Results 41 to 50 of about 10,677,552 (246)

Discriminating transformer large inrush currents from fault currents

International Journal of Electrical Power & Energy Systems, 2016
Abstract One of the most widely used approaches for transformer protection is the low impedance differential relay, which can be adversely affected by inrush currents. Although the conventional inrush current detectors, i.e. the gap detection and second harmonic criteria, can block the differential relay in most of such cases, they are severely prone
Hamed Dashti, Mahdi Davarpanah, Majid Sanaye-Pasand, Hamid Lesani   +3 more
openaire   +1 more source

Commutation failure suppression strategy of hybrid DC transmission based on active current limiting

电力工程技术, 2022
Aiming at the problem of large inrush current when the commutation fails in the hybrid direct current (DC) transmission system,the relationship between the inrush current amplitude and the voltage source converter (VSC) is firstly derived.
MA Wenzhong, LI Zhaoyuan, ZHANG Kuitong, HAN Jia, LI Mushu, YAO Minrui   +5 more
doaj   +1 more source

Electronic suppression of transformer inrush currents

International Journal of Electrical Power & Energy Systems, 1988
Abstract A novel electronic technique for suppressing transformer inrush currents is outlined. The suppression concept is based on the generation of a time-expanding triggering signal controlling an electronic switch which is connected to the primary winding of the transformer.
El-Hosseiny T. El Shirbeeny, A.Y. Yakka
openaire   +1 more source

Analysis and suppression of operational overvoltage and inrush current for high‐speed trains by automatic phase‐switching technique

High Voltage
When a high‐speed train approaches the insulated phase‐splitting section embedded between neighbouring power supply arms, the vacuum circuit breaker (VCB) installed on trains must be disconnected to maintain the traction power supply system as a no‐load ...
Ye Cao, S. Xiao, Zhizong Ye, Guangning Wu, Yujun Guo, Guoqiang Gao, Chuanming Sun, Jiancheng Liu, Zheng Chen, Hao Hou, Zijing Wang, Puyang Liu, Yuhui Zhang, Jie Yu   +13 more
semanticscholar   +1 more source

Application of saturated core transformer as inrush current limiter

e-Prime: Advances in Electrical Engineering, Electronics and Energy
An inrush current is a transient current that results from a sudden change in the exciting voltage across a transformer's windings. Reducing the inrush current of transformers is desirable due to mechanical stresses and negligent operation of protective ...
Mehrdad Tarafdar-Hagh, Noorallah Hasanlouei, Kashem Muttaqi, Kamran Taghizad-Tavana, Sayyad Nojavan, Meysam Abdi   +5 more
doaj   +1 more source

A pre-charging strategy based on composite frequency control for a modular multilevel DC transformer

Energy Reports, 2022
Modular multilevel DC transformers(MMDCTs) have become a research focus in DC grids with different voltage levels based on their advantages of strong expansibility and high voltage levels.
Zhendong Ji, Jintao Zhang, Dongye Li, Yichao Sun, Jianhua Wang, Jianfeng Zhao   +5 more
doaj   +1 more source

A piezoelectrically actuated ball valve [PDF]

, 1972
Bimorph strip composed of two layers of poled piezoelectric ceramic material closes and opens valve. Strip performs like capacitator, allowing initial inrush of current when valve is energized and then only small leakage current flows as valve remains ...
Erwin, L. R., Schwartz, H. W., Teitelbaum, B. R.   +2 more
core   +1 more source

An FPGA Architecture and CAD Flow Supporting Dynamically Controlled Power Gating [PDF]

, 2014
© 2015 IEEE.Leakage power is an important component of the total power consumption in field-programmable gate arrays (FPGAs) built using 90-nm and smaller technology nodes. Power gating was shown to be effective at reducing the leakage power.
Bsoul, AAM, Luk, W, Tsoi, KH, Wilton, SJE   +3 more
core   +1 more source

Mitigating the Inrush Current of V/V Transformers Using Railway Conditioners

IEEE Access
Inrush current is high-magnitude current drawn by power transformers upon energization. The severity of inrush current depends on factors such as the transformer’s residual flux and the voltage phase angle at the energization instant. This paper proposes
A. Aghazadeh, E. Hajipour, Kang Li, S. Azizi   +3 more
semanticscholar   +1 more source

Data‐driven analysis of the spatial dependence of grouting efficiency during tunnel excavation

Deep Underground Science and Engineering, EarlyView.
Prediction of grouting efficiency using machine learning is enhanced by adopting a training strategy that accounts for the grouting process across multiple rounds. Abstract Grouting with water–cement mixtures is the most widely used and cost‐effective method for managing excess water inflow during tunnel construction.
Huaxin Liu, Xunchang Fei, Wei Wu
wiley   +1 more source