moves on to an overview of surge arrester classification which includes those used at distribution and substation locations. Attendees will work through application examples that emphasize the various selection criteria. Overvoltage mitigation strategies, including shielding and arrester placement will be explored.

Learning Outcomes

  • Define Ohm’s Law components and their relationship to overvoltage issues
  • Classify, explain & discuss various types of overvoltage events
    • Sustained
    • Temporary
    • Transient
  • Analyze the propagation of transient surge currents and the resulting voltage
  • Interpret surge arrester catalog information
  • Contrast and evaluate overvoltage mitigation techniques
  • Calculate protective margins of arrester discharge voltage to equipment withstand voltage capability
  • Formulate a nominal protective solution based on effectiveness and economics


Tuesday, January 23, 2024 : Central Time

8:45 – 9:00 a.m.
Log In and Welcome

12:30 – 1:15 p.m.
Lunch Break

9:00 a.m. – 5:00 p.m.
Course Timing

Electricity Basics

  • Ohm’s Law
    • Voltage
    • Current
    • Resistance/Impedance

Electrical Equipment Insulation Systems

  • Extermal Clearances
    • Phase to Grid
    • Between Phases
    • Source to Load
  • Internal Insulating Material
    • Air
    • Oil
    • Paper impregnated with dielectric fluid
    • Polymer – silicon rubber, epoxy

Equipment Voltage Withstand Rating

  • 50/60Hz Wet/ Dry
  • Basic Insulation Level (BIL)
  • Vacuum Interrupters

Overvoltage Categories

  • Sustained Voltage Control
    • ANSI C84.1 – operating voltage range
      • Voltage Regulation
  • Temporary Overvoltage
  • Transient Overvoltage < Course Focus
    • Transient Overvoltage
      • Switching Surges
      • Lightning < Focus
        • Lightning

12:30 – 1:15 p.m. :: Lunch Break

Temporary Overvoltage Characteristics

  • Gapped vs. MOV

Surge Arrester Application

  • Distribution Class Arresters
  • Placement on the Distribution Systems
    • Overhead Distribution Systems
      • Equipment
      • Continuous Lines
      • End of radial line
      • Failed Arrester Isolator
    • Underground Distribution System
      • Riser/Dip Pole
      • End of Radial Line
      • Open point of Underground Loop
      • MOVE Arrester
        • Failed Arrester Disconnect System

Wednesday, January 24, 2024 : Central Time

8:45 – 9:00 a.m.
Log In

9:00 a.m. – 12:00 p.m.
Course Timing

Substation Surge Protection

  • Dielectric clearances per NESC Part 1
  • Lightening Sheild Wire
  • Lightening Mast
  • Transmission Line Discharge Energy
  • Station Class Arresters
    • Porcelain vs. polymer housed
    • Energy handling capability
  • Surge Arrester Cantilever Strength


Insulation Coordination

  • Formula
  • Acceptable margin
  • Example Problem

Substation OVP Design Strategy

  • Ground Grid Design
  • Placement of Arresters
  • Arrester Monitoring System


Jerry Josken, Senior Consultant and Instructor, EUCI 

Jerry holds a BS in Electrical Engineering Technology from the Milwaukee School of Engineering and an MBA from North Central College. During his 30+ year career with Eaton’s Cooper Power Systems, Jerry served in a variety of engineering capacities. Past leadership positions include Chair of IEEE Rural Electric Power Conference (2012) and GLEMS Distribution Equipment/Controls (2013-2014). Currently, Jerry develops and conducts professional development programs on various power delivery topics for EUCI.

Donald Wareham, Field Application Engineer, Eaton Corporation

Don is a graduate of Penn State University with a degree in Electrical Engineering, and obtained his MBA from the University of Pittsburgh. Don started his career with Westinghouse as a large power transformer design engineer. Don has been with Eaton/Cooper for the past 32 years and has had assignments as a power transformer design engineer, marketing engineer for the large power transformer business, application engineer for the recloser product line and for the last 25 years, has been a field application engineer. As a field application engineer, Don’s role is supporting customers in the Mid-Atlantic states on Eaton Cooper Power Series products such as reclosers, regulators, capacitors, arresters, fuses through both training classes and application support.

Online Delivery

We will be using Microsoft Teams to facilitate your participation in the upcoming event. You do not need to have an existing Teams account in order to participate in the broadcast – the course will play in your browser and you will have the option of using a microphone to speak with the room and ask questions, or type any questions in via the chat window and our on-site representative will relay your question to the instructor.

  • Microsoft recommends downloading and installing the Teams app if possible. You may also use the Edge browser or Chrome.
  • You will receive a separate email with a unique link to a personalized landing page which will include links to join all sessions of this event.
  • If you are using a microphone, please ensure that it is muted until such time as you need to ask a question.
  • The remote meeting connection will be open approximately 30 minutes before the start of the course. We encourage you to connect as early as possible in case you experience any unforeseen problems.


Please Note: This event is being conducted entirely online. All attendees will connect and attend from their computer, one connection per purchase. For details please see our FAQ

If you are unable to attend at the scheduled date and time, we make recordings available to all attendees for 7 days after the event


Overvoltage Protection Basics

January 23-24, 2024 | Online
Individual attendee(s) - $ 1195.00 each

Volume pricing also available

Individual attendee tickets can be mixed with ticket packs for complete flexibility

Pack of 5 attendees - $ 4,780.00 (20% discount)
Pack of 10 attendees - $ 8,365.00 (30% discount)
Pack of 20 attendees - $ 14,340.00 (40% discount)

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 December 22, 2023 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




EUCI is accredited by the International Accreditors for Continuing Education and Training (IACET) and offers IACET CEUs for its learning events that comply with the ANSI/IACET Continuing Education and Training Standard. IACET is recognized internationally as a standard development organization and accrediting body that promotes quality of continuing education and training.

EUCI is authorized by IACET to offer 1.1 CEUs for this event

Upon successful completion of this event, program participants interested in receiving CPE credits will receive a certificate of completion.

Course CPE Credits: 12.5
There is no prerequisite for this Course.
Program field of study: Specialized Knowledge
Program Level: Basic
Delivery Method: Group Internet Based
Advanced Preparation: None

CpeEUCI is registered with the National Association of State Boards of Accountancy (NASBA) as a sponsor of continuing professional education on the National Registry of CPE Sponsors. State boards of accountancy have final authority on the acceptance of individual courses for CPE credit. Complaints regarding registered sponsors may be submitted to the National Registry of CPE Sponsors through its web site: www.nasbaregistry.org


Who Should Attend  

Everyone responsible for the reliability and longevity of electric substation and distribution equipment and systems

Engineers, Technicians and those within Leadership Positions:

  • Reliability Analysis
  • Engineering Standards
  • Equipment/Device Approval
  • Substation and Distribution Designers
  • Consulting Engineering Firms