Results 11 to 20 of about 7,492 (146)

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

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

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   +3 more sources

How effective are entomopathogenic nematodes for vine weevil (Coleoptera: Curculionidae) biological control? A meta-analysis. [PDF]

Pest Manag Sci
Entomopathogenic nematodes provide reliable biological control of vine weevil larvae, reducing populations by 63% on average. All five tested species are effective, with temperature (18–30 °C) being the strongest predictor of success. Abstract BACKGROUND Vine weevil (Otiorhynchus sulcatus) is a globally important pest of soft fruit and ornamental crops
Roberts JM, Corradi M, Clunie BJ, Fezza E, Harris WE, Pope TW.   +5 more
europepmc   +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

Modification of Duval Triangle for Diagnostic Transformer Fault through a Procedure of Dissolved Gases Analysis

Transactions on Environment and Electrical Engineering, 2016
Dissolved gas-in-oil analysis (DGA) is a sensitive and reliable technique for the detection of incipient fault condition within oil-immersed transformers. When the mineral oil is subjected to high thermal or/and electrical stresses, it decomposes and, as
Sobhy Serry Dessouky, Ahmed E. Kalas, Ramadan Aly Ahmed, Abdel Moneim M. Hassan   +3 more
doaj   +3 more sources

Analysis of Transformer Conditions using Triangle Duval Method

IOP Conference Series: Materials Science and Engineering, 2018
Abstract Electrical or thermal failure that occurred in the transformer oil can produce a dangerous gas called gas fault. By indicating the content of dissolved gases in the transformer oil, can be obtained information about what happened to the oil so it can be estimated indication of the type and cause of the failure in the transformer.
S Permana, S Sumarto, W S Saputra
openaire   +3 more sources

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   +3 more sources

Reduced Offspring Viability Is Associated With Long-Term Stability of a Narrow Avian Hybrid Zone. [PDF]

Ecol Evol
We investigated hybrid viability in a tropical, avian hybrid zone governed by strong selection on male secondary sexual traits between the white‐collared manakin (Manacus candei) and golden‐collared manakin (M. vitellinus). We assessed putative hybrid fitness by investigating adult survival and hatching success along with a prospective selective ...
Long KM, Braun MJ, Muñoz Abrego A, Jaramillo O, Jones TM, Brawn JD.   +5 more
europepmc   +2 more sources

Dissolved Gas Analysis of Generator Step Up Transformer in Grati Power Plant Using Random Forest Based Method

Jurnal Jaringan Telekomunikasi, 2023
Transformers are one of the important electrical equipment in the power system. To prevent some electrical contact on the component in transformers, an insulator or dielectric material is needed likely insulating oil.
Muhammad Akmal Afibuddin Putra, Rahman Azis Prasojo, Anang Dasa Novfowan, Neelmani Neelmani   +3 more
doaj   +1 more source