Important Facts You Need To Know About Surge Arrester Currents

Surge Arrester Currents By Waymon P. Goch Discharge current is the surge current that flows through a surge arrester during discharge of an overvoltage surge (and discharge voltage is the voltage that appears across the terminals of an arrester during that time). There are four additional currents that are of significance in the design, application,

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Problem Connectors on Multiple Sub-Conductors

By Carl R. Tamm If you have a line with two or more sub-conductors per phase, and during an infrared inspection, a scenario is found where one of the sub-conductors has a fitting that is hotter than the one next to it, the natural tendency is to assume it is a high resistance connection.  Were

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Surge Arrester Lead Length Revisited

By Waymon P. Goch Surge arrester manufacturers always recommend that line and ground leads be as short and straight as possible in all surge arrester applications. Why? The primary reason is inductive surge impedance. The selection of the best surge arrester for a given application can be negated by poor installation practices. The length and

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Avoiding Splice Failures

By Lisa Nelson, EDM International, Inc. One of the primary root causes for splicing failures is poor cleaning of aluminum strands prior to compression.   The Electric Power Research Institute has developed technology that enables line crews to properly prepare conductors quickly, efficiently and affordably.  Improper cleaning of conductor strands can result in higher resistance terminations

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Corrosion and Splices

By Waymon P. Goch Worldwide, the annual cost of corrosion is $2.2 trillion (US); and is currently estimated to be $429 billion (US) annually in the United States.(1) Corrosion that results in failure of aircraft, pipelines, bridges and other critical structures receives a lot of publicity and attention but other failures that are primarily due

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DO YOU KNOW THE CONDITION OF YOUR SPLICES?

Joe Renowden, Consulting Engineer (Article provided by SensorLink) Why would that question be important when industry wide there have been relatively few failures? The answer is: The risk of failure can’t be managed until the splice’s condition is assessed and characterized. Managing the risk means planned replacement, as opposed to “Uh Oh! Get a crew

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Do You Change the Tires on the Family Auto?

By, Carl Tamm Most of us gray haired guys well remember the advent of radial belted tires!  There was significant skepticism initially, as some of the early models wound up with bulging “pump knots” on the sidewalls, but eventually the problems were ironed out, and the radial tire, along with the non-continuous tread design evolved

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Fault Current versus Distance

Background: A major utility noted that they were having far more splice failures on their 34.5 kV distribution lines within a few miles of the substation than they were toward the end of their circuits. The primary reason is the available system fault current diminishes with distance from the sources. In an attempt to quantify

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The Truth About Infrared Inspections

Hangin’ Your Repairs on Temperature? By, Kimberly Lewis HOT/SHOT Infrared Inspections, Inc. Infrared technology has been heavily utilized by the utility industry for over 30 years and yet it is still vastly misunderstood.  In a perfect world, utility engineers want to qualify the results of infrared inspections and use the temperature data collected from anomalies

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Connectors – The Weak Link

When considering increased conductor temperatures, numerous issues are of concern, particularly with the dynamic effects on electrical connectors when suspended overhead aluminum conductors are operated at high temperatures, specifically above 93°C (200°F). Click here to read the complete article.

Alabama Power Repairs Hot Splice In 8 Minutes and 23 seconds!

Following annual line surveys at Alabama Power, with the discovery of some hot (aged) splices found with IR Thermography, a decision was made to utilize the advantage of a helicopter to quickly and efficiently install ClampStar units over the hot splices to restore their electrical and mechanical integrity.  An EHV Live-Line crew from Haverfield Aviation

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New “CSS” Style ClampStar

Due to popular demand, CCI has developed the New “CSS” style ClampStar units for use on Deadends and Suspension Clamp applications!  Made with a single conductor leg, the new unit installs in minutes, the same as the traditional ClampStar units that are installed over splices. ClampStar CSS Unit Installed on a Deadend Several applications have

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Line Crews Repair Failing Splices with No Power Interruption!

May 01, 2010, Transmission & Distribution World, By Mike Dario, Los Angeles Department of Water and Power Corrosive salt water and high winds in Los Angeles’ beach areas were wreaking havoc on the Los Angeles Department of Water and Power’s automatic quick sleeves. Linemen were noticing more failures of these sleeves, which are spring-loaded with

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ClampStar makes line up-rates possible!

Major Breakthrough With New Cost Saving Connector Technology Propels Classic Connectors, Inc. And Their Revolutionary Product “ClampStar®” Into Electric Utilities Must-Have Product For 2010 For the past several years, utilities have been under considerable pressure to operate aging power lines and equipment at higher levels, forcing them to transport large amounts of energy over an

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Dominion VA Power installs ClampStar in Grandy, NC

The unit was installed on a 477 ASCR conductor, 34.5kV L-L, 19.9kV L-N, over an automatic splice. Including the time for set up, and covering/uncovering the adjacent conductors, the install took 25:19. Once the ClampStar® was loaded in the bucket, the actual install of placing the unit over the splice and tightening the bolts took

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