Results 61 to 70 of about 11,294 (165)

Integrated Learning‐Based Ageing Assessment of Silicone Rubber

open access: yesHigh Voltage, EarlyView.
ABSTRACT The surface ageing of silicone rubber composite insulators, widely used in power systems, poses significant challenges. This study integrates Fourier transform infrared (FTIR) spectroscopy with machine learning to evaluate ageing states and explore underlying mechanisms under various environmental conditions.
Xinzhe Yu   +7 more
wiley   +1 more source

Business Process Optimization for Relay Protection of State Grid Ningde Company [PDF]

open access: yes, 2016
电力行业是一个对社会经济影响极大,技术经济特征十分复杂的自然垄断产业。国家电网公司正面临电网规模不断扩大、智能电网技术快速发展、三集五大即人力、物力、财力集约化管理,大规划、大建设、大运行、大检修、大生产体系建设的体制改革等现状,而传统的管理方式已无法匹配国网公司的发展。本文以此为研究背景,以宁德供电公司为例,具体研究了大二次专业业务流程优化的相关问题。 首先,本文在对流程管理和流程优化理论进行认真分析的基础上,运用ECRSI分析法、标杆管理等相关理论,分析了宁德供电公司大二次专业业务流程现状 ...
郭茜婷
core  

Effect of Aggregation Structure on DC Electrical Performance of Thermo‐Oxidatively Aged Crosslinked Polyethylene Insulation

open access: yesHigh Voltage, EarlyView.
ABSTRACT Thermal ageing is an important factor leading to the deterioration of crosslinked polyethylene (XLPE) cable insulation. In this paper, XLPE insulating material was prepared in the laboratory and treated by thermal ageing at 130°C for durations of up to 40 days.
Bingrong Huang   +5 more
wiley   +1 more source

±1100 kV特高压直流工程换流变最优短路阻抗 [PDF]

open access: yes全球能源互联网, 2018
换流变压器是直流输电系统中最重要的设备之一,短路阻抗是确定整个直流系统成套设计方案的最重要输入条件,对直流主回路参数、短路电流、绝缘配合、无功配置、设备制造、大件运输、技术经济性等具有决定性作用。定量分析了±1100 kV特高压直流工程中以上因素对阻抗选择的影响,并提出了全寿命周期成本分析方法。基于此分析,以±1100 kV昌吉—古泉特高压直流工程为例,提出了该工程的最优阻抗推荐值,并应用于实际工程。
郭贤珊, 付颖
doaj   +1 more source

Extent of threats to marine fish from the online aquarium trade in the United States

open access: yesConservation Biology, Volume 40, Issue 1, February 2026.
The global marine aquarium hobby is a multibillion‐dollar industry, largely driven by demand from the United States. Much of this trade occurs online. We web scraped 4 major US‐based e‐commerce platforms selling marine aquarium fish to determine the retail price and source (wild capture, aquaculture, or both) of 13 families of ray‐finned marine fish ...
Bing Lin   +6 more
wiley   +1 more source

The study of bidirectional DC-DC converter in the DC microgrid [PDF]

open access: yes, 2016
作为新能源的有效利用方式之一的直流微电网没有无功功率的损耗,不需要跟踪频率和相位,可靠性和可控性有较大程度的提高,更适合分布式能源的接入和应用。双向DC-DC变换器承担着母线与储能之间能量双向流动的重要作用。同时,它还可以作为直流微电网之间的互联元件,具有十分重要的研究价值。 本文针对全桥拓扑结构的双向DC-DC变换器展开较为深入的研究。 首先,详细分析了在移相控制方式下,双向DC-DC变换器的在降压方向和升压方向的工作原理及零电压开关(ZVS,Zerovoltageswitching)的具体过程 ...
纪承承
core  

Risks of Time and Chronology as an Underpinning Infrastructure for Critical Systems: Emerging Chronorisks and Chronosecurity Needs

open access: yesJournal of Critical Infrastructure Policy, Volume 7, Issue 1, Spring/Summer 2026.
ABSTRACT Time and chronology form the invisible architecture upon which modern civilization depends, governing synchronization across markets, power grids, communication networks, transportation, and defense. Yet, this shared temporal framework, engineered through atomic clocks, satellites, and digital synchronization, faces growing vulnerabilities ...
Bilal M. Ayyub
wiley   +1 more source

新能源集群经柔直送出孤岛系统电压优化控制策略 [PDF]

open access: yes全球能源互联网, 2018
目前新能源集群电压分层控制研究主要针对接入交流电网的情况,由于孤岛系统的电压控制与交流大电网解耦,其优化控制的目标、对象和方式均与传统电网存在较大差异,故需要结合其特性,制定新的电压控制策略。本文对孤岛方式下新能源集群无功电压控制原理进行论述,设计了送出孤岛系统区域两级电压控制框架,提出了考虑换流站PQ运行区间约束的电压优化策略,在优化目标中综合考虑网损及换流站无功裕度。基于张北柔直示范工程未来规划拓扑的仿真算例表明,该策略可以在保持换流站母线电压在安全运行范围内的前提下 ...
吴林林, 徐曼, 刘辉, 张隽
doaj   +1 more source

Analysis and Design of the Audit Daily Management System of the Electric Power Company of Jiangxi Province [PDF]

open access: yes, 2015
现代信息社会对审计的冲击可谓是天翻地覆,国外先进的审计理论、技术和方式的大量涌入国内,审计数据正在成几何数量的增长,因此,数据日常信息的管理成为一个独立的业务来处理,需要大量的专业人员来处理相关事宜。信息化的高速发展对电网审计日常原始观念产生了巨大的冲击力,在形式和手段上都有所体现。形式上和手段上的转变,传统财务会计已经从纸制帐到转变成会计电算化,审计也相应从手工查帐到计算机审计。随着国家经济的发展,国家电网的飞速发展,伴随着基建项目的加速投建,因此,需要有大量的审计在建设过程中监督和指导 ...
章妤
core  

Securing Bangladesh's Nuclear Future: Is the Regulated Asset Base Model the Answer to Address Project Corruption?

open access: yesJournal of Critical Infrastructure Policy, Volume 7, Issue 1, Spring/Summer 2026.
ABSTRACT Bangladesh's goal of achieving high‐income status by 2041 requires dependable, low‐emission, and affordable energy. With near‐universal grid coverage and increasing demand, nuclear energy is a strategic asset for long‐term baseload supply. However, the existing financing model, typified by the country's most expensive $12.65 billion Rooppur ...
Hafiz Ahmed
wiley   +1 more source

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