INMR

05/16/2024

Safety has become near the top of the list of considerations driving the current market trend toward composite hollow core insulators.

Edited past contribution by experts at Hitachi Energy as well as the late Richard Martin

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Where superior pollution performance is key criteria, electrical apparatus is now being ordered equipped with hollow composite insulators.

05/03/2023

Electrical activity on the surface of an insulator depends on the nature and state of the pollution deposit on the surface, on atmospheric conditions as well as on the design and type of insulator material.

Electrical activity on the surface of an insulator depends on the nature and state of the pollution deposit on the surface, on atmospheric conditions as well as on the design and type of insulator material.

05/02/2023

Hydrophobicity is a critical factor and must be guaranteed over the entire life cycle of a polymer insulator, even when exposed to severe environmental stresses. If hydrophobicity is lost due to ageing, leakage currents can flow through the moistened pollution layer.

Hydrophobicity is a critical factor and must be guaranteed over the entire life cycle of a polymer insulator, even when exposed to severe environmental stresses. If hydrophobicity is lost due to ageing, leakage currents can flow through the moistened pollution layer.

04/17/2023

Learn more about this skills-building technical Conference & Exhibition covering key topics in Transmission & Distribution

Click for more information: www.inmrworldcongress.com

04/13/2023

Catastrophic failure of an oil-insulated HV cable termination can launch porcelain shards at high velocity in all directions. While rare, this is a reminder of the risks should arcing occur inside a porcelain-housed component filled with oil or pressurized gas.

Testing and certification are important tools to ensure both the safety and reliability of electrical networks.

04/12/2023

Dry type cable accessories offer environmental and safety benefits compared to oil-insulated conventional outdoor terminations. The challenge has been that any new dry insulating material needs to offer not only high dielectric strength but also good thermal conductivity.

Dry type cable accessories offer environmental and safety benefits compared to oil-insulated conventional outdoor terminations.

04/09/2023

In cap & pin suspension insulators, electrodes are separated by only about 2.5 cm of porcelain, subjecting the dielectric to considerable electrical stress. The failure mode of most interest is therefore puncture. Punctured units can lead to dropped conductors and decreased life for the remainder of the string
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In cap & pin suspension insulators, electrodes are separated by only about 2.5 cm of porcelain, subjecting the dielectric to considerable ...

04/08/2023

Resin-impregnated paper bushings are an established solution for many applications. Although often referred to as ‘maintenance-free’, some of their parameters must nevertheless be monitored prior to putting them into service and on a regular basis thereafter.

Resin-impregnated paper bushings are an established solution for many applications. Although often referred to as ‘maintenance-free’.

04/07/2023

Silicone rubber has long been applied as insulation material for high voltage equipment due to being light in weight and offering lasting hydrophobicity. However, its resistance to weathering is much weaker than for porcelain or glass.

Silicone rubber has long been applied as insulation material for high voltage equipment due to being light in weight and offering ...

04/06/2023

Explosive failure involving porcelain-housed arresters presents an unacceptable risk not only for maintenance staff but also for nearby apparatus. In addition, ageing arresters mean reduced overvoltage protection, especially for older equipment, and this can result in accelerated degradation of their insulation systems.

Explosive failure involving porcelain-housed arresters presents an unacceptable risk not only for maintenance staff but ...