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What's an Arrester? pdf What's an Arrester? pdf

Our Focus
AresterWorks Team
ArresterWorks is an International Consulting Firm focused on assisting others in improving power system reliability through design, production and application of arresters to mitigate the effect of lightning and other transients.

See how ArresterWorks can help you if you are a Manufacturer, Educator, or User of Arresters

Topics of Interest

Greetings Everyone from ArresterWorks hope you all have a great 2023......

Our first project this year is with the NEMA Surge Arrester Section. We are updating a video we produced in 2016 on Understanding Arrester Datasheets. Believe it or not, in this very mature product, there are some new improvements in the published datasheets. For those that can remember when datasheets were hard copy only, it is most convenent to be able to immediately access them on the internet these days.

Currently we are working on the explanation of the Discharge Voltage Datasheet which now typically has TOV data along with Protective Data. Results will be availalbe first quarter 2023 at There are many other educational papers and videos at the Nema site.

Line Surge Arrester Benefit Calculator
The project we did last year with the Arrester Section of NEMA was to update the Line Surge Arrester Calculator which can be very useful to those that would like to get an idea of how a transmission line lightning performance would improve with the use of arresters.

Underbuilt Arrester

Underbuilt Arrester

When two overhead circuits of different voltages exist on the same poles, the possibility exists that contact between the two circuits will occur. If this happens it can result in damage to equipment on the lower voltage circuit. The underbuilt line arrester is a simple method of protecting the lower circuit from a sustained overvoltage event. For more information on this reference ArresterFact 022 in the Knowledge Center.

Grading Rings not Corona Rings

Grading Rings

Grading rings are often mistaken for corona rings. They indeed look similar and they both are designed to affect the electric field in the near vicinity. However, unlike corona rings, reducing partial discharge is not a function of grading rings. The purpose of grading rings on arresters is to significantly modify the voltage distribution along the vertical axis of the arrester. This voltage distribution allows the arrester to operate without an increase in its temperature near the top of the arrester. The lower temperature level allows the arrester to absorb more energy during a switching surge event. The grading ring in effect increases the energy handling capability of the arrester.

Old SiC Arresters used as Pedestals

Old SiC Arresters used as Pedestals.jpg

One of the challenges encountered when upgrading surge protection from the last generation of Silicon Carbide Gapped (SiC) arresters to polymer housed MOV arresters is the difference in height. Polymer housed MOV arresters are sometimes ½ the height of the equivalent rated SiC arrester. In the photo above the installers chose to use the bottom two sections of the old SiC arrester as the pedestal for the shorter polymer housed arrester. The bottom brown section is circa 1950s and the polymer housed arrester is circa 2010. Notice the cable shorting the remaining brown porcelain sections of the SiC arrester to ground.

Applying Arresters to Create a Shielded System

Applying Arresters to Create a Shielded System

An underutilized application of distribution arresters is the use on vertical configurations to double duty the top phase as a shield. This application requires an arrester on every pole with a good down ground. The down ground is insulated from the pole at the base of the other phase insulators to reduce the risk of backflash. This application is discussed in detail in IEEE 1410. An arrester on the top phase of each pole can reduce the outage rate by 85% if a good ground is achieved. A standard distribution arrester is used in this case.

2020 Webinar Presentations Continues in August/September
with second offering of Arresters 101 & 201 and
Insulation Coordination Fundamentals

Seminar Seminar Seminar

Arresters 101 covers the fundamentals of surge protection on Transmission and Distribution Power Systems. In 4 hrs, you will learn everything you need to know to participate constructively in any discussion on surge protection of power systems. We will take vague concepts to practical applications.
August 13 & 14, 2020

Arresters 201 this new webinar by ArresterWorks is the next level to our popular Arresters 101. In this webinar the participant will learn details on how to protect under built circuits, how to optimally protect high asset value generators, how to determine if our underground system is properly protected, and much more.
August 20 & 21, 2020

Insulation Coordination Fundamentals covers the fundamentals of insulation coordination as well as instruction on how to run transient simulations. The seminar will be presented over a five-week period in two hour sessions. This schedule is intended to allow time in between sessions to complete the provided exercises that will test the individuals understanding of the covered information.
August 28 & September 3,11,18, 25

Link to Registration Page
Link to course brochure and outline
Link to Registration Page
Link to course brochure and outline
Link to Registration Page
Link to course brochure and outline

Announcing Start of 2020 Webinar Presentations
First Sessions will be in March/April 2020

Seminar Seminar Seminar

Arresters 101 covers the fundamentals of surge protection on Transmission and Distribution Power Systems. In 4 hrs, you will learn everything you need to know to participate constructively in any discussion on surge protection of power systems. We will take vague concepts to practical applications.

Arresters 201 this new webinar by ArresterWorks is the next level to our popular Arresters 101. In this webinar the participant will learn details on how to protect under built circuits, how to optimally protect high asset value generators, how to determine if our underground system is properly protected, and much more.

Insulation Coordination Fundamentals covers the fundamentals of insulation coordination as well as instruction on how to run transient simulations. The seminar will be presented over a five-week period in two hour sessions. This schedule is intended to allow time in between sessions to complete the provided exercises that will test the individuals understanding of the covered information.

