Results 101 to 110 of about 3,902 (291)

Quantifying temporal dynamics of greenhouse gas emissions in lake mesocosms: Deployment of a low‐cost measurement system

Limnology and Oceanography: Methods, EarlyView.
Abstract Greenhouse gas (GHG) emissions from freshwater ecosystems contribute significantly to global carbon budgets, yet they remain poorly constrained due to limited high‐frequency measurements. We tested a low‐cost, high‐frequency GHG measurement system in a long‐term mesocosm experiment in Lemming, Denmark, over a 7‐month period, focusing on CO2 ...
Tuba Bucak, Eti Ester Levi, Claus Melvad, Jianming Deng, Mikhail Mastepanov, Robert Ladwig, Thomas Alexander Davidson   +6 more
wiley   +1 more source

Digital distance relay reliability enhancement using real-time filter

, 2011
In the conventional three - zone stepped directional distance scheme, distance relay is used to provide the primary as well as remote backup protection. However, the mal-operation of this relay under stressed conditions such as power swing and switching ...
Bentarzi, Hamid, Ouadi, Abderrahmane, Maun, Jean Claude   +2 more
core  

The comparison and analysis for loss of excitation protection schemes in generator protection

, 2012
Loss-Of-Excitation (LOE) condition of a generator may cause severe damages on both generator and the interconnected systems. This paper analyses the behaviours of different LOE protection schemes, such as R-X, G-B, P-Q and U-I schemes, for a hydro ...
C. Sao, Wang, J. P., Z.P. Shi, Ghandhari, Mehrdad,, Z. Gajic, Gajic, Z., J.P. Wang, M. Ghandhari, Sao, C., Shi, Z. P.   +9 more
core   +1 more source

The Evolution of Autonomous Systems for Planetary Cave Exploration: A Review

Journal of Field Robotics, EarlyView.
ABSTRACT The exploration of Subsurface Access Points (SAPs), such as lava tubes on the Moon and Mars, has gained significant interest due to their potential as stable environments shielded from surface radiation and temperature extremes. These sites are considered high‐value targets for detecting water and signs of ancient life, and assessing their ...
Sarah Swinton, Daniel Mitchell, Jamie Blanche, Euan McGookin, David Flynn   +4 more
wiley   +1 more source

Research on identification algorithm of oscillating current in DC incoming lines of metro

机车电传动
The paper presents a fault diagnosis and analysis algorithm centered on variational mode decomposition (VMD), sample entropy, and TOPSIS, to address the challenge of frequent misoperations of relay protection systems triggered by oscillating current in ...
WANG Nanqing, QI Yu, XIN Lanyuan, SONG Jinchuan, TIAN Xingjun   +4 more
doaj  

Analysis of relay protection action of grounding fault of no-load charging of a 330 kV transformer

Gong-kuang zidonghua, 2013
In view of problem that a 330 kV start-up standby transformer took place relay protection action in no-load charging, the paper indicated that the action was caused by grounding fault of A-phase current transformer through analyzing charging current ...
LYU Bin, NI Sai-sai, LIU Yang, ZHONG Li-na   +3 more
doaj  

Digital distance relay reliability enhancement using real-time filter

, 2010
In the conventional three - zone stepped directional distance scheme, distance relay is used to provide the primary as well as remote backup protection. However, the mal-operation of this relay under stressed conditions such as power swing and switching ...
Bentarzi, Hamid, Ouadi, Abderrahmane, Maun, Jean Claude   +2 more
core  

IEC61850 standard-based harmonic blocking scheme for power transformers

, 2019
Transformer Differential and overcurrent schemes are traditionally used as main and backup protection respectively. The differential protection relay (SEL487E) has dedicated harmonic restraint function which blocks the relay tripping during the ...
Krishnamurthy, Senthil, Baningobera, Bwandakassy Elenga   +1 more
core   +1 more source

Tracing Three Decades of Low Earth Orbit Satellite Communication Development: A Bibliometric and Main Path Analysis of Network Architectures, Protocol Evolution, and Emerging Intelligent Services

International Journal of Satellite Communications and Networking, EarlyView.
ABSTRACT Low Earth Orbit (LEO) satellite communication systems have evolved into a critical component of global broadband networks, enabling wide‐area connectivity, IoT services, and intelligent multilayer satellite–terrestrial integration. Despite rapid advancements in constellation deployment, routing mechanisms, resource management, and LEO–5G/6G ...
Wei‐Hao Su, Ya‐Chen Chuang, Long‐Sheng Chen   +2 more
wiley   +1 more source

Advanced Microgrid Protection Utilizing Zero Sequence Components With Hard-Ware-in-the-Loop Testing

IEEE Access
Microgrid protection and ground fault management are critical aspects of modern power distribution systems, especially with the increasing integration of Distributed Generators (DGs) such as renewable energy sources.
Zahra Ghanem, Feras Alasali, Naser El-Naily, Hassen Loukil, Haytham Y. Mustafa, Saad M. Saad, Abdelaziz Salah Saidi, William Holderbaum   +7 more
doaj   +1 more source