AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |
Back to Blog
Inmr overlaying1/5/2024 ![]() Most commercial grade lenses in binoculars and camera lenses are poorly transparent for ultraviolet radiation and suppress any UV discharges that might be seen with such equipment.Īcoustic detection of electrical discharges was the earliest technology to link lightning flashes and the associated sound of thunder. Hence, shorter or longer wavelengths go undetected. Emissions at those short wavelengths are barely visible since receptors in the eye are sensitive only from 400 to 700 nm. The nitrogen molecules emit photons mainly in the ultraviolet region, with dominant peaks at 298 nm, 347 nm and 358 nm. During the ionization and de-ionization process, photons are emitted to the surrounding air at a wavelength characteristic of the spectroscopic properties of nitrogen. UV discharges are generated by high electric field that surrounds HV equipment and ionizes nitrogen molecules in air. Understanding the technology to visualize corona requires knowledge of the physical process of UV discharge generation as well as of the electro-optic principles for detection. Examples of corona-induced damage to sheds near live end of composite insulator. The term ‘corona’ is now commonly used to describe electrical phenomena that occur either internally or externally in or on network components, resulting in UV discharges. Years later, as sources of high voltage electricity were developed, the same light-like phenomena were observed in the laboratory and also referred to as corona. Because the rounded head of the mast wore this light like a crown, it was later referred to using the Latin word, corona. They associated this with benign protection and named it after their patron saint, St Elmo. Principles of UV Discharge Generation & Detectionĭuring stormy weather, sailors noticed flame-like reddish or bluish lights on the tops of masts and on the end of yardarms. Mahatho of Eskom in South Africa reviewed the technology behind visualization of problems on energized components and equipment using corona and thermal imaging. This edited past contribution to INMR by N. At the same time, it is easier to assess the severity of a problem if it can be seen and compared against visual results of the same defect. Often, the sources of hotspots and UV discharges are also different and this requires different technologies to visualize them. The advent of modern corona imaging systems changed that since knowing that there is corona discharge present and finding its location and cause are different challenges. But past methods of corona detection, including audible noise, were not always able to pinpoint the source or location of discharge. Thermal imaging using infrared (IR) detectors has been used for years and enables location of high temperature problem areas or ‘hotspots’. Given this, being able to efficiently visualize their source has long been a goal of power engineers. Ultraviolet (UV) discharges and thermal hotspot activity are indicators of defects on high voltage components.
0 Comments
Read More
Leave a Reply. |