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transients, distribution systems, power systems reliability, arrester facts, margin of protection, insulation coordination, station arresters, distribution arresters, aresterHome Knowledge Center ArresterFacts Library Useful Links Organizations HV Arrester Suppliers Testlabs Power Related Topics ArresterNews Projects Services eConsulting Services eSeminars Arrester Failure Analysis Insulation Coordination Studies Training Opportunities Substation Assessment Consulting to Manufacturers Consulting to Educators Consulting to Users History Hall of Fame Articles Virtual Museum Standards Resources Dictionary Arrester Selection Guide Photos Lightning Protection CalculatorsSign up for Our Free NewsletterTransient Events Virtual Conference April 7-16, 2021 More Information October 12-13, 2021 More Information Bangkok, Thailand March 27-30, 2022 More InformationCheck out our Facebook Page Coming Soon Webinar Series on Surge Protection of Power Systems MoreWhat’s an Arrester? Our FocusArresterWorks 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...... Arrester Forensics An Evolving Work Model During the PandemicOur 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 www.NemaArresters.org . There are many other educational papers and videos at the Nema site. 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 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 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 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 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 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 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 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...