Category

Understanding Arresters

Understanding the New Energy Handling Tests of IEEE C62.11

There are many parameters of arresters, but its energy rating is near the top in importance. Since arresters are installed on power systems to clamp both lightning surges and switching surges, they can dissipate fairly high levels of energy in the course of this activity....
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Thermal Imaging of Arresters

Thermal imaging is a fast and cost-effective means of quantifying the health of an arrester. This method has been developed over the past 30 years as the use of the thermography equipment has become more effective. Paper on Thermal Imaging of Arresters
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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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