Link to Registration Page
Link to course brochure and outline
Link to Registration Page
Link to course brochure and outline
Link to Registration Page
Link to course brochure and outline

T&D Surge Protection Seminar Presented in Melbourne, Australia

T&D Surge Protection Seminar, Melbourne, Australia

On a recent trip to Southeastern Australia, ArresterWorks was pleased to present a T&D surge protection seminar at the University of Melbourne, Old Arts Building, Parkville VIC 3052, Australia. The seminar was sponsored by the IEEE Power Engineer Society, Victoria Section, with attendees from several area utilities and consultancies.

Surge protection of power systems in Australia requires extra precautions when it comes to the use of arresters due to the increased risks of brush and forest fires. For this reason, ArresterWorks was interested in observing how arresters were utilized in the cities versus the country as well as the different types of arresters used and how they were applied. It was a very informative trip and ArresterWorks is grateful to everyone who helped in this learning experience.

Announcing March
T&D Surge Protection Webinar

T&D Surge Protection Webinar

This webinar covers the fundamentals of surge protection on Transmission and Distribution Power Systems. In 4 hrs, you will learn everything you need to know to participate constructively in any discussion on surge protection of power systems. We will take vague concepts to practical applications.

Start Time:
Session Duration:
Meeting Software:
March 5th and 6th, 2019
10:00 AM New York time
Two - 2 hour sessions

Click here for details

IEC - 1906 Award
Recognizes exceptional current achievements of experts


John Thompson (L)
IEC USNC President

Jonathan Woodworth (C)
ArresterWorks Principal Engineer

Frans Vreeswijk (R)
IEC General Secretary and CEO

On September 13th of this year, ArresterWorks' Jonathan Woodworth received IEC's 1906 Award at a ceremony in Arlington, Va. Jonathan received the award for his role in TC37 working group MT4 leading the development of IEC standard 60099-4 Test Rationale and spearheading the use of monthly virtual meetings.

Created in 2004 by the IEC Executive Committee (ExCo), the 1906 Award commemorates the IEC's year of foundation and honors IEC experts around the world whose work is fundamental to the IEC.

Onsite Training Offered By ArresterWorks

Sometime, the most economical way to train a number of your people is to bring the trainer to your facility. Recognizing this, ArresterWorks has created training sessions that are intended to be presented to a live class room. Each of these sessions can be tailored to meet the specific needs of the customer, covering only the material that is pertinent to the customer’s needs.

Seminar offerings:

Substation overvoltage protection seminar
Transmission line overvoltage protection seminar
Distribution system overvoltage protection seminar
Custom seminar base on customer requirements

Click here for details

Announcing April - May 2018
Insulation Coordination Fundamentals Webinar

Insulation Coordination Fundamentals Webinar

This online seminar, being offered by ArresterWorks, is designed for students who are familiar with transient software and are looking to expand their knowledge on the concepts of modeling arresters and the necessary principles of an insulation coordination study for surge protection. ATP and ATPDraw will be used for the course discussions, however participants may use the software they have available and are familiar with.

Start Time:
Session Duration:
Meeting Software:
April & May 2018
9:00 AM New York time
Five - 2 hour sessions

Click here for details

ArresterFacts Mini on the Marx Generator
A long history in arrester testing

The Marx Generator

Without question, the heart of surge arrester testing is the Marx generator. This high impulse current or high impulse voltage generator is used to simulate lightning for all the major impulse tests required by standards. Designed by Erwin Marx in Hermsdorf Germany in 1924, it has changed very little in 94 years. The Marx generator is able to produce such high currents and voltages by charging relatively low voltage capacitors in parallel and then discharging them in series. Today, all these years later, every high impulse voltage and current laboratory owns and operates one or two of these generators.
The generator shown in the photo above is an example of a high current Marx generator and is from the Central Power Research Institute (CPRI) of India which has recently upgraded their generator to obtain higher currents as well as their data acquisition system.

Announcing ArresterWorks' Online
Insulation Coordination Seminar
October 2017

Insulation Coordination Webinar

This seminar covers the fundamentals of insulation coordination as well as instruction on how to run transient simulations. The seminar will be presented over a five-week period in two hour sessions. This schedule is intended to allow time in between sessions to complete the provided exercises that will test the individuals understanding of the covered information.

Who Should Attend:
Anyone who wishes
to learn the
fundamentals of
Insulation Coordination

Fee:    $699
PDH Credits: 10 credit hrs
Recommended Prerequisites
• Attendees should have working ATP, ATPDraw and XY-Plot packages installed on their computers. Or your own transient software package to run simulations on.
• Fast Internet line that can handle video conferencing.
• 2-3hour time slots once a week for 5 weeks.
• Time to do homework between sessions.

Link to Registration Page
Link to course brochure and outline

EGLAs in West Texas


We have long felt that the externally gapped arrester is the most beneficial arrester to use on overhead transmission lines. In fact, we have published a number of papers supporting this idea. We were very pleased when we recently received these photos of ELGAs that have been installed on two lines just west of Andrews, Texas. We are interested in learning who designed or owns this installation, as well as who is the manufacturer of this arrester. If anyone has any information, please send us an email or give us a call (+1.716.307.2431).

