Results 231 to 240 of about 1,916 (295)

Experimental performance examination of a coherence technique-based numerical differential current relay for AC machine stator windings protection. [PDF]

Sci Rep
Mahmoud RA.
europepmc   +1 more source

Investigation of the Simplified Equivalent Circuit Model of the Post‐Arc Sheath Stage in DC Vacuum Circuit Breakers

High Voltage, EarlyView.
ABSTRACT This paper presents a simplified equivalent circuit model (ECM) for the post‐arc sheath stage in DC vacuum circuit breakers and outlines the method for calculating circuit parameters using the particle‐in‐cell Monte Carlo collision (PIC‐MCC) method. The post‐arc sheath is modelled as a parallel combination of a variable resistor and a variable
Xubin Li, Xingyu Guo, Wen Wang, Xiaoming Liu, Minfu Liao, Jiyan Zou   +5 more
wiley   +1 more source

Vertical Shaft Drilling Rig Frequency Conversion Electronic Control Design and Its Energy Saving and Noise Reduction Effect Analysis. [PDF]

ACS Omega
Tian G, Ding Z, Liu B, Shang Z, Zhao K, Jiang X.   +5 more
europepmc   +1 more source

Surface Micro‐Discharge Plasma for Multiple Teeth Bleaching: Efficacy, Mechanism and Safety

High Voltage, EarlyView.
ABSTRACT Hydrogen peroxide (H2O2) is the commonly‐used bleaching chemical in clinical practice, but its excessive concentrations can cause tooth damage. Atmospheric pressure cold plasma is considered a promising new technique for tooth bleaching. Surface micro‐discharge (SMD) devices can generate large‐scale plasma, which holds potential for treating ...
Ruike Chen, Haoran Feng, Yinglong Li, Hong Pan, Hangbo Xu, Zhen Jiao, Dongjie Cui, Ruonan Ma   +7 more
wiley   +1 more source

Design and Characterization of a Self-Oscillating Fluxgate-Based Current Sensor for DC Distribution System Applications. [PDF]

Sensors (Basel)
Chen W, Chen H, Xu H, Li L.
europepmc   +1 more source

Post‐Arc Transient Dielectric Recovery Characteristics of Vacuum Interrupter in the Large‐Capacity Generator Circuit Breaker

High Voltage, EarlyView.
ABSTRACT Large‐capacity generator circuit breaker (GCB) based on vacuum interrupter technology is the key power equipment to ensure the safe operation of the power system. When the short‐circuit current was forced to cross zero, the large‐capacity GCB was difficult to generate a zero‐voltage environment through freewheeling, the vacuum interrupter (VI)
Xiangyu Han, Fei Yang, Yili Chen, Yunqi Wang, Chenle Zhai, Xuliang Zhao, Zhaowei Diao, Yi Wu, Mingzhe Rong   +8 more
wiley   +1 more source

Adaptive non unit traveling wave protection algorithm for multi terminal HVDC grids. [PDF]

Sci Rep
Raza A, Hamza MA, Kashif AR, Yousaf MZ, Khan B, Guerrero JM, Sivanraju R.   +6 more
europepmc   +1 more source

Arc Resistance Enhancement of Converter Transformer Tank Through Structural Improvements: Simulation and Experimental Validation

High Voltage, EarlyView.
ABSTRACT Currently, limited research exists on the structural response and protection methods of the converter transformer tank for ± 800 kV ultra‐high voltage direct current transmission project to high energy arc faults. This research investigates the dynamic response and the vulnerable areas of the ultra‐high voltage converter transformer under the ...
Ke Wang, Shuqi Zhang, Yikun Zhao, Yichen Wang, Zongliang Zhang, Jinhua Zhang   +5 more
wiley   +1 more source

New multi-injection commutation topology for circuit breakers of HVDC transmission lines. [PDF]

Sci Rep
Wadie F, Elsisi M, Eliyan T.
europepmc   +1 more source

Dynamic Behaviour of Bubbles in Oil Under Electrothermal Ageing

High Voltage, EarlyView.
ABSTRACT During long‐term operation of converter transformers, the internal oil–pressboard insulation undergoes irreversible degradation. Partial discharge in the weakened insulation will cause the formation of a large number of bubbles in the insulating oil.
Hongbin Wu, Zhaoyang Kang, Ze Li, Zhongyu Zhao, Shuqi Li, Fuqiang Ren, Hongshun Liu, Qingquan Li   +7 more
wiley   +1 more source