Results 71 to 80 of about 236 (182)

串联补偿装置用MOV工况分析及其关键技术的研究

Gaoya dianqi, 2014
结合串联补偿装置的工作原理,仔细分析了金属氧化物限压器（metal oxide varistor,MOV）的工况,比较了TCSC与FSC不同构成的串联补偿装置中MOV的特点,对MOV的过电压保护和控制措施进行了较深入的讨论、总结。对设计MOV的关键技术——保护水平、能量耐受和工频电压稳定性、电流分布、特殊的短路电流释放能力等进行了深入研究。笔者根据国内某一500 kV交流电力系统串补工程的招标技术要求,设计了复合外套和瓷外套不同结构的MOV,产品通过了中国电力科学研究院的型式试验,满足工程需要。
赵冬一, 汤霖, 胡淑慧, 李凡, 常鹏, 王川   +5 more
doaj  

Lightning Surge Immunity of LED Road Luminaires: A Comparative Study of Hybrid SPD, EMI Filter, and TVS-Diode Protection Strategies

IEEE Access
This study presents an experimental evaluation of surge protection performance of a LED road luminaire subjected to standardized 8/ $20\mu $ s impulse stress.
Vasilios P. Androvitsaneas
doaj   +1 more source

Comparison of Surge Voltage Reduction and Economic Efficiency of DC SSCBs According to MOV and RCD Snubber Combination

IEEE Open Journal of the Industrial Electronics Society
Metal oxide varistor (MOV) is a nonlinear resistive element whose resistance decreases rapidly when the applied voltage exceeds a threshold value. A dc solid-state circuit breaker (SSCB) uses MOVs or MOV with resistor-capacitor-diode (RCD) snubber ...
Seong Jin Lim, Sung-Geun Song, Guangxu Zhou, Feel-Soon Kang   +3 more
doaj   +1 more source

A voltage-clamped bidirectional fault current limiter based on a three-winding coupled inductor for DC power grids

International Journal of Electrical Power & Energy Systems
The DC fault is a serious challenge to voltage-source-converter-based HVDC (VSC-HVDC) systems, and the fault current limiter (FCL) is one of the key measures to solve the DC fault and reduce the capacity of the DC circuit breaker.
Ziao Yuan, Siyuan Liu, Jinchao Chen, Zhiyuan Liu, Yingsan Geng   +4 more
doaj   +1 more source

Effects of Dopants and Processing Parameters on the Properties of ZnO-V₂O₅-Based Varistors Prepared by Powder Metallurgy: A Review. [PDF]

Materials (Basel), 2023
Lungu MV.
europepmc   +1 more source

Degradación y recuperación de varistores de ZnO

Boletín de la Sociedad Española de Cerámica y Vidrio, 2006
In the present work it was studied the main aspect that influences on degradation and physical-chemical properties at grainboundary region of metal oxide varistors and its consequences on microstructure and nonohmic electric properties.
Ramírez, M. A., Bueno, P. R., Valera, J. A., Márquez, M. A.   +3 more
doaj  

国际上基于数值仿真计算金属氧化物避雷器的研究进展

Dianci bileiqi, 2018
系统综述了基于数值仿真计算技术在金属氧化物避雷器（metal-oxide surge arresters,MOA）研究中的应用发展。共分3个方面:1)基于等效电路模型的数值仿真计算;2)基于电、机械与热的两或多物理量（场）耦合的金属氧化物电阻片（metal-oxide surge varistor,MOV）数值仿真计算;3)整只MOA的电场、温度场或多物理场耦合的数值仿真计算。对于MOV的建模和仿真计算,将来主要的努力方向是改进数学计算模型,以便可以描述ZnO晶界与时间和温度相关的特性 ...
赵冬一, 李凡, 汤霖
doaj  

A Comprehensive Study on the Quality of Commercially Available Medium Voltage Surge Arresters

IEEE Access
This paper presents a comprehensive study on the quality and reliability of commercially available medium voltage surge arresters, with particular emphasis on their electrical performance and structural degradation under aging conditions.
Kuba Wojcik, Marek Olesz, Leszek S. Litzbarski, Stanislaw Wojtas, Michal J. Winiarski, Daniel Jaworski, Marcin Lapinski, Pawel Lawniczak, Bartlomiej Andrzejewski   +8 more
doaj   +1 more source

Synergistic Effects of Pr₆O₁₁ and Co₃O₄ on Electrical and Microstructure Features of ZnO-BaTiO₃ Varistor Ceramics. [PDF]

Materials (Basel), 2021
Shaifudin MS, Ghazali MSM, Kamaruzzaman WMIWM, Wan Abdullah WR, Kassim S, Ismail NQA, Sa'at NK, Mohd Zaid MH, Mohd Fekeri MF, Matori KA.   +9 more
europepmc   +1 more source

DC-SSCB Snubber for Electric Propulsion Ships With Effective Surge Voltage Reduction and Fast Dissipation of Fault Current Energy

IEEE Access
This paper proposes a snubber circuit for SSCB that performs voltage clamping operation in two stages to reduce surge voltage. The surge voltage is suppressed in the first stage using a MOV with low operating initiation and clamping voltages.
Jae-Hun Cha, Guangxu Zhou, Sung-Geun Song, Feel-Soon Kang   +3 more
doaj   +1 more source