Benefits Justify Greater Use of Transmission Line Surge Arresters

July 21, 2018 • Arresters, ARTICLE ARCHIVE Comments (0)

Application of gapped (EGLAs) or non-gapped (NGLAs) transmission line arresters offers perhaps the best opportunity for power engineers to improve system reliability. However, the real value of using these TLSAs transcends this one objective. There are a good number of added benefits. This article, contributed by INMR’s arrester specialist, Jonathan Woodworth, reviews a range of ...

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Dielectric Strength & Air Density

July 21, 2018 • ARTICLE ARCHIVE, Commentary by Pigini Comments (0)

While a number of atmospheric parameters can affect the dielectric strength of external insulation, relative air density (δ) and absolute humidity are considered the most significant. Here, I will focus on the former, which plays a key role in developing...

Meeting Modern Challenges in Asset Condition Monitoring & Diagnostics

Modern Challenges in Asset Condition Monitoring & Diagnostics

July 21, 2018 • ARTICLE ARCHIVE, Utility Practice & Experience Comments (0)

Ensuring a high level of availability in supply of electrical power has traditionally been accomplished through sufficient system redundancy as well as specification of only well-proven and sometimes over-dimensioned network components. Intensive manpower and...

Optimizing Safety of HV & UHV Bushings

July 7, 2018 • ARTICLE ARCHIVE, Bushings Comments (0)

Safety is an important factor in the power industry due to the consequences and risks of injury from catastrophic failures of electrical equipment. This aspect must therefore always be taken into account during design – even at the inception of product...

Repair & Re-Coating Techniques for Composite Housings & RTV Coated Insulators

July 7, 2018 • ARTICLE ARCHIVE, Insulators Comments (0)

Silicone rubber has been applied as insulation material in high voltage equipment for decades now because of its advantages, including lower weight and hydrophobicity. However, the weathering resistance of silicone rubber is weaker than that of traditional...

RIS Bushing Technology: Reliability Testing & Field Experience

July 28, 2018 • ARTICLE ARCHIVE, Bushings, Testing Comments (0)

Problems with bushings are one of the leading causes of transformer failure and that means their proper selection can significantly impact transformer and substation safety. Traditional bushing technologies such as oil-impregnated paper bushings (OIP) and...

Protecting Overhead Lines & Substations from Wildlife Induced Outages

July 21, 2018 • 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...

Material & Design Requirements for MV Cable Accessories

July 14, 2018 • ARTICLE ARCHIVE, Cable Accessories Comments (0)

Cable accessories perform the key function of ensuring required insulation either at the connection points of cables (straight joints) or at their ends (terminations). These accessories have to be easy and safe to install over a broad range of different cable...

Using Dielectric Frequency Response to Assess Bushing & Instrument Transformer Insulation

July 21, 2018 • ARTICLE ARCHIVE, Bushings Comments (0)

Modern technology in signal acquisition and analysis techniques has provided new tools for transformer diagnostics. Of particular interest are dielectric response measurements where insulation properties of oil/paper systems can be investigated. Dielectric...

Transition Joints Serve Growing Role

July 7, 2018 • ARTICLE ARCHIVE, Cable Accessories Comments (0)

The population of installed paper-insulated cables at low and medium voltages is estimated to still represent over half of the underground networks in many countries. However, these days, virtually 100 percent of new cable installations are polymeric type....

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