Pre-Coating RTV Silicone onto Glass Disc Insulators

Pre-Coating RTV Silicone onto Glass Disc Insulators

February 18, 2017 • ARTICLE ARCHIVE, Silicone & Other Materials, Utility Practice & Experience Comments (0)

Until recently, most applications of RTV silicone material have been as a remedial measure to mitigate pollution-related flashovers of insulators suffering poor service performance. Indeed, coatings have been viewed for years mainly as a maintenance product applied to substation insulators in polluted areas in place of greasing or washing. By contrast, in situ application of ...

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Research Provides New Insight into Unexplained Line Outages

February 4, 2017 • ARTICLE ARCHIVE, Insulators Comments (1)

Pollution flashovers of insulator strings have historically been one of the main causes of line outages under normal operating conditions. Indeed, years ago this was a relatively common occurrence across many countries suffering from heavy industrial...

HV Cable Accessories of the Future

February 18, 2017 • ARTICLE ARCHIVE, Editorial Columns, Focus on Cable Accessories Comments (0)

Since the introduction of different cable connector systems, the sub-classification of what are commonly referred to as ‘cable accessories’ into joints and terminations no longer seems appropriate. More and more, medium and high voltage cables are being...

Practical Issues for Effective Aerial Patrols of Overhead Lines

February 11, 2017 • ARTICLE ARCHIVE, Maintenance Comments (0)

Detecting damaged or defective line components before they fail and cause serious problems is necessary to ensure the safe operation of overhead networks. It is therefore not surprising that finding reliable methods to inspect lines has always been a priority...

Protecting Overhead Lines & Substations from Wildlife Induced Outages

February 11, 2017 • ARTICLE ARCHIVE, Wildlife Protection Comments (0)

The requirement for more reliable and cost effective power networks continues, with downtime measured (and penalized) in minutes as well as seconds. Over the past 20 years, there has been increasing realization that the uncontrollable external impact of...

Evaluating Reliability of Bushings & Related Case Histories

Evaluating Reliability of Bushings & Related Case Histories

February 4, 2017 • ARTICLE ARCHIVE, Bushings Comments (0)

Resin-impregnated paper (RIP) bushings are now an established solution for many applications. Although such bushings are often referred to as ‘maintenance-free’, some of their parameters must nevertheless be monitored prior to putting them into service...

Thermal Inspections Help Florida Utility Prioritize Maintenance at Substations

February 11, 2017 • ARTICLE ARCHIVE, Inspection, Maintenance Comments (0)

Among the best known technologies to assess the condition of power network assets are infrared and ultraviolet imaging. Both have been used now for decades and rely on specialized cameras that have evolved considerably over the years. The common direction of...

Algerian Grid Operator Focuses on Challenges of Harsh Service Environment

February 4, 2017 • ARTICLE ARCHIVE, Article of the week, Utility Practice & Experience Comments (0)

If someone had to rank transmission service environments across the globe in terms of the severity of their pollution challenges, Algeria would surely find itself near the top of the list. Covering a vast expanse of some 2.3 million sq km, it is the largest...

Comparison of Methodologies to Detect Damaged Composite Insulators

February 18, 2017 • ARTICLE ARCHIVE, Maintenance Comments (0)

As the rate of application of composite insulators on overhead lines has spiraled in recent years, accurate methods to monitor them for critical damage (especially internal defects) have taken on prime importance. Apart from the obvious impact on reliability...

TLA on top phase of Beauly-Denny 400 kV tower.

Experience with Application of TLAs on 400 kV Line

February 18, 2017 • Arresters, ARTICLE ARCHIVE Comments (0)

Lightning has been reported as the main cause of unscheduled outages on overhead sub-transmission and transmission lines (e.g. U.S.: 57%; Brazil: 50-70%; Japan: 70-80%; Denmark: 57%; Colombia: 47-69%). Reducing outages due to lightning has a major impact on...

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