Results 71 to 80 of about 457 (219)
Back Flash Overvoltage Damages All DC/AC Converters in Photovoltaic Systems
IEEE AccessThis research addresses real faults in photovoltaic (PV) systems in Cuba, as these faults result in damage to all converters, whether in operation or not, when atmospheric discharge strikes nearby.
Osmel Perez Baluja +4 more
doaj +1 more source
, 2012 The Uninterrupted Power Supplies (UPSs) provide short term power back up to electrical loads when the mains power fail. Usually UPSs employ battery packs as the energy storage device.
Zhang, Xu
core
Zno varistor of low-temperature sintering ability
, 2011 [[abstract]]Zinc oxide (ZnO) varistors containing vanadium oxide as the principal additive and one or more cobalt oxides and/or manganese oxides additives exhibit excellent nonlinear current-voltage characteristics.
Wu, Tai-Bor;Tsai, Jyh-Kuang
core
Computer Aided Model for a Low Voltage Varistor with Increased Thermal Stability
, 2019 Metal Oxide Varistors are a very common power electronic device, applied for efficient overvoltage protection at any voltage level. This piece of equipment has a high non-linear current response function of the applied voltage, and, it provides a ...
Frigura-Iliasa, Mihaela; Politehnica University Timisoara +5 more
core +2 more sources
Loss and Thermal Modeling of Metal Oxide Varistors (MOV) Under Standard Current Surge Mission Profile [PDF]
, 2019 Because of their crucial role in protecting power electronic equipment against over-voltages and transients, metal oxide varistors (MOV) represent a key component of the electrical system. Although improper heat dissipation and internal temperature rises
Susanne Otto +11 more
core +1 more source
Metal Oxide Surge Arresters under Nonsinusoidal Voltage Stresses [PDF]
, 2019 Tato práce se zabývá vlivem vysokofrekvenčního napěťového zkreslení na omezovače přepětí pro vysokonapěťové aplikace. V rešeršní části jsou nejprve rozebrány základní typy svodičů používaných v soustavách vysokého napětí.
Ivan Chromeček
core
Processing of zinc oxide varistors : sources of defects and possible measures for their elimination
, 1997 The processing of ZnO varistors primarily follows the conventional ceramic route. A number of dopants are added to zinc oxide powder to prepare the constituent material and some additional finishing operations are performed for securing the varistor ...
Karim, A. N. Mustafizul +2 more
core +1 more source
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
Recycling Zinc from Metal Oxide Varistors Through Leaching and Cementation of Cobalt and Nickel [PDF]
, 2017 Metal oxide varistors (MOVs) are housed in a surge arrestor and composed of zinc oxide (> 90 wt%) and other metal oxides such as antimony, bismuth, cobalt, manganese, and nickel.
Steenari, Britt-Marie, +5 more
core +1 more source
Power Electronic Devices and ComponentsThis article conducts practical tests on four different configurations of solid-state DC circuit breakers (SS-DCCBs), investigating fault detection and circuit interruption phenomena in DC systems.
Mehdi Moradian +2 more
doaj +1 more source