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Transmission Asset Planning, Management & Refurbishments (Video)

Most electrical infrastructure (at least in North America) has a high percentage installed in the 1950-1970s and, with typical life expectancy of 50-75 years, the end-of-life is nearing for a very large asset base. Read More >

Pollution Design of HVDC/UHVDC Outdoor Bushings

Different bushings are used to connect the AC line to the DC line at HVDC substations. Depending on converter station design, these can be placed indoors or partially outdoors and therefore exposed to ambient pollution. Read More >

Comparing UV vs. IR Inspection of Overhead Lines & Substations

Reducing Transmission Line Costs by Optimizing Insulator Design & Material

Arrester Protection Distances at Substations

Silicone-Coated Glass & Porcelain Insulator Performance (Video)

Testing 320 kV HVDC XLPE Cable

in All Articles, HV/HP Testing

Since field distribution in an HVDC cable is determined by resistivity of the insulation material, which varies with temperature, there is the need to control temperature difference during thermal stresses represented by the load cycle during testing. Read More >
Shielding Failures & Stroke Flashovers

in Transient Thoughts

About 20 years ago, researchers in japan began observing direct lightning flashes on prototype double circuit lines that were constructed to ultra-high voltage dimensions but operating at 500 kV. Read More >
Seismic Performance of Porcelain Insulators at Substations

in Insulators, Substations

There have been great advancements in understanding the seismic events that impact insulators at substations. Read More >
Coating Glass Insulators to Resolve Insulation Problems in High Pollution Environments

in Coatings, Glass, Insulators, Pollution

Pollution has had an important impact on insulators installed across the transmission network of the Spanish TSO, Red Eléctrica de España. Read More >
Price & Quality of Electrical Insulators

in All Articles, Insulators

There is a general assumption that a high price is always good for the seller while a low price is always good for the buyer. Read More >
Principales modos de falla de los pararrayos contra sobrevoltajes

in INMR Español, Pararrayos

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Chemistry & Properties of Silicones

in Silicone & Other Materials

In contrast to other polymeric insulation materials, silicones are not made up of a carbon to carbon backbone but rather consist of repeating silicon-oxygen groups with two methyl groups each bonded to the silicon. Read More >
Type & Commissioning Testing of High Voltage Cables

in Cables & Accessories

Extruded XLPE cables in underground transmission systems now account for the vast majority of new installations. Read More >
Corona & RIV Testing of Transmission Line Assemblies

in Corona

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About us

INMR offers expert independent technical content for T&D engineers and professionals. Special emphasis is on design, operation and maintenance of overhead lines, substations and power cable networks as well as on testing and certification of key components such as insulators, surge arresters, bushings, power cables and cable accessories, and more.

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