Reliable operation of transmission and distribution systems depends on correct selection of insulators. But proper dimensioning can be a challenge since it requires knowledge of both site contamination and insulator withstand to specific types of contaminants. Moreover, contamination level depends on a number of site-specific parameters. Wind, rain,...
On 22 Dec. 2005, a severe snowstorm in northern Japan led to one of the country’s worst long-term outages in decades and impacted the Niigata Kaetsu region supplied by Tohoku Electric Power Co. About 650,000 households were affected over a maximum duration... Read More
When there are two alternative technologies that each somehow complement the weakness of the other, combining them would seem the logical solution. This applies to traditional ceramic insulators and silicone rubber material. Porcelain and glass insulators... Read More
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... Read More
Among the challenges when it comes to insulator design for UHV applications is to fulfil required lengths while also mitigating resulting negative effects on insulation and mechanical performance. Efforts can be made in system design to reduce levels of... Read More
Partial or complete bridging of insulator dry arc distance by ice or snow can lead to greatly reduced electrical reliability, particularly in the transition temperature range between -2 to 0°C. As example, a severe snowstorm in northern Japan a decade ago... Read More
Application of silicone rubber composite insulators has increased significantly over the past 30 years and among the essential factors behind continued growth is the confidence shown in them by power utilities. This edited article, contributed to INMR by... Read More
Guidelines for insulator selection under pollution in AC are already available in IEC 60815 series 1, 2 & 3 and work is underway in IEC TC 36-WG 11 as well as in CIGRE WG C4-03-03 to extend them to DC. While these guidelines are intended to simplify... Read More