2024
conference-paper
OpenAlex
Ernst Peter Pagger, Norasage Pattanadech, Michael Muhr, Michael Tieber et autres
Because of the aim for safe, sustainable, and environmentally friendly production, transmission, and distribution of electricity, the use of biological insulating liquids is increasing. This is reflected in the increasing number of suppliers of these liquids and the quantities being used in …
at, th
(code pays fourni par la source)
2023
conference-paper
OpenAlex
Ruifeng Wang, Zhiqiang Huang, Kevin James Rapp, Yunpeng Liu
Natural ester insulating liquids have gained attention from the global power industry in recent years, and until today, the highest voltage level of in-service natural ester immersed transformer is 420kV. Many concerns are raised to explore higher voltage level and essential evaluations …
cn
(code pays fourni par la source)
2022
conference-paper
OpenAlex
Alan Sbravati, Kevin James Rapp, Kévin Wirtz
A transactions article on Power Delivery published by William J. McNutt in 1992 [1] was a milestone for the insulation thermal life discussions. Reviewing historical data starting back in 1916, the author starts his article clarifying the differences between the transformer functional …
us
(code pays fourni par la source)
2022
conference-paper
OpenAlex
Alan Sbravati, Roberto Ignacio, Kevin James Rapp, Kévin Wirtz
After testing several dozen transformers in the factory, one of the first commercial natural ester-filled transformers was installed in a large amusement park in 1997. This 1500 kVA, 12.47 kV - 480/277 V transformer has remained in service under continuous operation without …
us, nl
(code pays fourni par la source)
2022
conference-paper
OpenAlex
Luigi Calcara, Massimo Pompili, Kevin James Rapp, Alan Sbravati et autres
The employment of natural and synthetic ester liquid as dielectrics in electrical equipment is increasing in the latest decades. They have higher fire and environmental performances if compared with the most used traditional mineral oils. Natural and synthetic esters are designed to …
it, us, fr
(code pays fourni par la source)
2022
conference-paper
OpenAlex
Wei Zhang, Ruikang K. Wang, Kevin James Rapp, Luo Wei et autres
The power industries of China have been growing rapidly for more than 40 years, and now the electricity consumption and power grid size of China tops the world. A sizable fleet of transformers are left idle because they lack the appropriate unit …
cn, in, us
(code pays fourni par la source)
Accès ouvert
2022
article
OpenAlex
Yuan Wang, Ruifeng Wang, Kexin Pan, Yang Xu et autres
Abstract Several retrofillings have been performed by different utilities in China. However, there is still insufficient understanding of the retrofilling procedures for minimising residual mineral oil and on the effect of the temperature rise of transformers. Following new detailed procedures, an out‐of‐service …
cn, us
(code pays fourni par la source)
2020
conference-paper
OpenAlex
Ernst Peter Pagger, Michael Muhr, Norasage Pattanadech, Peeraphong Kongdang et autres
Water has a great influence on the properties of insulating liquids, but this influence does not always have the same impact on the insulation system. Depending on what kind of insulating liquid is used the influence can be more or less. Liquids …
at, th, us
(code pays fourni par la source)
2020
conference-paper
OpenAlex
Luigi Calcara, Alan Sbravati, Kevin James Rapp, Massimo Pompili
Partial Discharge Inception Voltage (PDIV) and AC breakdown voltage in insulating liquids are important indicators used for representing their integrity. The test procedures for the determination of these indicators are described in IEC TR 61294 (Determination of the Partial Discharge Inception Voltage) …
it, us
(code pays fourni par la source)
2020
conference-paper
OpenAlex
Philip Hopkinson, Daniel Mulkey, Kevin James Rapp
Transformer kVA is defined as the amount of output power that can be delivered without exceeding nameplate temperature rise. Materials improvements have led to greater output ratings and smaller physical sizes. However mandatory energy efficiency requirements by the US DOE and physical …
us
(code pays fourni par la source)
Accès ouvert
2020
article
OpenAlex
U. Mohan Rao, Issouf Fofana, Abderrahmane Béroual, Paweł Rózga et autres
In view of the contemporary scenario and importance of alternative liquid dielectrics, IEEE DEIS Technical Committee on Liquid Dielectrics laid emphasis on pre-breakdown phenomena of ester dielectric fluids. The present article reports the background knowledge on the breakdown theories and behavior of …
ca, fr, pl, it, us
(code pays fourni par la source)
2020
conference-paper
OpenAlex
Zhiqiang Huang, Ruifeng Wang, Kevin James Rapp, Gang Liu
With the growing global interests on natural ester insulating liquids advantages, China is very actively promoting this technology in liquid-filled transformers. The major power grid utilities, like SGCC and CSG, have published their corporate purchase specification standards for 10kV natural ester filled …
cn
(code pays fourni par la source)