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keywords: Ofil Solar Blind product UV systems NCI defects detection DayCor® corona NDT Corona Discharge Transmission Lines Defect Detection UV IMAGER


Defects in Nonceramic Insulators: Can They be Detected in a Timely Manner?
Abstract: This paper is a continuation of the work reported during the 2004 Daycor users meeting. The electric field measurement method has been explored to determine its potential for timely detection of defects in nonceramic insulators. Various types of defects were simulated and the external electric field was computed. It is shown that the electric field method used presently is not sensitive enough to permit early detection of defective. There is a need for an improved method, perhaps periodic corona inspection could be the answer. S. Gorur and S. Sivasubramaniyam ...»

Effect of Corona on Nonceramic Insulator Housing Materials
Abstract: This paper presents results and analysis of corona studies performed on NCI removed from service as well as on new materials in the laboratory. It has been shown that it is possible to quantify the corona degradation and this could be used to answer important questions like remaining life. The approach can also be used to develop a rapid screening method for evaluating the corona resistance of materials used for NCI housings. B. Pinnangudi and R. S. Gorur ...»

Transmission Line Insulator Condition Monitoring
Transmission line insulator condition monitoring is of increasing interest with the ageing of many transmission lines constructed since the 1950s. Porcelain and toughened glass and more recently polymeric insulators all have characteristic degradation and pollution modes that must be considered by asset managers. Following the recent inspection of some 220 kV Transmission Line Insulators it is useful to summarise current understanding of ceramic insulator degradation and condition assessment. B. David Stuart McLennan – SP AusNet ...»

Corona Rings: Are They Needed?
Mar 1, 2010 12:00 PM By Raymond Ferraro, Public Service Enterprise Group; Emilie Dohleman, Public Service Company of New Modeling predicts corona levels based on configuration, hardware and line voltage. (march 2010 | ) ...»

ADSS and Corona
AbstractFiber optics can offer a unique solution to the ever increasing demand for bandwidth because of its remarkably high capacity for carrying data; The immunity of fiber optics to electromagnetic interference is another advantage. However, integrating fiber optic cables into high-voltage corridors also poses some technical and safety-related challenges such as corona and dry-band arcing phenomena. When ADSS fiber-optic cables are installed improperly on high-voltage transmission lines, unexpected failures can destroy high-speed and high-capacity communication channels. ...»

NCI Aging - Environmental Factors
Abstract:Ceramic and glass insulators are being substituted by composite insulators due to their low weight, high resistance to pollution and vandalism and for their lower installation costs. Yet their in-service lifetime is shorter due to aging processes. Aging is a natural process that although cannot be stopped can still be controlled. Corona cameras are being utilized by electrical engineers to identify those processes, control them and prevent major damage. In particular, daytime corona cameras are very much efficient because they let clearly see and document indications of an existing problem and/or a developing problem. ...»

Airborne Inspection
Abstract: Aerial inspection is an efficient way to maintain the grid when considering labor cost, time consumption, distances, topographic barriers and safety due to the high towers and long distances. Ofil offers several aerial solutions. ...»

Factors Affecting UV Inspection Results
Abstract: In a research conducted lately by CEPRI – China Electric Power Research Institute that was presented at the SPIE 2014 conference, the use of Ofil's DayCor® Superb was analyzed. The purpose of the study was to establish operating principles taking into account the influence of external factors such as: inspection distance, inspection angle, camera gain settings and ambient conditions. The study concluded that when performing comparative corona inspection of electrical apparatuses conditions should be kept similar (if not identical) and always documented. ...»

Combined Multi Sensors Inspections
"Each has its advantages and disadvantages yet the multi-spectral method combines the 3 effectively to improve the detection accuracy" ...»

The Feasibility of Using Daytime Corona Inspection to Identify Contaminated Insulators That Need to Be Washed
Abstract In areas plagued by contamination related flashovers, it is a challenge to decide when to was the transmission line or substation insulators. An experimental study has been performed to investigate the feasibility of using daylight corona detection as a means to identify insulators that needs to be washed. Product ID: 1013675
Sector Name: Power Delivery & Utilization
Date Published: 6/9/2006, Document Type: Technical Update, File size: 3.26 MB, File Type: Adobe PDF )

The Ultraviolet Detection of Corona Discharge in Power Transmission Lines
Abstract: Corona discharge is a common phenomenon in power transmission lines external insulation, and it may cause serious defect if without effective detection. The ultraviolet (UV) imagery technology has been widely used to detect the corona discharge in industry in recent years, but some influence factors' functions are not definite. In this paper, the fracture aluminum strands which is common in power transmission lines were used as the electrode model while a SuperB ultraviolet imager were utilized to detect, the photon count rate was detected with different detect distance, electric field, aluminum strands length and UV gain were applied. Then the multivariate regression analysis (MRA) was taken to calculate the function between the photon count and the factors.Lan Chen, Lin Lin, Mimi Tian, Xingming Bian, Liming Wang, Zhicheng Guan ...»

How Corona Discharges Affect Smart Grid
Abstract: Reliable operation of a Smart Grid means constant on going synchronization and compensation processes that are heavily dependent on communication. Electrical noise can originate in consumer loads such as electronic devices, or in natural events like lightning. Most typical noise sources such as voltage fluctuations, switchgear noise, and power surge are lower than 100MHz, while, corona and arcing or lightning produce noise that extends up to 2GHz. In fact, corona is renowned as one of the major radio frequency (RF) interference nuisance due to its prolonged radiation of periodic broadband spectrum. ...»

DayCor® Rail - Targeted Analysis of Corona in Overhead Electrical Systems
Abstract: DayCor® Rail is a corona detection driven system dedicated to assist electrical railways management maintain ongoing safe operation of their mass transportation networks. Rail combines monitoring, processing and reporting modules that interact automatically to supply in real time information about the condition of overhead catenary systems. ...»

Stability vs. Power Loss – Cost Considerations
Abstract: Corona is one of the known causes for power loss. Corona losses occur when there is an electric current flowing to the ground through the air. Extreme weather conditions such as rime, fog, heavy rain and wet snow can cause a significant increase of corona losses, but these are seasonal temporary conditions. On the other hand corona losses incurred as a result of known local environmental factors that enhance corona, such as humidity, contamination and exposure to salty mist in coastal areas, as well as improper installations, erroneous design, unfit components etc., can be controlled and minimized. ...»

Case Study for Using & Monitoring Composite Insulators on Overhead Lines under Natural Pollution
Abstract: Acquired by TAESA in 2010, the 500 kV Xingó Angelim II Transmission Line (TL), 193 km long, passes through Alagoas, Pernambuco and Sergipe states, on the Brazilian northeast. Since its commercial operation in 2002, many shutdowns related to natural pollution occured due to low rates of precipitation and a high dew occurrence. Glass insulators were replaced by polymeric insulators solving the problem for 3 years. A year later there was an increase in outages in additional locations. a Study was conducted using corona cameras. As a result, the team identified that a decrease in rainfall during 2016 was the cause of outages in that region. New insulator that fit highly contaminated areas were installed, new inspection standards were defined". ...»


Missing Corona Rings