ArresterWorks - Arrester Thermal Profile Project

ArresterWorks is conducting a study on the correlation between arrester leakage current and its surface temperature. This is part of the work that will be presented at the 2017 INMR World Congress. We are using a wireless sensor (patent pending) attached to the outside of the 152kV MCOV polymer housed arrester for the data collection. One of the first things you learn about the surface temperature of an arrester is that it is always in flux. The many variables that affect its temperature will make this parameter very hard to model. In any case, here is a preview of the temperature of an arrester over a 5-day period. The arrester is not energized and all the variations come from the environment. More interesting results to come…...

Sensor temperature chart

IEEE General Meeting

IEEE General Meeting

At the request of IEEE, ArresterWorks presented a one day Surge Protection Seminar at the 2017 IEEE general meeting in Chicago, Illinois.

Surge Protection Lecture at Florida State University

Grounding & Lightning Conference

On Tuesday, March 28, 2017 ArresterWorks was honored to presented to 65 plus graduate students of the FSU electrical engineering department. Jonathan Woodworth lectured on the effects of lightning surges on power systems and methods of mitigating the damage to power equipment with arresters.
Jonathan was invited to speak at FSU by Dr. Thomas Bellarmine, Ph.D., P.E. as part of the IEEE Power and Energy Distinguished Lecturer Program.

CEATI Grounding and Lightning Fall Conference

Grounding & Lightning Conference

“Grounding and lightning issues continue to be an important area of development for the industry. New and better ways to design, construct and test grounding and lightning systems are progressing in order to meet higher standards and changing industry demands. This conference is an open forum for information exchange, technical presentations, and training. It will focus on seven overarching themes that will discuss ideas and experiences for the benefit of the participants and industry as a whole.”

Click here for details

ArreseterFacts 017 Companion Video
Understanding BackFlash

ArresterFacts Library

Overview of IEC 60099-4
Energy Handling Tests - ArresterFacts 033 R3

Overview of IEC 60099-4

ArresterFact 033 r3 is an update to the original and now covers the changes as they were released in the 2014 Edition 3.0 of IEC 60099-4. There were many improvements in this edition over edition 2.0 from 2009. The most significant change however was the introduction of a new energy rating system. The Long Duration (LD) discharge classes 1-5 are now history and the new Qrs and Wth tests are used for the energy rating of Station and Distribution Arresters. This is the third edition of this ArresterFacts and is now up to date with what is published in the standard. .

ArresterFacts Library

MOV Arrester AC Conduction Simulation Tool Demo
ArresterFacts 027 Arrester Reference Voltage

ArresterFacts Library

Re-release as Video
ArresterFacts 009 What is a Lightning Arrester

ArresterFacts Library

New Release
ArresterFacts 044 Gapped MOV Technology

ArresterFacts Library

June 2016

Surge Protection Seminar Scheduled for June 2016


ArresterWorks Presents
Surge Protection Seminar
June 23-24, 2016
Hosted by Siemens Energy

ArresterWorks' surge protection seminar is an in-depth course covering the different types of arresters, their design fundamentals and their applications to protect power systems. This course is designed to help all those who deal with surge protection and/or system reliability.

Who Should Attend:
• Anyone new to the industry who wishes to learn the fundamentals of surge and lightning protection
• Standards engineers responsible for maintaining system construction and equipment standards
• Reliability engineers and other reliability personnel responsible for continuous improvement
• Substation designers, distribution system designers, and transmission line designers
• Power system operations and maintenance supervisors
• Power engineering personnel who wish to broaden their scope of system understanding
• Experienced engineers that want to learn about the latest energy ratings of arresters

Course Brochure

When: Thursday June 23rd full day and Friday June 24th half day
Where: Siemens Energy Inc, 444 Highway 49 South, Richland, MS
Fee: 899 USD

Contact: for questions.

April 2016

Are you sure your substation is protected from what might be coming down the line.

Transmission Tower

The assets in a substation can be worth millions. The surge protection of these assets is critical to maintaining a healthy power delivery system. One way to ensure that all the necessary protection is in place is to have an insulation coordination study of your substation.

ArresterWorks routinely does studies for utilities, wind farms, PV farms, transformer manufactures and EPC firms. Visit our FAQ page on insulation coordination studies for more information .

Look for our ArresterFacts on this topic coming in May. In the mean time we invite you to call or email us with any additional questions you might have or if we can be of service.

October 2015

INMR 2015 World Congress


On October 18 – 21, over 600 attendees from 60 countries came to Munich Germany, for the 2015 INMR World Congress. This year’s congress marked 20 years of INMR bringing the world together for discussions on insulator, arresters, bushings, and cable accessories.


The arrester session, a relatively new addition to the congress, was co-chaired by Jonathan Woodworth of ArresterWorks and Professor Hinrichsen of TU Darmstadt. The session consisted of eighteen papers covering topics of importance to both the manufacturers and the users of surge protective devices. Talks included discussion on arrester monitoring devices, IEC standards, voltage distribution along an arrester, and arresters of the future.

