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Corona Camera Supplier Extends Product Range

March 4, 2017 • ARTICLE ARCHIVE, Corona, Maintenance Comments (0)

Mitigating the presence and impact of corona on overhead lines and at substations is among the important tasks confronting power system operators. The reason for this is that, if left unchecked, corona can lead to a variety of problems, including progressive degradation and eventual failure of certain types of insulation. In 2015, INMR traveled to ...

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Opportunities for Re-cycling Insulators & Components

Opportunities for Re-cycling Insulators & Components

March 4, 2017 • ARTICLE ARCHIVE, Insulators Comments (0)

Transmission and distribution utilities have become a significant source of waste materials including scrap components such as ceramic insulators and bushings, instrument transformers, protective equipment, etc. However, there are currently few if any...

Comparing UV & IR Diagnostic Inspection of Lines & Substations

March 11, 2017 • ARTICLE ARCHIVE, Inspection, IR, Maintenance, UV Comments (0)

One of the issues in maintenance of overhead lines and substations relates to better understanding what is being revealed during ultraviolet or infrared inspections of equipment and hardware. Do these two technologies highlight the same problem or are they...

Lightning & Its Impact on the Distribution Network in Florida

Impact of Lightning on Distribution Network in Florida

March 18, 2017 • ARTICLE ARCHIVE, Utility Practice & Experience Comments (0)

The service territory of Florida Power & Light (FPL) encompasses 27,000 square miles, generally along the coast, serving approx. 4.8 million customers. Its Distribution Business Unit (23 kV and below) is responsible for more than 1 million poles and some...

Research Provides Insight into Unexplained Line Outages

Research Provided Insight into Unexplained Line Outages

April 1, 2017 • ARTICLE ARCHIVE, Article of the week, Insulators Comments (0)

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...

Diagnostic Measurement & Monitoring of HV Bushings

March 25, 2017 • ARTICLE ARCHIVE, Bushings Comments (0)

Measurement of capacitance and dielectric dissipation factor (power factor) is a proven diagnostic to assess the condition of high voltage bushings. In the past, dielectric response measurements in the frequency domain with frequency domain spectroscopy (FDS)...

Designs & Applications for Station-Class Polymeric Surge Arresters

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

Polymeric-housed surge arresters have already completely taken over the market at distribution voltages but this is still not the case for HV applications where they share the market about equally with porcelain. Nevertheless, the technology of polymeric HV...

Switching & Lightning Protection Using Externally Gapped Line Arresters

March 4, 2017 • Arresters, ARTICLE ARCHIVE Comments (2)

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...

Porcelain Suspension Insulators: Microscopic Details Can Impact Service Performance

March 11, 2017 • ARTICLE ARCHIVE, Insulators Comments (0)

The porcelain cap & pin suspension insulator with cemented hardware was introduced a century ago. The external details of modern designs of this type of insulator (also commonly referred to as bells, discs or units) look almost identical to the original...

Experience in The Netherlands with Wintrack Aesthetic Transmission Tower Designs

Service Experience with Hollow Composite Insulators

March 11, 2017 • ARTICLE ARCHIVE, Insulators Comments (0)

Application of hollow core composite insulators has been growing rapidly – some think exponentially. While in 1993 only some tens of thousands of units were in service, that population has since soared to well over a million, with most installations taking...

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