Results 101 to 110 of about 23,991 (249)

Dynamic Behaviour of Bubbles in Oil Under Electrothermal Ageing

High Voltage, EarlyView.
ABSTRACT During long‐term operation of converter transformers, the internal oil–pressboard insulation undergoes irreversible degradation. Partial discharge in the weakened insulation will cause the formation of a large number of bubbles in the insulating oil.
Hongbin Wu, Zhaoyang Kang, Ze Li, Zhongyu Zhao, Shuqi Li, Fuqiang Ren, Hongshun Liu, Qingquan Li   +7 more
wiley   +1 more source

Lightning breakdown voltages of refined bleached and deodorised palm oil under needle-plane configuration [PDF]

, 2017
In recent years, vegetable oil such as Palm Oil (PO) has been identified as a potential alternative dielectric insulating fluid for transformers. It is biodegradable, non-toxic and has high flash and fire points.
Azis, Norhafiz, Thien, Yee Von, Yaakub, Zaini, Yunus, Robiah   +3 more
core  

Study of the plasma flow interaction with the borehole surface in the process of its thermal reaming [PDF]

, 2018
Purpose. Study of the plasma flow interaction with the borehole surface in the process of its thermal reaming for determination of transient temperature distribution along the borehole surface and the average coefficient of heat transfer from the plasma ...
Horiachkin, V, Potapchuk, I, Semenenko, Ye, Voloshyn, O, Yemelianenko, V, Zhevzhyk, O, Zhovtonoha, M, Таtarko, L   +7 more
core   +1 more source

Study on Impurity Particle Detection in Transformer Oil Based on Microflow Imaging Method

High Voltage, EarlyView.
ABSTRACT The concentration of particles in transformer oil has a significant influence on its electrical performance, making oil cleanliness a critical parameter in the operation and maintenance of power transformers. However, the light obstruction (LO) method recommended by current standards has inherent limitations, including low sensitivity to ...
Chen Chen, Lijun Yang, Wu Zhao, Zhengyu Chen, Xinxi Yu, Yong Li, Ruijin Liao   +6 more
wiley   +1 more source

Lightning Impulse Withstand of Natural Ester Liquid

Energies, 2018
Due to the low biodegradability of mineral oil, intense research is conducted to define alternative liquids with comparable dielectric properties. Natural ester liquids are an alternative in focus; they are used increasingly as insulating liquid in ...
Stephanie Haegele, Farzaneh Vahidi, Stefan Tenbohlen, Kevin J. Rapp, Alan Sbravati   +4 more
doaj   +1 more source

Deterioration Law of Mechanical Properties of Insulation Pressboard Under Multifield Coupled Ageing

High Voltage, EarlyView.
ABSTRACT Converter transformers can experience progressive deterioration of their oil–pressboard insulation under elevated temperature, combined AC–DC electrical stress and persistent mechanical vibration. This study investigates how mechanical vibration affects the mechanical properties of insulation pressboard and clarifies the associated microscopic
Jiayi Chen, Guan Wang, Zihao Li, Zhongyu Zhao, Kuo Yan, Hongshun Liu   +5 more
wiley   +1 more source

Hubungan burnout dengan kepuasan kerja dalam kalangan guru-guru Kemahiran Hidup Bersepadu (KHB) sekolah menengah di Daerah Batu Pahat [PDF]

, 2006
Tugas guru tidak terbatas kepada mendidik, tetapi juga dibebani dengan tugas-tugas sampingan yang boleh mendatangkan stres. Stres negatif yang berlarutan akan mendatangkan burnout di mana guru-guru akan mengalami ketandusan emosi, depersonalisasi dan ...
Ishak, Rohaidah
core   +1 more source

Mineral Oil‐Induced Ageing Characteristics of Aluminium Nitride‐Doped Silicone Rubber Nanocomposites

High Voltage, EarlyView.
ABSTRACT Room temperature vulcanised (RTV) silicone rubber, commonly used as an external insulating coating on ceramic bushings of oil‐immersed transformers, undergoes significant degradation when exposed to mineral oil under harsh environmental conditions.
Dhanunjaya Naidu Vangapandu, Palash Mishra, Pawel Rozga, R. Sarathi, Mithun Mondal, M. Tariq Nazir, Chillu Naresh   +6 more
wiley   +1 more source

Inflation Propagation in Production

Australian Economic Review, EarlyView.
ABSTRACT Background Inflationary pressures in an increasingly interconnected production system reflect not only aggregate or isolated sectoral shocks but also their propagation through supply‐chain networks. Methods This paper examines the mechanisms underlying inflation transmission in a small open economy, using industry‐level data for Australian ...
Thuy Hang Duong
wiley   +1 more source

Effect of different contents of nano-SiO2 particles on water diffusion behavior in insulating oil

AIP Advances, 2019
As an important component of the internal insulation system in a transformer, insulating oil will gradually age during the long-term operation of the transformer, which will lead to a degradation of its insulation performance.
Qian Wang, Shiling Zhang, Wenxin Tian, Xiong Liu, Dongyuan Du, Chao Tang   +5 more
doaj   +1 more source