Results 21 to 30 of about 7,461 (155)

Diagnosis of OLTC via Duval Triangle Method and Dynamic Current Measurement

Procedia Engineering, 2013
AbstractPower 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. Other than that, contacts wear influences the OLTC performance and this phenomenon has not been deeply investigated.
Khiar, Mohd Shahril Ahmad, Thayoob, Yasmin Hanum Md, Ghazali, Young Zaidey Yang, Ghani, Sharin Ab, Chairul, Imran Sutan   +4 more
openaire   +1 more source

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

Enhancing Diagnostic Accuracy of Transformer Faults Using Teaching-Learning-Based Optimization

IEEE Access, 2021
The early detection of the transformer faults with high accuracy rates guarantees the continuous operation of the power system networks. Dissolved gas analysis (DGA) is a technique that is used to detect or diagnose the transformer faults based on the ...
Sherif S. M. Ghoneim, Karar Mahmoud, Matti Lehtonen, Mohamed M. F. Darwish   +3 more
doaj   +1 more source

Reliable Estimation for Health Index of Transformer Oil Based on Novel Combined Predictive Maintenance Techniques

IEEE Access, 2022
Transformer oil insulation condition may be deteriorated due to electrical and thermal faults, which may lead to transformer failure and system outage. In this regard, the first part of this paper presents comprehensive maintenance for power transformers
Mohamed Badawi, Shimaa A. Ibrahim, Diaa-Eldin A. Mansour, Adel A. El-Faraskoury, Sayed A. Ward, Karar Mahmoud, Matti Lehtonen, Mohamed M. F. Darwish   +7 more
doaj   +1 more source

Analisis Kualitas Minyak Trafo Menggunakan Data Dissolved Gas Analysis dan Water Content

Protek: Jurnal Ilmiah Teknik Elektro, 2018
Transformer is a vital equipment in the power system. If the transformer is damage, can cause the electrical distribution to the consumer will be disrupted. Therefore, it needs special maintenance the performance of the transformer to avoid damage.
Abdul Syakur, Fanny Rizka Savitri
doaj   +1 more source

Combining Contrast Invariant L1 Data Fidelities with Nonlinear Spectral Image Decomposition [PDF]

, 2017
This paper focuses on multi-scale approaches for variational methods and corresponding gradient flows. Recently, for convex regularization functionals such as total variation, new theory and algorithms for nonlinear eigenvalue problems via nonlinear ...
A Chambolle, A Haddad, A Hoover, C Brune, C Wu, C Zach, D Strong, G Bellettini, G Gilboa, G Gilboa, G Gilboa, J Yuan, JF Aujol, L Zeune, M Burger, M Burger, M Nikolova, S Osher, TF Chan, V Caselles, V Duval, W Yin, Y Dong   +22 more
core   +3 more sources

Fuzzy Logic Approach to Dissolved Gas Analysis for Power Transformer Failure Index and Fault Identification

Energies, 2020
This research focuses on problem identification due to faults in power transformers during operation by using dissolved gas analysis such as key gas, IEC ratio, Duval triangle techniques, and fuzzy logic approaches.
Nitchamon Poonnoy, Cattareeya Suwanasri, Thanapong Suwanasri   +2 more
doaj   +1 more source

The Efficacy of Experiential Dynamic Therapies: A 10-Year Systematic Review and Meta-Analysis Update. [PDF]

Clin Psychol Psychother
ABSTRACT There is a growing interest in clinical interventions targeting emotion regulation difficulties across mental health conditions. Experiential dynamic therapies (EDTs) are transdiagnostic, affect‐focused, short‐term psychodynamic therapy models that emphasize in‐session emotional processing. This review provides a 10‐year update on the efficacy
Lilliengren P, Mechler J, Lindqvist K, Maroti D, Johansson R.   +4 more
europepmc   +2 more sources

The origin of physical variations in the star formation law [PDF]

, 2013
Observations of external galaxies and of local star-forming clouds in the Milky Way have suggested a variety of star formation laws, i.e., simple direct relations between the column density of star formation (Sigma_SFR: the amount of gas forming stars ...
Federrath, Christoph
core   +1 more source

Comparison of Dissolved Gases in Mineral and Vegetable Insulating Oils under Typical Electrical and Thermal Faults

Energies, 2016
Dissolved gas analysis (DGA) is attracting greater and greater interest from researchers as a fault diagnostic tool for power transformers filled with vegetable insulating oils.
Chenmeng Xiang, Quan Zhou, Jian Li, Qingdan Huang, Haoyong Song, Zhaotao Zhang   +5 more
doaj   +1 more source