Surge Protection Educational Series

If you are ever involved in the application, purchasing, or specification you will find this NEMA-sponsored video series informative. The series consists of six interrelated videos and supporting papers of the same name. The videos are a quick look at the topics covered in each...
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What to Look for in a Good Quality Arrester

View in PDF Format All good quality arresters have much in common. This first in a series of articles, sponsored by NEMA Surge Arrester Section members, covers what to look for in that quality arrester. Introduction We’ve all been there before. Which product offers the best...
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What to Look for in a Good Quality MOV Disk

View in PDF Format The Metal-Oxide Varistor (MOV) A quality arrester starts with a quality disk. A quality disk starts with quality raw materials and a solid design. The size of a disk does not indicate quality in any way if it is applied correctly. The disk in Figure 1 is a...
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What to Look for in a Good Quality Supplier

This is the third in a series of four guidance documents on quality and arresters. The first is “What to Look for in a Good Quality Arrester,” followed by “What to Look for in a Good Quality Disk.” The final document is “Understanding Arrester Datasheets.”
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Understanding the Arrester Datasheet

Part of selecting a good quality arrester is understanding the published data. A good quality supplier will fully disclose the relevant data in a format that is comprehensible and user-friendly. This article is a guide to understanding the arrester datasheet and what is behind it.
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The Many Uses of Transmission Line Arresters

It was not realized at the time, but the 1992 introduction of the polymer-housed transmission line arrester (TLA) was clearly a game changer in the practice of lightning protection of transmission lines. Overhead shield wires had been the only cost-effective means of mitigating...
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The Lightning-Proof Distribution Line

In the U.S., the distribution transformer is effectively lightning-proof when protected by a tank-mounted metal-oxide varistor (MOV) arrester. Even if the arrester fails, the transformer will have been protected in the arresters last action. In the U.S., the power transformers...
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