Jonathan Woodworth presented a paper entitled "Arrester 2050". The subject matter was a call to the arrester world for a paradigm shift in surge protection. He emphasized that the introduction of polymer housed arrester in the 1980’s was the last major change in the arrester industry. Mr. Woodworth stated that he envisions arrester 2050 being lighter, greener, self-installing and much smaller than today. He continued by stating that with improved MOV characteristics, the arrester 2050 may not even resemble arresters as we know them. Although he made light of these futuristic changes, the underlying message was a serious one in that the arrester designers of the future will have to let go of the boundaries of today if they want to be the innovators of tomorrow.

Read Arrester 2050 paper.

August 2015

Standards Update

As of this past May, the IEC and IEEE High Voltage Surge Arrester Committees have initiated a Harmonization Task force. We will be meeting 2 times per year for the next few years with the goal of harmonizing C62.11 and IEC 60099-4. At the present time there are several sections that were written with harmonization in mind and it has worked quite well. There are about 5 or more sections in the design tests that can be unified and harmonized. Our first tasks are to identify these sections and start the process of making them as similar as possible if not identical. More info in early November on how it is going.

December 2014

New IEC Arrester Standard Published This Year

   60099-4 Ed. 3.0 - 2014: Surge arresters - Part 4:
   Metal-oxide surge arresters without gaps for a.c. systems

A new concept of arrester classification and energy withstand testing is introduced: the line discharge classification is replaced by a classification based on repetitive charge transfer rating Qrs, thermal energy rating Withzz and thermal charge transfer rating Qth, respectively. The new concept clearly differentiates between impulse and thermal energy handling capability, which is reflected in the test procedures and minimum pass criteria.

The Definitions of these ratings are as follows:

  • Thermal Energy Rating, Wth: The energy, given in kJ/kV of Ur, which may be dissipated by an arrester or arrester section in a thermal recovery test without causing a thermal runaway.

  • Repetitive Charge Transfer Rating, Qrs: The charge, given in coulombs (C) in the form of a single event that can be transferred at least 20 times ( at time intervals that allow for cooling to ambient temperature ) through an arrester without causing mechanical failure or unacceptable electrical degradation to the MO resistors.

  • Thermal Charge Transfer Rating, Qth: The charge, given in coulombs (C) that may be transferred through an arrester or arrester section in a thermal recovery test without causing a thermal runaway.

  • As shown in the table below, Station Class arresters will have a Qrs and Wth rating. Distribution arresters will have a Qrs and Qth rating.

    Surge Arrester Distribution Table

    The newest version of the publication can be purchased at the IEC Web Store.

    October 2014

    IEC MT4 and MT10 Fall Meeting attended
            by delegates from 7 Countries

    This year's fall IEC MT4 and MT10 meetings were held in Niagara Falls Canada. Eighteen maintenance team members travelled from around the world to attend the meetings.

    The focus of the meets were on the next editions of IEC 60099-4, 60099-5, 60099-6 and 60099-8. All standards will be published in the next 3 years. A Technical Report that will likely have the Designation 60099-10 is also in the works and will contain all the rationale of required tests. This will be a first for the IEC and should add significant value to our work.

    A special thanks to this years sponsors:
        Eaton's Cooper Power Systems
        Hubble Power Systems

    IEEE SPDC Fall Meeting held in Clearwater, Florida

    In 2012 the last edition of IEEE C62.11 was published. One of the main objective of the meetings in Clearwater was to work on the next edition. The new release will include new sections related to transmission line arresters as well as streamlined sections related to all other arresters. Target publication is 2018

    September 2014

    ArresterNews Features INMR 2015 World Congress Call for Papers and New ArresterFacts

    May 2013 ArresterNews Cover Thumb
    Articles Inside
    1. ArresterFacts 024 - Separation Distance
    2. INMR 2015 World Congress Call for Papers
    3. Photos of Interest: Interesting Configuration

    Online version of September ArresterNews

    June/July 2014

     Transmission line arresters on NB Power Line 68

    ArresterWorks visits Maritime Electric and NB Power

    During the months of June and July, ArresterWorks visited New Brunswick Power and Maritime Electric to present Overvoltage Protection seminars. In both seminars the participants brought real world surge protection issues to the table for discussion, enhancing the value of the seminar. We were pleased to receive the following comment from Shelly Feltmate, Senior Engineer – Transmission Lines, at New Brunswick Power: "The ArresterWorks – Overvoltage Protection Seminar was by far one of the most informative and interesting seminars I have attended to date. By keeping the seminar extremely interactive with the attendees, the material covered was easily tailored to our experiences and/or interests as a company."

    Also as part of this trip we surveyed the New Brunswick and Prince Edward Island Provinces documenting and photographing the different methods of lightning protection of the power systems.

    June 2014

    Transmission Line Arresters

    ArresterWorks to develop guide for the condition assessment of lightning arresters installed on transmission lines for CEATI International ( )

    Arresters have been protecting power lines in substation and on distribution lines for more than a century. Despite this long history, it has only been in the last 20 years that arresters have begun to be used on sub-transmission and transmission lines. This relatively new application of the arrester has left many users questioning how to verify the health of the arresters they have in service. At present, there are no comprehensive guides for the maintenance of arresters on transmission lines; however, this problem will soon be resolved.

