Results 51 to 60 of about 2,008 (171)
Dianci bileiqi, 2011 MOV型SPD在运行时,一些因素会使MOV启动后的电流过大,电流发热量超出MOV热容量就会使SPD失效。国家标准中热稳定实验考查的就是MOV对于这种热量累积的耐受程度。对国家标准中关于MOV（Metal Oxide Varistor）型SPD（Surge Protective Device）的热稳定性判断条件进行试验和分析,对比了直流和交流电压两种情况下的热量累积并设计试验。把直流电和交流电热累积统一到"热阻"的概念,试验表明,直流电造成的SPD发热量比交流电造成的SPD发热量大10%。
杨天琦, 王振会, 朱传林, 孙涌
doaj
STUDY ON SURGE ARRESTER PERFORMANCE DUE TO LIGHTNING STROKE IN 20 KV DISTRIBUTION LINES [PDF]
, 2009 Abstrak Electric energy has been transmiting from power station to end user with transmission and distribution lines. Lightning strokes are problems that occure in transmission and distribution lines and make them fault when the electric energy were ...
Liliyana NS, Liliyana NS +2 more
core
A Device for Investigating the AC Characteristics of Metal Oxide Varistors
IET Power Electronics, Volume 18, Issue 1, January/December 2025.This study presents an insulated‐gate bipolar transistor‐based device designed to address the limitations of existing power supply systems, which are unable to simultaneously maintain waveform stability and provide sufficient power when varistors operate in the non‐linear region. ABSTRACT In recent years, the AC characteristics of metal oxide varistors
Xinyan Xiao, Lanjun Yang, Yonggang Yue
wiley +1 more source
A novel thyristor‐based hybrid DC circuit breaker with short arcing capability
High Voltage, Volume 9, Issue 6, Page 1288-1301, December 2024.Abstract Multi‐terminal flexible high‐voltage direct current (HVDC) transmission and DC grid technology are developing rapidly. The hybrid DC circuit breaker (HCB) has broad application prospects in the field of HVDC transmission and DC power grid. Nevertheless, existing HCBs have one or more following blemishes: arc suppression scheme of mechanical ...
Guanlong Jia +4 more
wiley +1 more source
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 +5 more
doaj
A Study on Modeling of a Surge Protection Device [PDF]
, 2015 This paper presents a modeling of a surge protection device based on V-t curve characteristic. Metal oxide varistor (MOV) is one of common surge protection devices to protect following electric devices from over-voltage such as the lightning and ...
25620 +18 more
core
Architecture, Voltage and Components for a Turboelectric Distributed Propulsion Electric Grid [PDF]
, 2015 The development of a wholly superconducting turboelectric distributed propulsion system presents hide unique opportunities for the aerospace industry.
Armstrong, Michael J. +6 more
core +3 more sources
Detection of failures in HV surge arrester using chaos pattern with deep learning neural network
IET Science, Measurement &Technology, Volume 18, Issue 9, Page 603-615, November 2024.This paper proposes a fault diagnosis method for HV surge arresters based on the chaotic system and CNN. Compared to AlexNet, HOG+BPNN, HOG+SVM, HOG+DT, and HOG+KNN detection methods, the accuracy of the method proposed in this paper is 97%. Abstract As a protective component of HV equipment, the primary function of a surge arrester is to mitigate the ...
Chun‐Chun Hung +3 more
wiley +1 more source
基于经验傅里叶分解的混合式高压直流断路器耗能支路故障检测方法研究 [PDF]
全球能源互联网为实现更强的能量耗散能力，混合式高压直流断路器的耗能支路需串并联大量金属氧化物压敏电阻（metal oxide varistor，MOV），耗能支路的可靠性将直接影响混合式高压直流断路器的可靠性。但是，现有的耗能支路故障检测方法并不能适应整个能量耗散阶段。为此，提出一种基于经验傅里叶分解的混合式高压直流断路器耗能支路故障检测方法，具体为：首先是信号预处理，对耗能支路每个子模块的分支电流进行归一化和一阶差分计算来获取分析电流；然后是故障特征提取，利用经验傅里叶分解（empirical Fourier ...
彭兆伟 +5 more
doaj +1 more source
Influence of Intrinsic Trapping on The Performance Characteristics of ZnO-Bi 2 [PDF]
, 1994 The lumped parameter/complex plane analysis technique reveals several contributions to the ac small-signal terminal immittance of the ZnO-Bi2O3 based varistors' grain-boundary response.
Mohammad A. Alim
core +2 more sources