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Repairing RTV Coated Insulators & Composite-Housed Bushings

February 17, 2018 • ARTICLE ARCHIVE, Bushings, InsulatorsComments (0)

Silicone rubber has been applied for decades as an insulation material for high voltage equipment because of its lower weight and lasting hydrophobicity. However, silicone’s resistance to weathering is weaker than that of traditional ceramic insulating materials such as porcelain and glass. While a ceramic insulator is expected to have a lifespan of at...

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Australian Substation Focused on Environmentally-Sensitive Design

February 17, 2018 • ARTICLE ARCHIVE, Utility Practice & ExperienceComments Off on Australian Substation Focused on Environmentally-Sensitive Design

One of the important trends in design of new overhead lines over the past 20 years has been development of structures and designs that are less obtrusive and more pleasing visually. Much the same process has also been going on at substations. For example,...

Application of Station Class Arresters on Underbuilt Distribution Lines

February 17, 2018 • Arresters, ARTICLE ARCHIVEComments (0)

Current protection systems for distribution networks are typically designed to handle fast-impulse overvoltages, such as from switching and lightning, but not power frequency overvoltages that are relatively long duration. For example, should contact occur...

INMR 25th Anniversary Special Edition POWER ENGINEERS HANDBOOK

February 17, 2018 • ARTICLE ARCHIVEComments Off on INMR 25th Anniversary Special Edition POWER ENGINEERS HANDBOOK

In April 2018, INMR will publish its unique 25th Anniversary Special Edition INMR POWER ENGINEERS HANDBOOK, consisting of 18 Chapters on topics from line and substation design to measuring and designing for pollution to the latest technologies for insulators,...

Transformer Bushing Reliability Survey & Risk Mitigation Measures (Part 2 of 2)

February 17, 2018 • ARTICLE ARCHIVE, BushingsComments Off on Transformer Bushing Reliability Survey & Risk Mitigation Measures (Part 2 of 2)

Statistics show that bushings are one of the main contributors to transformer failure. Their failure therefore has huge impact on reliability as well as safety of the system and operators managing the asset. With this in mind, major utilities in southeast...

Selecting Insulation for Overhead Lines & Substations in Russia

February 17, 2018 • ARTICLE ARCHIVE, InsulatorsComments (0)

The Federal Grid Company of the Unified Energy System (FGC UES) operates the electrical transmission grid in Russia and is among the world’s largest companies transmitting power by overhead lines from 220 kV to 750 kV. It is also ranked near the top in...

Mitigating Lead Stresses on Line Arresters

February 10, 2018 • Arresters, ARTICLE ARCHIVEComments (0)

Transmission line surge arresters (TLSAs) are applied on overhead lines to improve outage performance and, particularly in the case of EHV, also to limit the magnitude of switching overvoltages. There are two basic types: externally gapped line arresters...

Coating Insulators with RTV Silicone in the Factory

February 10, 2018 • ARTICLE ARCHIVE, Scene from ChinaComments (0)

RTV silicone anti-pollution flashover coatings have been used extensively for years – initially mainly on post insulators and bushings at substations and more recently also for porcelain or glass string insulators on transmission lines. One of the reasons...

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