    CEATI International has retained ArresterWorks to write a transmission line arrester guide that will cover both the electrical and the mechanical maintenance aspects. The primary objective of this project will be to produce a guide that clearly shows how to use existing arrester condition assessment tools on transmission line arresters. The guide will assist CEATI Transmission Line Asset Management group members in understanding the health and the expected remaining life of their arresters, with focus on assessment methods currently available for both Non-Gapped Line Arresters (NGLA) and Externally Gapped Line Arresters (EGLA).

    May 2014

    ArresterWorks First Patent

    ArresterWorks granted its first arrester patent.
    On April 29, 2014 ArresterWorks was granted US Patent No. 8,711,538 for an EGLA failure indicator. This device now makes the EGLA a more desirable arrester for line protection in that not only does it restore the original system BIL if the arrester should fail, but it also provides a visual indication that the arrester has failed.

    April 2014

    IEEE 2014 Conference

    The 2014 IEEE PES T&D Conference & Exposition brought hundreds of manufactures and users together in Chicago. On display were a number of arresters in various applications. Click here to view photos from the exposition.

    Besides the exposition there was a variety of technical papers presented. The Lightning Performance of Overhead Lines panel session was comprised of four informative presentations. Among them was a presentation by ArresterWorks', Jonathan Woodworth on Externally Gapped Line Arresters - A Critical Design Review

    March 2014

    Doble 2014 Conference

    ArresterWorks' Jonathan Woodworth presented an update on engineering/economic study on lowering losses of transmission lines with arresters at the Doble International Conference in Boston, Massachusetts.

    Power systems experience losses in many forms and a great deal of effort is put forth to reduce these losses in many areas. However the losses related to overhead ground wires (OHGW) of transmission lines arerarely mitigated on systems below 345kV. The losses relating to OHGWs are due to inductive currents from the phase conductors onto the OHGW or sometimes called shield wires. The study showed how arresters can be used in place of OHGWs on transmission lines to 100% eliminate induced losses and at the same time increase the reliability of the system.

    The study was funded in part by NYSERDA and was conducted in cooperation with ArresterWorks, Ceralink Inc, Rensselaer University and Cornell University.

    September 2013

    Vancouver Harbor View

    Vancouver's sunny days were the perfect backdrop for
    INMR's 2013 World Congress
    People involved in surge protection, from around the world, came to Vancouver to attended the congress.

    Jonathan Woodworth

    ArresterWorks' Jonathan Woodworth, session chair and co-organizer of the Congress Arrester Session, presented an engineering/economic study on lowering losses of transmission lines with arresters. The study, which is being funded in part by NYSERDA, is still in process and is being conducted in cooperation with ArresterWorks, Ceralink Inc, Rensselaer University and Cornell University.
    More information on the project will be available in the future as it advances.

    August 2013

    June/July 2013 ArresterNews Cover Thumb

    ArresterWorks holds sucessful
    Overvoltage Protection Seminar
    in cooperation with
    Duke Energy
    Charlotte, NC

    July 2013

    June/July ArresterNews   
    May 2013 ArresterNews Cover Thumb
    Articles Inside
    1. ArresterFacts 021 - Arrester Ground Lead Material
            Can Steel be Used
    2. August OVP Seminar - ArresterWorks
            Cosponsored by Duke Energy
    3. Photos of Interest - Find the Arrester

    May 2013

    May ArresterNews   
    May 2013 ArresterNews Cover Thumb
    Articles Inside
    1. ArresterFacts 006 - Arrester Forensics
    2. eSeminar - Arresters 101
    3. Photos of Interest - Extreme Contamination

    Online version of May ArresterNews

    April 2013

    Insulation Coordination FAQ   
    A quick overview of Insulation Coordination for Power Systems

    Insulation Coordination Thumb
    This is a quick overview of the complex subject of Insulation Coordination. It contains links to example studies and ArreterFacts 037 on the same subject.

    New FAQ Page on Line

    Down Load the FAQ

    April 2013 ArresterNews   
    April 2013 ArresterNews Cover Thumb
    Articles Inside
    1. Insulaiton Coordination FAQ
    2. A Unique Application of Power Conductors
    3. Survey: Do you experience pole damage from Lightning?

    Online version of April ArresterNews

    New Photos on Pole Damage Posted   
    April 2013 ArresterNews Cover Thumb
    Check out these examples of pole damage. If you have experienced such damage, let us know.
    Go to Photo Page

    March 2013

    ArresterFacts 042   
    Guide for Selecting an Arrester Field Test Method

    ArresterFacts 042 Thumb

    This ArresterFacts offers guidance when selecting the method to test surge arresters away from the lab environment
    ArresterFacts 042 - Guide for Selecting an Arrester Field Test Method

    Extreme Arresters
    A Collection of Arrester Photos at Extreme Locations

    Donald E Raudabaugh
    This first of the series Extrene Arrester Photos comes from West Quoddy Head, Maine, USA. Where the eastern most surge arrester in the Continental USA is located. Have a look.
    Extreme Arresters Photo Page

    New Forum Post
    To Add An Extra Ground or Not, That is the Question

    ArresterWorks has posed the question as to whether a parallel conductor is necessary for an arrester that is mounted on a transformer structure that is also grounded to the station grid.
    Take a look at the complete question and photo.

