Results 11 to 20 of about 377 (115)

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

Analysis Oil Condition of Transformer PT-8801-A by Using the Method TDCG, Rogers Ratio, Key Gas, and Duval Triangle: A Case Study at PT. Perta Arun Gas

Journal of Renewable Energy, Electrical, and Computer Engineering, 2022
The power transformer would have happened disturbanced that can cause a failure at a transformer. For this condition needed to maintenance power transformer, one of which is by analyzing transformer oil by using the TDCG method. This analysis is carried out to determine the diagnosis of faults in the transformer.
Rastra Furqaranda, Andik Bintoro, Asri Asri, Waleed Khalid Ahmed Al-Ani, Ashish Shrestha   +4 more
openaire   +1 more source

Investigation on gas generation characteristics in transformer oil under vibration

IET Generation, Transmission & Distribution, 2022
Operating experience has shown that characteristic gases can be found in oil‐immersed power transformers and high‐voltage reactors under strong vibration without discharge or thermal faults occurring.
Chong Guo, Qiaogen Zhang, Rui Zhang, Xiaohui He, Zhicheng Wu, Tao Wen   +5 more
doaj   +1 more source

Adaptive Dynamic Meta-Heuristics for Feature Selection and Classification in Diagnostic Accuracy of Transformer Faults

IEEE Access, 2021
Detection of transformer faults avoids the transformer’s undesirable loss from service and ensures utility service continuity. Diagnosis of transformer faults is determined using dissolved gas analysis (DGA).
Sherif S. M. Ghoneim, Tamer Ahmed Farrag, A. Ali Rashed, El-Sayed M. El-Kenawy, Abdelhameed Ibrahim   +4 more
doaj   +1 more source

Stratifying transformer defects through modelling and simulation of thermal decomposition of insulating mineral oil

Automatika, 2023
The current work aims to propose an adequate thermodynamic model, in addition to proposing and evaluating two composite models for the thermal decomposition of insulating mineral oil (IMO), considering that the models based on classical diagnostic ...
A. Manjula, Sangeetha S, Mustafa Musa Jaber, Hamad Mohamad A.A, Santosh Kumar Sahu, Rajesh Verma, Prashant Vats   +6 more
doaj   +1 more source

Fault diagnosis of transformer using artificial intelligence: A review

Frontiers in Energy Research, 2022
Transformer is one of the important components of the power system, capable of transmitting and distributing the electricity generated by renewable energy sources.
Yan Zhang, Yufeng Tang, Yongqiang Liu, Zhaowen Liang   +3 more
doaj   +1 more source

Diagnosing the type and location of the transformer fault by analyzing the dissolved gas using fuzzy logic [PDF]

هوش محاسباتی در مهندسی برق
There are many methods to diagnose transformer faults, including dissolved gas analysis (DGA), done in two conventional and smart ways. This paper presents a new method based on fuzzy logic and 5 DGA methods (key gas method, Durenberg's ratio method ...
Mohamad Beiranvand, Asghar Akbari Froud
doaj   +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