Thermal Inspections Help Florida Utility Prioritize Maintenance at Substations

November 18, 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 the latest generations of these cameras are towards more portability, improved data storage and ...

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Overview of Test Requirements & Case Histories for HV Bushings

Overview of Test Requirements & Case Histories for HV Bushings

November 18, 2017 • ARTICLE ARCHIVE, Bushings Comments (0)

Bushings are key components of HV substation equipment such as transformers and switchgear, allowing conductors to transfer energy from one insulating medium to another. Most typically, this will be from an oil or SF6 insulation environment to air. Bushings...

Wireless Leakage Current Monitors to Improve Network Performance

November 5, 2017 • ARTICLE ARCHIVE, Utility Practice & Experience Comments (0)

As part of a program to provide an infrastructure for transmission line and substation monitoring, EPRI in the U.S. has been developing remote sensors to monitor the condition of important assets. This INMR article from 2015, contributed by Andrew J. Phillips...

Safety Testing of HV Cable Terminations, Bushings & Arresters

November 11, 2017 • ARTICLE ARCHIVE, Article of the week, HV/HP Testing Comments (1)

Several years ago, a HV cable termination operating in a Mediterranean country experienced catastrophic failure, scattering high velocity porcelain shards in all directions. The installation was next to a parking lot but fortunately the failure occurred when...

Using Dielectric Frequency Response to Assess Bushing & Instrument Transformer Insulation

November 25, 2017 • 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...

RIS Bushing Technology: Reliability Testing & Field Experience

November 5, 2017 • ARTICLE ARCHIVE, Bushings 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...

Switching & Lightning Protection Using Externally Gapped Line Arresters

November 5, 2017 • Arresters, ARTICLE ARCHIVE Comments (0)

The goal of a lightning proof transmission line has been attainable since the early 1990s when the first polymeric-housed transmission line arresters became available. Indeed, based on IEEE 1410 and IEEE 1243, installation of arresters on every phase of every...

A Review of Insulator Failure Modes

November 11, 2017 • ARTICLE ARCHIVE, Article of the week, Insulators Comments (0)

There are three proven insulator technologies being deployed in delivery of electrical power throughout the world. Porcelain and glass insulators have been used since the start and have had a very good record of performance and reliability. In fact, the...

Identifying Quality Surge Arresters

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

Power system engineers all face a similar dilemma at one time or other when trying to identify which product offers the quality they require – especially in today’s global market with its many competing suppliers. Yet making the right decision can prove...

Protecting Overhead Lines & Substations from Wildlife Induced Outages

November 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...

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