    Januray 2013

    ArresterFacts 032   
    The Sheath Voltage Limiter

    ArresterFacts 032 Thumb

    The ArresterFacts covers all aspects of Sheath voltage limiters including how to select the MCOV rating is now available.
    ArresterFacts 032 - The Sheath Voltage Limiter

    For those using ATPDraw to model Sheath Voltage Limters, there are two models that can be downloaded here.
    SVL and Cable Model for Lightning Analysis for ATPDraw  (.acp file zipped)
    SVL and Cable Model for Switching Analysis for ATPDraw  (.acp file zipped)

    Donald E Raudabaugh
    Inducted into Surge Protection Hall of Fame

    Donald E Raudabaugh
    Donald E Raudabaugh is credited with initiating the "Polymer Housed Arrester Era" of surge arresters. In 1984 he applied for the first patent that lead to the introduction of the polymer housed arrester in 1986 by the Ohio Brass Company.
    Complete Hall of Fame Citation
    Hall of Fame Page

    October 2012

    No Ordinary Call for Papers
    2013 INMR World Congress
    Thumb of INMR Congress In September of next year ArresterWorks will be at the 2013 INMR World Congress and there is no doubt it will be an exciting time. If you have been involved in an interesting surge protection issue that is being or has been resolved, the world wants to hear your story. This is an opportunity of a career, to tell other like minded people what you have done and how you succeeded. We are looking for papers and presenters. If you are interested, click here and let me know.

    ArresterFacts 040   
    New IEEE C62.11 Arrester Test Requirements

    ArresterFacts 040 Thumb

    In just a few weeks, the 2012 edition of IEEE C62.11 will be published. This new test standard is a dramatic improvement over the last edition in that it contains for the first time standardized energy handling tests.

    ArresterFacts 040 - The New IEEE C62.11 Test Requirements (An Overview)

    September 2012

    ArresterFacts 038   
    Calculating Value of a Distribution Arrester?

    ArresterFacts 038 Thumb

    This ArresterFacts presents a new method of calculating the value of an arrester. In this evaluation, the arrester value is equal to the cost of equipment that would have to be replaced if the arrester was not present. A calculator is also on the Calculator Page that allows for a check of arresters in your area of interest.

    ArresterFacts 038 - Calculating the Value of a Distribution Arrester

    ArresterWorks' First Online Calculator...
    Arrester Value Calculator
    This on-line calculator can be used to check the value of your arrester.... Give it a try

    On-line Distribution Arrester Value Calculator

    ArresterFacts 033 Updated
    An Overview of Proposed Energy Handling Tests in IEC 60099-4

    ArresterFacts_033_Cover Later this year a significant change in the way arresters are rated relative to energy handling will become a standard. This ArresterFacts provides an overview of what is coming. Anyone that specifies, tests, manufacturers, or uses arresters should put reading this on their to-do-list.

    Visit the ArresterFacts Library

    August 2012

    ArresterFacts 029   
    Distribution System Responses to Lightning

    ArresterFacts 029 Thumb

    Topics Covered
    1. Current and Voltage Distribution on a Line after a Strike
    2. Arrester Behavior on a Line
    3. Arrester Spacing Effects

    If you have ever wondered how often to apply arresters on a line to reduce outages, this Arresterfacts is for you.

    ArresterFacts 029 Distribution System Responses to Lightning Strikes

    July 2012

    ArresterFacts 028   "Understanding TOV Behavior of Arresters"
    Published in Australiain Transmission & Distribution eMag June-July 2012   
    Australian T&D eMag Cover

    How an arrester responds to power frequency temporary overvoltages (TOV), is seldom discussed in the literature and a phenomenon that is studied even less. This Arresterfacts is a short synopsis of the topic that should introduce the reader to some of the aspects of TOV with respect to arresters -Check it out-

    June 2012

    ArresterFacts 037   
    Insulation Coordination Fundamentals

    ArresterFacts 037 Thumb

    Topics Covered
    1. Basic Insulation Coordination Definitions
    2. Surge Characterstics
    3. Insulation Characteristics
    4. 2% Voltage Overview
    5. Distribution System Insulation Coordination

    Insulation Coordination Fundamentals - Where Arrester and Insulator Characteristics Meet -

    AutoGap Arrester by Hubbard added
    to ArresterWorks Virtual Museum

    Pellet Arrester This Hubbard AutoGap Arrester has been protecting its transformer for for perhaps 60 years. Hubbard an arrester manufacturer introduced this arrester in 1952 and proclaimed better protection because it had two vents for expulsion of the arc by-products.
    -Have a look-

    April 2012

    ArresterWorks Introduces

    eConsulting in Surge Protection

    A Rapid Response Engineering Service

    eConsulting Logo For the organization that needs expert help on a surge protection issue Right Now and you prefer not to initiate a long term high cost project. You just want to solve this issue and move on. Using everyday video and internet technologies, you can do it with eConsulting at ArresterWorks. Check out the eConsulting Service.

