Results 1 to 10 of about 351,030 (147)

Current transformer (CT) saturation classification using empirical mode decomposition (EMD) and relevance vector machine (RVM) [PDF]

Scientific Reports
The fault is taking place in the power system where the saturation of the Current Transformer (CT) is occurring, among other variations of system parameters.
Nilesh Chothani, Parth Vyas, Chandrakant Sonawane, Choon Kit Chan   +3 more
doaj   +2 more sources

The study on the Mal-operation of the transformer current differential protection during external faults cause by CT saturation [PDF]

E3S Web of Conferences, 2021
This paper analyses the unusual mal-operation of the differential protection for transformer current differential protection during the external fault. The mal-operation reason is researched in detail, based on the mathematical analysis, the simulation ...
Wu Jianhong, Qi Xuanwei, Song Wang, Cao Wenbin, He Jun, Mao Lan   +5 more
doaj   +1 more source

Adaptive differential current relay based on form/ripple factors for busbar current signals [PDF]

Scientific Reports
This paper presents an adaptive protection algorithm that adjusts the tripping characteristics of the differential relaying schemes in response to changes in CT saturation levels and DC component content of fault currents.
R. A. Mahmoud
doaj   +2 more sources

Magnetic Flux Density Feature Analysis and CT Saturation Region Recognition and Reconstruction Technology

Zhongguo dianli, 2023
To solve the problem of relay protection caused by CT saturation, a CT saturation identification method is proposed based on flux density characteristics and secondary current reconstruction technology in the distortion area.
Feng WANG, Jia ZHU, Shaolin JIAO, Yiquan LI, Hua XIE, Qingchun ZHAO   +5 more
doaj   +1 more source

Fast Detection of Current Transformer Saturation Using Stacked Denoising Autoencoders

Energies, 2023
Malfunctions in relay protection devices are predominantly caused by current transformer (CT) saturation which produces distortion in current measurements and disturbances in power system protection.
Sopheap Key, Chang-Sung Ko, Kwang-Jae Song, Soon-Ryul Nam   +3 more
doaj   +1 more source

Substation protection method for missing measurement information of transformer and bus connecting line [PDF]

E3S Web of Conferences, 2021
In order to solve the problems of protection misoperation and refusing to operate caused by the lack of measurement information in smart substation, a substation protection method which can effectively eliminate the influence of transformer inrush ...
Liu Wei, Wang Yuxue, Wang Zengchao, Xu Zhile, Li Yiquan, Deng Xuyang, Liu Shidan, Liu Kun, Wen Minghao   +8 more
doaj   +1 more source

Data-Driven Three-Phase Saturation Identification from X-ray CT Images with Critical Gas Hydrate Saturation

Energies, 2020
This study proposes three-phase saturation identification using X-ray computerized tomography (CT) images of gas hydrate (GH) experiments considering critical GH saturation (SGH,C) based on the machine-learning method of random forest.
Sungil Kim, Kyungbook Lee, Minhui Lee, Taewoong Ahn   +3 more
doaj   +1 more source

Correlation between chest CT severity scoring system with oxygen saturation and laboratory inflammatory markers in adult patients with COVID-19 infection

The Egyptian Journal of Radiology and Nuclear Medicine, 2022
Background COVID-19 pneumonia is responsible for the latest pandemics. Chest computed tomography (CT) scan is known to be an essential tool for diagnosis of COVID-19.
Ahmed Gamil Ibrahim Abd El Megid, Mohamed El Shabrawy, Ahmed Abd El-Hamid Mohamed Abdalla   +2 more
doaj   +1 more source

Clinical and radiological imaging as prognostic predictors in COVID-19 patients

The Egyptian Journal of Radiology and Nuclear Medicine, 2021
Background Since the announcement of COVID-19 as a pandemic infection, several studies have been performed to discuss the clinical picture, laboratory finding, and imaging features of this disease.
Maha Ibrahim Metwally, Mohammad Abd Alkhalik Basha, Mohamed M. A. Zaitoun, Housseini Mohamed Abdalla, Hanaa Abu Elazayem Nofal, Hamdy Hendawy, Esaraa Manajrah, Reham farid Hijazy, Loujain Akbazli, Ahmed Negida, Walid Mosallam   +10 more
doaj   +1 more source

Waveform dissimilarity factor-based protection for main transformers in wind farms

Energy Reports, 2023
Current differential protection (CDP) is widely used as main protection for transformers due to its high reliability and selectivity. Owing to non-fundamental frequency current, magnetizing inrush and current transformer (CT) saturation, CDP may undergo ...
Yingyu Liang, Yaqin Wang, Zhi Zhang, Feng Zhao   +3 more
doaj   +1 more source