Results 31 to 40 of about 297 (183)

Overvoltage Simulation Analysis and Suppression of Breaking in a 35 kV Shunt Reactor

Energies
When a 35 kV distribution network has the problem of insufficient reactive power, the input of a shunt reactor is a common compensation method. Vacuum circuit breakers are widely used in 35 kV distribution networks because of their superior arc ...
Jing Chen, Xiaoyue Chen, Siying Feng, Xinmeng Liu, Qin Liu   +4 more
doaj   +1 more source

Experimental investigations on the post-arc current of the vacuum circuit breaker in an active mechanical DC circuit breaker

AIP Advances, 2021
Vacuum circuit breakers (VCB) are commonly used in active mechanical direct current circuit breakers (DC CBs) to accomplish the interruption of the fault current.
Shenli Jia, Qiang Tang, Zongqian Shi, Yongpeng Mo   +3 more
doaj   +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

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

Comparison of Dielectric Recovery After Arc Burning in SF6 Gas and Its Potential Alternatives

High Voltage, EarlyView.
ABSTRACT Although sulphur hexafluoride (SF6) exhibits exceptional insulating properties, it is a potent greenhouse gas. Therefore, studying alternatives to SF6 is critical for developing environmentally friendly high‐voltage electrical equipment.
Ziqi Liu, Hao Sun, Yi Wu, Mingzhe Rong, Zeyuan Luo   +4 more
wiley   +1 more source

Comprehensive review of permanent magnet actuator for high and medium voltage circuit breakers application: Design, optimization and control

Results in Engineering
Permanent magnet actuators are widely used in fields requiring precise and reliable motion control, such as valves, pumps, and switches. They have also been extensively applied in vacuum circuit breakers, particularly in high- and medium-voltage ...
Guanbao Zeng, Lijian Wu, Tao Wang, Dianhe Zhao   +3 more
doaj   +1 more source

The Impact of Various Contact Structures on the Microscopic Surface Condition of Vacuum Interrupters During Capacitive Switching

High Voltage, EarlyView.
ABSTRACT The double‐break vacuum circuit breakers (VCBs) that utilize series break technology effectively increase the switching capability for capacitive currents, elevate the withstand voltage level, and reduce the likelihood of restrike, all without compromising the breaking capacity for short‐circuit currents.
Yun Geng, Xiaofei Yao, Pu Chen, Rong Jia, Hannan Shan, Yingsan Geng, Zhiyuan Liu   +6 more
wiley   +1 more source

Methods for estimation of the vacuum status in vacuum circuit breakers [PDF]

IEEE Transactions on Dielectrics and Electrical Insulation, 1999
In this paper several methods are described for the estimation of the pressure inside vacuum interrupters which have been in operation for many years. The methods are applicable without demounting the interrupters and use only electrical measuring techniques.
Merck, W.F.H., Damstra, G.C., Bouwmeester, C.E., Gruntjes, R.J.B.   +3 more
openaire   +2 more sources

Impact Factor Identification for Switching Overvoltage in an Offshore Wind Farm by Analyzing Multiple Ignition Transients

IEEE Access, 2019
This paper investigates the impact factors of switching transient overvoltage (SOV) in an offshore wind farm (OWF) by analyzing multiple ignitions of a vacuum circuit breaker.
Jiujiang Zhou, Yanli Xin, Wenhu Tang, Gang Liu, Qinghua Wu   +4 more
doaj   +1 more source

Counter‐Plantation Imaginaries: Deproletarianisation and Struggle for Autonomy in India

Journal of Agrarian Change, EarlyView.
ABSTRACT This article examines the decline of the 2015 Pembillai Orumai movement in India's Munnar tea belt as an event revealing the dialectical relationship between labour struggle and agrarian capitalism within the plantation complex. Although widely celebrated for securing wage gains through a historic Dalit woman–led strike, the movement's rapid ...
Jayaseelan Raj
wiley   +1 more source