    ArresterFacts 036   
    Arrester Condition Monitors - A State of the Art Review

    ArresterFacts 036 Thumb Topics Covered
    1. Purpose of Arrester Condition Monitoring
    2. Surge Counters
    3. AC Leakage Current Meter
    4. Third Harmonic Current Measurement
    5. Partial Discharge Detection
    6. Thermal Imaging
    7. Off Line Arrester Field Testing

    Arrester Condition Monitoring - A State of the Art Review -

    eSeminar - Arresters 101 now available
    for Group Lunch and Learn Type Presentations (on line)   

    Cover Arresters 101 If you have a group that could use a better understanding of Arresters. Taka advantage of his free offer. ArresterWorks will do an eSeminar on Arresters based on your schedule. Conatact us for scheduling. Remember this qualifies for CEU credits.

    Click here for Brochure on Arresters 101

    February 2012

    ArresterWorks Introduces eSeminar Series

    Eseminar Logo ArresterWorks has made learning about surge protection of power system easier and more cost effective than ever. Our new eSeminar series allows participants to eliminate travel costs and wasted time, by just participating in an online dialog on many surge protection subjects. Check out the eSeminar Series.

    ArresterFacts 034   
    Conductor Size Considerations for Staton Class Arresters

    ArresterFacts 034 Thumb Topics Covered
    1. Diameter and Length Effects
    2. Fault Current Considerations
    3. Corona Considerations
    4. Effect on Voltage Refelections
    5. Mechanical Considerations
    6. Ground Conductor Considerations
    Conductor Size Considerations for Station Class Arresters

    ArresterFacts 017a   
    Transmission Line Arrester Selectiion Guide

    ArresterFacts 17a Thumb Topics Covered
    1. How to determine the MCOV/Uc
    2. How to select the Energy Rating
    3. How to determine the Margin of Protection
    4. The importance of Failure Mode
    5. Mounting options overview
    Transmission Line Arrester Selection Guide

    What Constitutes an Arrester Failure?

    Arrester Failure Perhaps Do you ever wrestle with the notion of what is a failure when it comes to arresters. This Facebook post discusses the subject a bit. Take the survey and send me the results.

    ArresterWorks on FaceBook

    ArresterFacts_033_Cover To make it easier for all you younger folks that use Facebook all the time, we now have a FB Page as a business...With Facebook at 850 million users, how can we go wrong.........Enjoy

    Januray 2012
    1988 Varistor Conference

    1988 Conference Photo In 1988 the Second and last International Varistor Conference was held in the US. An excellent photo of the attendees exists, however there is no identifying index for the attendees. Can you Identify anyone, if so, please let me know who. The lists and photos are in the History Article section Full photo of Conference List of Attendees    List of Identified Attendees   
    Have a look on History Article Page

    David W Jackson Inducted into Surge Protection Hall of Fame

    Dave Jackson Dave W Jackson's career spanned 61 years. The entire time he was involved in power system design and applicaitons. He became involved in Surge Protection in 1960 and remained active in standards until 2007. Complete Hall of Fame Citation
    Hall of Fame Page

    Prof Hinrichsen Elected Chairman of TC37

    Dave Jackson Professor Volker Hinrichsen has been elected Chairman of TC37 the Arrester Technical Committee of the IEC. Prof Hinrichsen replaces Michele De Nigris who has fulfilled that function since 1990. Prof. Hinrichsen started participating in IEC standards in 1992 and has been co-convenor of IEC TC37 MT4 since 2002 where he has repeatedly demonstrated excellent leadership.  Arrester Standards Page

    History of Arresters Used on Power Systems in the US

    Cover of History Article For the first time, a complete history of surge arrester used on power systems has been published. This history takes you from the first lightning protection devices to the latest polymner housed arresters of today.
    US History of Arresters 1750-1890
    US History of Arresters 1890-1930
    US History of Arresters 1930-1965
    US History of Arresters 1965-Present

    December 2011
    Created the ArresterWorks Virtual Museum

    Pellet Arrester After years of procrastination, I have finally posted the beginings of our Arrester Museum (Virtual Style). The first exhibit is from a 1925-30 vintage Pellet Type arrester from GE. This is only the first of many exhibit postings. We hope to make this a collaborative effort of those that have photos of old arresters and are willing to share them. ArresterWorks will also gladly take donations of old arresters for our Museum and for the display in the virtual museum. Enjoy.....
    -Have a look-

    November 2011
    CEATI Grounding and Lightning Workship Presentation
    I was an invited speaker at the CEATI Grounding and Lightning Workshop to discuss applicaitons on Externally Gapped Line Arresters (EGLA).
    -Have a look-

    October 2011
    Attended IEC TC37 MT4 and MT10 Arrester Standards Meetings
    IEC Test Standard 60099-4 and Application Guide 60099-5 are very close to re-issue. The meetings were to discuss the latest editions. 60099-4 will publish its first CD in January. 60099-5 will publish an FDIS in January. Both documents are major upgrads to the previous documents.
    Attended IEEE SPD Arrester Standards Meetings
    IEEE C62.11 in very close to a new edition that has major improvemements in energy handling tests and methods. This document will be ballotted in the first part of 2012 and should be published in late 2012.

