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Failure Triggered Insulator Replacement & Inspection Program

The mechanical failure of an I-string insulator on a 500 kV line in southern China was not linked with a manufacturing defect but rather to erosion of the silicone sheath due to intense corona discharges. Read More >

Arrester Protection of Lower Voltage Circuits on Multi-Voltage Towers

Line surge arresters offer an opportunity to retain the benefits of improved electromagnetic coupling of lightning to a HV circuit while mitigating induced and backflashover overvoltages on a MV circuit on the same structure. Read More >

Development of Polymeric Insulation for Today’s Network Requirements

Optimizing RTV Coatings at 400 kV Substations Under Coastal Pollution

Influence of Shed Profile on Pollution Performance of Composite Insulators

Bushing Failure Modes Detected with Online Monitoring (Video)

Comparative Testing of Helical & Concentric Shed Profiles on HV Bushings (Video)

in Bushings

Full-scale comparative testing was performed on commercially available transformer bushings during heavy rain after complete loss of hydrophobicity. Read More >
Test Requirements for HV Bushings

in Bushings, HV/HP Testing

Although bushings generally account for only 5 to 8% of the total installed cost of equipment, bushing failure can result in loss of costly assets with potentially long replacement lead times. Read More >
Manufacture of Porcelain Insulators

in Insulators

Due to continuous refinements in composition, processing and testing, modern electrical porcelain has remained the most widely used insulator technology found at substations the world over, in spite of growing inroads by advanced alternative technologies. Read More >
Dimensionamiento de pararrayos para sistemas de subtransmisión que utilizan transformadores de puesta a tierra

in Aisladores, INMR Español

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Technical Review of RTV Insulator Coatings

in Insulators

Different maintenance practices have been developed for HV insulators operating in polluted environments. Read More >
Bird Hazards to Transmission Lines

in Wildlife Protection

Birds present a persistent threat to the safe operation of overhead transmission lines and are a significant factor behind line tripping. Read More >
Composite Insulating Cross-Arms for 400 kV Lattice Towers

in Utility Practice & Experience

A great deal of research has been devoted to finding tower designs that utilize composite cross-arms to replace insulators as well as traditional steel cross-arms. 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 >
Understanding Energy Rating of Distribution Arresters

in Arresters, Editorial Columns, Woodworth on Arresters

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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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