Results 11 to 20 of about 11,996,404 (122)

World War I photograph by duVal Allen, 1917-1919

, 1917
Photograph from duVal Allen's service as an ambulance driver during World War I, approximately 1917-1919.duVal Allen was a member of the Norwich University Class of 1919; he left school to serve as a volunteer ambulance driver in World War I.
Allen, duVal, 1896-1981
core   +35 more sources

Diagnosis of OLTC via Duval Triangle Method and Dynamic Current Measurement [PDF]

Procedia Engineering, 2013
Power transformers studies have shown that the main cause of power transformers failures is the On Load Tap Changer (OLTC). OLTC failure occurs due to the insulation degradation and contacts failure inside it.
Sutan Chairul, Imran, Ahmad Khiar, Mohd Shahril, Ab Ghani, Sharin, Md Thayoob, Yasmin Hanum, Yang Ghazali, Young Zaidey, Ghazali Y.Z.Y., Ghani S.A., Khiar M.S.A., Thayoob Y.H.M., Chairul I.S.   +9 more
core   +3 more sources

Bayesian Duval Triangle Method for Fault Prediction and Assessment of Oil Immersed Transformers [PDF]

Measurement + Control, 2017
Dissolved gas analysis of transformer insulating oil is considered the best indicator of a transformer’s overall condition and is most widely used. In this study, a Bayesian network was developed to predict failures of electrical transformers.
Abdelaziz Lakehal, Fouad Tachi
doaj   +2 more sources

A Thirty‐Year Gap: Reviving All‐Nitride Glasses as Processable, High‐Performance Materials [PDF]

Advanced Science, Volume 13, Issue 58, 19 October 2026.
Oxygen‐free all‐nitride glasses are revisited in light of new avenues of synthesis, raw material availability, and applications. A semi‐empirical analysis predicts mechanical performance achieving the level of engineering ceramics while maintaining visual transparency, and significant potential regarding optical properties into the infrared spectral ...
Alexis Duval, Tor Grande, Lothar Wondraczek   +2 more
wiley   +2 more sources

Machine learning based multi-method interpretation to enhance dissolved gas analysis for power transformer fault diagnosis [PDF]

Heliyon
Accurate interpretation of dissolved gas analysis (DGA) measurements for power transformers is essential to ensure overall power system reliability. Various DGA interpretation techniques have been proposed in the literature, including the Doernenburg ...
Suwarno, Heri Sutikno, Rahman Azis Prasojo, Ahmed Abu-Siada   +3 more
doaj   +2 more sources

Transformer fault diagnose intelligent system based on DGA methods [PDF]

Scientific Reports
Power transformers have great importance in power system networks. Any malfunctions in the power transformers cause a system disconnection, which leads to lost profits for the electricity utilities.
Saad A. Mohamed Abdelwahab, Ibrahim B. M. Taha, Rizk Fahim, Sherif S. M. Ghoneim   +3 more
doaj   +2 more sources

Effective Behavior Change Techniques for Successful Weight Loss and Weight Loss Maintenance Among Adults With Overweight and Obesity: A Systematic Review and Meta‐Analysis [PDF]

Obesity Reviews, Volume 27, Issue 9, September 2026.
ABSTRACT Achieving and maintaining weight loss are challenging and require sustained lifestyle changes. This study examined which behavior change techniques (BCTs) support long‐term weight outcomes among adults with overweight or obesity. We synthesized evidence from randomized controlled trials of behavioral interventions versus control or alternative
Katharina Preuhs, Iris Eekhout, Rosa Andree, Hilde van Keulen, Pepijn van Empelen   +4 more
wiley   +2 more sources

Performance Assessment of IEEE/IEC Method and Duval Triangle technique for Transformer Incipient Fault Diagnosis

IOP Conference Series: Materials Science and Engineering, 2022
Abstract Power transformers are among the most important equipment in a power system. The assessment of the transformer’s condition which is connected to a system is needed to avoid disastrous failures and the subsequent power outages.
null Manisha, Kulraj Kaur, Naveen Kumar Sharma, Jashandeep Singh, Deepika Bhalla   +4 more
openaire   +1 more source

DISSOLVED GAS ANALYSIS MINYAK ISOLASI TRANSFORMATOR 11KV/150 KV DI ULPL-TA MUSI DENGAN METODE DUVAL TRIANGLE DAN METODE DUVAL PENTAGON

, 2023
Minyak isolasi merupakan bagian terpenting sebuah transformator yang fungsinya sebagai isolator dan sebagai pendingin. Pada penelitian ini dilakukan analisis minyak isolasi transformator atau analisis gas terlarut (DGA) dengan menggunakan alat ...
Ika, Novia Anggraini, VANKI, ANGGARA PUTRA, Yuli, Rodiah   +2 more
core   +2 more sources

Using the Analysis of the Gases Dissolved in Oil in Diagnosis of Transformer Bushings with Paper-Oil Insulation—A Case Study

Energies, 2020
The article describes a case study when the voltage collapse during lightning impulse tests of new power transformers was noticed and when the repeated tests finished with a positive result.
Tomasz Piotrowski, Pawel Rozga, Ryszard Kozak, Zbigniew Szymanski   +3 more
doaj   +1 more source