Results 31 to 40 of about 7,424,343 (94)

Interference Analysis of Very Fast Transient Overvoltages in Gas-Insulated Substations Using a Hybrid Algorithm

Sukkur IBA Journal of Emerging Technologies
The reliable and efficient computational approach for the cable interference in gas insulated substations (GIS) is presented. The hybrid domain decomposition method-multilevel fast multi-pole algorithm (DDM-MLFMA) is presented herein.
Muhammad Bilal, Hafiz Muhammad Azib Khan, Abdul Mueed, Kamran Liaqat Bhatti, Syed Safdar Raza, Muhammad Siddique   +5 more
doaj   +1 more source

Diagnostic analysis and protective measures of transient ground potential rise in a 1000 kv UHV substation

The Journal of Engineering, Volume 2019, Issue 16, Page 1144-1148, March 2019., 2019
With the continuous expansion of power grid capacity and growth of voltage levels, the transient ground potential rise (GPR) caused by the switchgear operation has become great threaten to the safety of the grid. In the startup operation of 500 kV part of Taizhou 1000 kV ultra‐high voltage (UHV) substation, the electromagnetic lock installed in the ...
Fubin Pang, Qiangsheng Bu, Yu Liu, Yubo Yuan   +3 more
wiley   +1 more source

A novel GIS breakdown location method based on natural frequency of transient voltage

High Voltage, Volume 10, Issue 4, Page 856-875, August 2025.
Abstract During on‐site withstand voltage tests of gas‐insulated switchgears (GIS), once a breakdown occurs, it is hard to locate the breakdown position due to the intricate branch structures and minimal breakdown energy. The existing methods may require the placement of a large number of sensors with unsatisfactory accuracy, which adversely affects ...
Qiang Sun, Dengwei Ding, Yanpeng Ge, Ziwei Zhang, Wensheng Gao, Weidong Liu, Ke Zhao, