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Ofil Systems

Verifying Corona, Pollution & Icing Performance of Insulation Structures

Use of composite insulators has increased rapidly. Historically, the main driver was excellent performance in polluted areas. But a more recent application has been in clean environments, where composite insulators provide possibilities to design more... Read More

Corona Cameras Help Inspect Composite Insulators

Development of latest generation compact UV cameras has been a positive development for utilities, allowing for more practical routine inspection of lines and equipment. For example, it has not always been possible to say anything definitive about the... Read More

Protecting Composite Insulators from Corona

One of the important design differences between silicone composite insulators and porcelain cap & pin or long rod types is their smaller shank diameter, made possible by the high strength glass-fibre reinforced core rod. This contributes to superior... Read More

Corona Shielding for HVDC Line Insulators

Power utilities and insulator manufacturers continue to express differing views as to the relative value of shielding electrodes in DC. Back in 1972, significant laboratory research had already been undertaken on the influence of shielding and grading... Read More

Comparing UV & IR Diagnostic Inspection of Lines & Substations

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... Read More

Failures on 400 kV Lines in Venezuela Highlighted Importance of Corona Rings on Composite Insulators

It is already well known that composite insulators used at transmission voltages have to be equipped with co-rona rings to reduce the risk of severe erosion to their polymeric housings. Yet, there are still cases where such insulators are either installed... Read More

Detecting Corona with UV Cameras

Currently, CIGRE WG D1.61 is dealing with the topic of optical detection and measurement of corona. Several ultraviolet (UV) cameras are now available commercially (both night vision and daylight types) and there is ongoing discussion about whether optical... Read More

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