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Welcome to the 35th Electrical Insulation Conference (EIC), a fully sponsored conference of the IEEE Dielectric and Electrical Insulation Society (DEIS). This year we are meeting in Baltimore, Maryland. Baltimore has a long history as an important seaport on the east coast of the United States. Baltimoreans are also serious about their sports which include baseball, football and soccer and their wonderful...
DEIS is the Dielectrics and Electrical Insulation Society whose field of interest includes the study and application of solid, liquid and gaseous dielectrics from the molecular level, to nanostructured materials, to insulation in products and large-scale systems.
Mineral oil has been frequently used in most of high voltage transformers. However, this oil has started to be replaced by vegetable oils. Additionally, different authors have found that mineral oil-based nanofluids have a potential in improving insulating properties of transformer oil. In order to improve the characteristics of a commercial vegetal oil, this work has used TiO2 nanoparticles to obtain...
In the light of insulation breakdown events during commissioning process of UHV GIS equipment in recent years, effects on switching overvoltage when closing no-load GIS bus caused by the pre-breakdown of the circuit breaker was researched in this paper. The conclusions of this paper could be used as reference for the design of AC-UHV GIS equipment and insulation accident prevention.
Silicone rubber composite materials, such as the room temperature vulcanized silicone rubber (RTV) and the high temperature vulcanized silicone rubber (HTV) have been widely used in the field of high voltage insulation for their good surface hydrophobicity and hydrophobicity transfer. To get a comprehensive understanding of the mechanism of their hydrophobicity, it is necessary to analyze their chemical...
High voltage outdoor composite insulators used on transmission lines can be subject to degradation due to electrical discharge activity at the core-sheath interface. A methodology is described to explore the effect of de-bonding or loss of adhesion between the sheath and core in composite insulators. The use of planar geometry materials allows interfacial pressure to be varied and facilitates physical...
Silicone rubber insulators, widely used on transmission lines, are often pecked by birds, which affects their insulation performance. For the power system to run safely, it is necessary to research on mechanical properties of insulators pecked by birds. To access the ability of insulators against birds' pecks, the impact model based on theories of impact dynamics is build. According to the different...
In order to overcome the on-line monitoring system's technical problems for polluted insulators, which are susceptible to EMI(electromagnetic interference), on-site power supply required, poor accuracy and low reliability, this paper proposes an insulator surface ESDD (equivalent salt deposit density) detection scheme for contamination measure based on high humidity-sensitive PI-FBG (Fiber Bragg Grating...
Algae have recently been colonized on insulator surfaces, especially on surfaces of composite and RTV-coated insulators installed in warm and humid regions. The adverse effect produced by algae on hydrophobicity, flashover characteristics, and the material performance of insulators has been previously demonstrated in the laboratory. However, previous studies have not explored the research method for...
With the increase of composite insulators operating years in the grid, the ageing of the silicone rubber materials become a hot research topic. Artificial ageing tests are wildly used methods to assess the long-term operating performance of composite insulators in short time. Salt fog ageing test is an effective method of artificial accelerated ageing test. The 2000h salt fog ageing test for composite...
The tracking wheel method is an elaborate technique for evaluating the quality of non-ceramic insulators. Although it is not required by European standards, there is an interest in its application due to recent problems with the quality of these products. Despite the undeniable long-term positive effects, some utilities consider this method time consuming and expensive, especially when the products...
This paper is aimed at the analysis of partial discharges (PD) that occur at solid/gas insulating system and their development into creeping discharges under AC voltage (50 Hz), in a point-plane electrode arrangement, using the (ϕ q n) (phase, charge, number) matrix. The discharges number and the amplitude of their apparent charges are analyzed versus different parameters namely the applied voltage,...
Electromagnetic interference is a most important cause for wrong alarming and failing to alarm of on-line PD detection in substation. The characteristics of electromagnetic interferences are dynamic change under the influence of many factors, thus the difficulty of its identification and suppression is increased. Therefore, typical substations in geographical position and voltage level was selected...
DC ramped voltage testing is used to assess the condition of the stator windings in high voltage generator stator windings. When used to only assess the ability of an insulation system to withstand a predetermined DC voltage level, the continuous (and usually slow, typically in the order of 1 kV/min) increase in applied voltage combined with the continuous monitoring of the current often allows a...
Influences of external factors on characteristic parameters of metal oxide arrester (MOA), such as temperature, humidity and chargeability, were studied in this paper. The results suggested that: with the increase of temperature, the equivalent impedance of MOA decreased exponentially, and the current characteristic parameters of MOA increased rapidly, while the DC reference voltage could be kept...
The basin-type insulator is one of the most important parts in SF6 gas insulated switchgear (GIS). Flashover of basin-type insulators will cause serious harm to the electrical system. The fact that metallic particle attached to the surface cannot be detected in the delivery test under the standard lightning impulse (SLI) will pose potential threat to GIS. This paper studied flashover characteristics...
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