    August 2011

    Lightning Protection of Power Systems - Then and Now - Part 1
    Finally I have found the time to start my Lightning Protection History Article, which I have been wanting to do for 5 or more years. It is coming in three installments over the next 3 months. Thanks goes to Waymon Goch of Classic Connectors Inc for giving me the encouragement to write it. -Have a look-

    Updated Project List
    ArresterWorks isn't only the Best Surge Proteciton Website on the Net, it is First and Formost an International Consultancy focused on Surge Protecton of Power Systems. We have updated our project list to show the type of projects we are engaged in. -Have a look-

    Two New ArresterFacts

    ArresterFacts 028
    Understanding Arrester TOV Responses
    How an arrester responds to power frequency temporary overvoltages (TOV), is seldom discussed in the literature and a phenomenon that is studied even less. This Arresterfacts is a short synopsis of the topic that should introduce the reader to some of the aspects of TOV with respect to arresters -Check it out-

    ArresterFacts 030
    Modeling Temperature Rise of Arresters from Energy Absorption

    This ArresterFacts explains how to predict the temperature rise in an arrester using hand calculations, Excel spread sheet, and ATP models. Several support documents are also availble on the ArresterFacts page including the ATP models. Enjoy -Check it out-
    July 2011
    Lightning Study
    Completed a Lightning Study on a 138kV transmission line in Eastern US.
    After modeling the system in detail, it was concluded that the lines could not be flashing over due to lightning strikes to the shield. Further investigation revealed that the lines were experiencing a shield failure due to construciton over terrain sloping away from the lines. " Arresters to the rescue!!! "

    VI Characteristic Curve
    Published an Excel based App to generate the Voltage-Current Characteristic curve of any arrester desired. It can be used in Modeling Arresters in ATPDraw.
    - Check it out -

    Arrester Temperature Rise Calculator
    Published a second Excel based App that assists transient study experts in modeling the tempreature rise of an arrester after energy absorption.
    - Check it out -


    June 2011
    Forum Entry on Marx Generator
    See my latest entry in the ArresterWorks forum regarding Marx Generators and A Marx Generator ATP Model can be downloaded here.

    Published two new ArresterFacts:
    ArresterFacts 026 Measuring Discharge Voltage on Fast Rising Surges discusses for the first time, the new methods that will be specified in IEEE C62.11 when published in 2013. It also describes how the data shall be published in both IEEE and IEC literature.
    ArresterFacts 027 Reference Voltage is all about the important arrester characteristics Vref that is docummented almost nowhere. This is the most comprehensive treaties of this subject published todate.


    May 2011
    Arrester Standards Development

    Attended both IEC and IEEE Arrester Standards Meetings. There is more going on in these two meetings today than there has been in a long time. Both standards writing groups are producing new test standards and will both publish in 2013. Significant changes in energy and charge transfer withstand will be included in the 2013 edtions.


    April 2011
    INMR World Congress in Seoul

    Chaired the Arrester Session at the 2011 INMR World Congress Seoul South Korea Ten Excellent papers were presented by distinguished industry experts. Bill Chisholm a Canadian Consultant discussed special icing issues relative to line arresters, Plamen Bunov from Siemens presented results of recent tests conducted on the externally gapped arrester, Hans Ove Kristiansen from Doble, offered an interesting overview test methods for monitoring arrester health, Frederic Malpiece of Tridelta France, provided insights into the new energy handling tests as well as offered an overview of MOV disk manufactring, Georgij Podporkin of Streamer Inc, introduced the latest model of line protection arresters based on the multi-chamber concept, Hakan Westerlund from ABB presented an intersting overview of arrester monitoring options and offered an excellent overview of third harmonic measurements, Lars Klingbiel of Siemens presented the latest design details of the ACM, the newest arrester monitor on the market.


    February 2011
    New ArresterFacts

    Published ArresterFacts 025 on Deadfront and Separable Arresters This latest ArresterFacts gives you the basics of the arrester plus shows why it is such an important part of surge protection in underground circuits. Clear plots are shown that demonstrate the voltage doubling effect and how it is mitigated with arresters at or near the open point . Download PDF . View online


    December 2010

    Surge Protection Seminar By ArresterWorks
    March 2011
    Orlando, Florida

    New Topics
    1. Modeling Transmission Lines with ATP
    2. Overview of Latest IEC and IEEE Energy Tests


    November 2010
    IEC Standards Meeting: Berlin Germany There is a significant number of changes in the works on IEC 60099-4. In 2012 when this becomes a published standard, there will be very positive improvements in the way arresters are tested and evaluated. More


    October 2010

    The 2010 North American Arrester Market and Product Report Now Available for Purchase

    2010 North American Arrester Market

    Send Email to for pricing, table of contents, and delivery options.


    September 2010

    Participated in CEATI Conference

    The Lightning and Grounding Committee of CEATI sponsored an excellent workshop on the same subject. ArresterWorks was the Featured workshop for the event.

    Ways ArresterWorks can be of service to you:

    If you are a Manufacturer
    If you are a Utility or Arrester User
    If you are an Educator




    Past Events at ArresterWorks

    Insulation Coordination Study Report for the FAA William J Hughes Technical Center

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    Lightning Study of a 138kV Double Circuit Transmission Line for Dominion Virginia Power

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    Surge Protection Seminar

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    Pole Ground Testing as part of lightning strike investigation

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    Submitted a Paper on C62.11 for Presentation at T and D Conference

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    Insulation Coordination Study of Substation in Alberta Canada

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    Chaired Arrester Session at the INMR World Congress in Seoul South Korea

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    Third Party Factory Inspection Testing for Malaysian Utility TNB