Evaluation of High Temperature Operation of Natural Ester Filled Distribution Transformers

2018 ◽  
Author(s):  
Chinmay V Vaidya ◽  
George G Karady ◽  
Alan Sbravati ◽  
Jeff Valmus ◽  
Michael Dyer
Keyword(s):  
High Temperature ◽  
Distribution Transformers ◽  
High Temperature Operation ◽  
Natural Ester

scholarly journals Dual-Temperature Evaluation of a High-Temperature Insulation System for Liquid-Immersed Transformer

Energies ◽  
2018 ◽  
Vol 11 (8) ◽  
pp. 1957 ◽  
Author(s):  
Xiaojing Zhang ◽  
Lu Ren ◽  
Haichuan Yu ◽  
Yang Xu ◽  
Qingquan Lei ◽  
...  
Keyword(s):  
High Temperature ◽  
Thermal Aging ◽  
Thermal Calculation ◽  
Insulation System ◽  
Dielectric Parameters ◽  
Distribution Transformers ◽  
Aging Test ◽  
Insulation Systems ◽  
Paper Insulation ◽  
Natural Ester

A high-temperature oil–paper insulation system offers an opportunity to improve the overloading capability of distribution transformers facing seasonal load variation. A high-temperature electrical insulation system (EIS) was chosen due to thermal calculation based on a typical loading curve on the China Southern Power Grid. In order to evaluate candidate high-temperature insulation systems, Nomex® T910 (aramid-enhanced cellulose) immersed in FR3 (natural ester) was investigated by a dual-temperature thermal aging test compared with a conventional insulation system, Kraft paper impregnated with mineral oil. Throughout the thermal aging test, mechanical, chemical, and dielectric parameters of both paper and insulating oil were investigated in each aging cycle. The thermal aging results determined that the thermal class of the FR3-T910 insulation system meets the request of overloading transformer needs.

High-Temperature Operation of Photonic-Crystal Lasers for On-Chip Optical Interconnection

2012 ◽  
Vol E95.C (7) ◽  
pp. 1244-1251 ◽  
Author(s):  
Koji TAKEDA ◽  
Tomonari SATO ◽  
Takaaki KAKITSUKA ◽  
Akihiko SHINYA ◽  
Kengo NOZAKI ◽  
...  
Keyword(s):  
High Temperature ◽  
Photonic Crystal ◽  
Optical Interconnection ◽  
On Chip ◽  
High Temperature Operation

KUBOTA UCX

Alloy Digest ◽  
2008 ◽  
Vol 57 (6) ◽  
Keyword(s):  
Corrosion Resistance ◽  
High Temperature ◽  
Physical Properties ◽  
Tensile Properties ◽  
Temperature Performance ◽  
High Temperature Operation ◽  
Oxidation And Corrosion ◽  
Very High

Abstract Kubota UCX was developed for very high temperature operation for ethylene pyrolysis service. The alloy also has excellent oxidation and corrosion resistance. This datasheet provides information on composition, physical properties, elasticity, and tensile properties. It also includes information on high temperature performance and corrosion resistance as well as casting and joining. Filing Code: Ni-663. Producer or source: Kubota Metal Corporation, Fahramet Division.

scholarly journals Identification of Existing Challenges and Future Trends for the Utilization of Ammonia-Water Absorption–Compression Heat Pumps at High Temperature Operation

2021 ◽  
Vol 11 (10) ◽  
pp. 4635
Author(s):  
Marcel Ulrich Ahrens ◽  
Maximilian Loth ◽  
Ignat Tolstorebrov ◽  
Armin Hafner ◽  
Stephan Kabelac ◽  
...  
Keyword(s):  
High Temperature ◽  
Water Absorption ◽  
Industrial Sector ◽  
Heat Pumps ◽  
Working Fluid ◽  
Large Temperature ◽  
Future Trends ◽  
Ammonia Water ◽  
Starting Point ◽  
High Temperature Operation

Decarbonization of the industrial sector is one of the most important keys to reducing global warming. Energy demands and associated emissions in the industrial sector are continuously increasing. The utilization of high temperature heat pumps (HTHPs) operating with natural fluids presents an environmentally friendly solution with great potential to increase energy efficiency and reduce emissions in industrial processes. Ammonia-water absorption–compression heat pumps (ACHPs) combine the technologies of an absorption and vapor compression heat pump using a zeotropic mixture of ammonia and water as working fluid. The given characteristics, such as the ability to achieve high sink temperatures with comparably large temperature lifts and high coefficient of performance (COP) make the ACHP interesting for utilization in various industrial high temperature applications. This work reviews the state of technology and identifies existing challenges based on conducted experimental investigations. In this context, 23 references with capacities ranging from 1.4 kW to 4500 kW are evaluated, achieving sink outlet temperatures from 45 °C to 115 °C and COPs from 1.4 to 11.3. Existing challenges are identified for the compressor concerning discharge temperature and lubrication, for the absorber and desorber design for operation and liquid–vapor mixing and distribution and the choice of solution pump. Recent developments and promising solutions are then highlighted and presented in a comprehensive overview. Finally, future trends for further studies are discussed. The purpose of this study is to serve as a starting point for further research by connecting theoretical approaches, possible solutions and experimental results as a resource for further developments of ammonia-water ACHP systems at high temperature operation.

High-Temperature Operation Method for Image Pickup Tube

2021 ◽  
pp. 1-1
Author(s):  
Yoichiro Neo ◽  
Masato Nakata ◽  
Yukino Kameda ◽  
Yoshinori Hatanaka ◽  
Hidenori Mimura
Keyword(s):  
High Temperature ◽  
Operation Method ◽  
High Temperature Operation

High-temperature operation of GaN-based OPAMP on silicon substrate

2010 ◽  
Vol 7 (7-8) ◽  
pp. 1952-1954 ◽  
Author(s):  
Kazuki Nomoto ◽  
Kazuya Hasegawa ◽  
Tohru Nakamura
Keyword(s):  
High Temperature ◽  
Silicon Substrate ◽  
High Temperature Operation

1.3 [micro sign]m InAsP/InAlGaAs MQW lasers for high-temperature operation

1997 ◽  
Vol 33 (12) ◽  
pp. 1048 ◽  
Author(s):  
T. Anan ◽  
M. Yamada ◽  
K. Tokutome ◽  
S. Sugou
Keyword(s):  
High Temperature ◽  
High Temperature Operation
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