Results 41 to 50 of about 188 (115)
High Voltage, Volume 9, Issue 4, Page 773-785, August 2024.Abstract In the past three years, a number of oil‐immersed ultra‐high‐voltage shunt reactors have experienced discharge defects when being put into operation, resulting in an overload of acetylene. However, detecting and identifying these discharge defects caused by switching impulse voltage is challenging under steady‐state conditions.
Simeng Li +5 more
wiley +1 more source
Research and application of UHV power transmission in China
High Voltage, Volume 3, Issue 1, Page 1-13, March 2018., 2018 The power demand increases rapidly in China; however, the areas of huge power demands are of longdistance from most areas of abundant energy resource in the country. Therefore,China put in great effort to develop ultrahigh voltage (UHV) power transmissionsystems to optimise its energy allocation.
Yinbiao Shu, Weijiang Chen
wiley +1 more source
Research on Ultra-Fast Transient Overvoltage Characteristics of Electric Locomotive
Applied SciencesOperating overvoltage occurs when the pantograph or main breaker of an electric locomotive is operated, which is prone to causing insulation failure of high-voltage equipment.
Yike Guo +3 more
doaj +1 more source
A New Cost Effective Approach to Suppress Very Fast Transients on Power Transformers Connected to Gas Insulated Substations [PDF]
, 2016 This thesis investigates the feasibility of a new method to prevent internal resonance in transformers connected to gas insulated substation due to very fast transient overvoltage in the GIS.
Babaeilaktarashani, Mehdi
core
IET Generation, Transmission &Distribution, Volume 18, Issue 8, Page 1611-1623, April 2024.This paper proposes a peak time of voltage travelling wave‐based protection scheme for DN with distributed generators using FRs as line boundary. Numerical simulation and experimental results verify that the proposed method can quickly and sensitively distinguish internal and external faults, and has high resistance to transition resistance.
Zhongxue Chang +3 more
wiley +1 more source
Shell circulating current and transient ground potential rise in 220 kV GIS
The Journal of Engineering, Volume 2017, Issue 13, Page 2555-2558, 2017., 2017 In recent years, gas‐insulated switchgear (GIS) become more and more important in the power grid. The distance between GIS shell and its internal conductor is short, which cause a strong electromagnetic coupling between these two parts. A travelling wave will occurred when the GIS isolating switch and circuit breakers are closed or broken down, which ...
Taiyu Chen +6 more
wiley +1 more source
Gaoya dianqi, 2023 在气体绝缘开关设备（gas insulated switchgear,GIS）中，隔离开关在操作过程中会产生快速暂态过电压（very fast transient overvoltage,VFTO），精确的隔离开关电弧模型对快速暂态过电压的仿真起着关键的作用。文中在分段电弧的基础之上，利用ATP-EMTP软件搭建了隔离开关多次重燃弧模型；为了研究负载端残余电荷对VFTO的影响，文中选取多组不同幅值的残余电压。仿真结果表明：基于分段电弧的多次重燃弧模型产生的VFTO谐波幅值比传统的时变电阻电弧模型要大 ...
张普, 莫付江, 刘欣桐, 王凡
doaj
Investigation of Transient Overvoltages on GIS Busbars and External Enclosures [PDF]
, 2017 Fast Front Transient Overvoltages and Very Fast Transient Overvoltages in a 380kV gas-insulated substation (GIS) located in Jeddah City have been studied and analyzed using PSCAD Software.
Alamoudi, Hussam Saeed +1 more
core +1 more source
High Voltage, Volume 9, Issue 1, Page 150-162, February 2024.Abstract As voltage measuring devices are widely used in the high voltage power system with a primary‐secondary‐fusion structure, electronic voltage transformers are directly connected to the primary conductor and would face much more serious electromagnetic environments than general secondary equipment.
Houda Zhu +5 more
wiley +1 more source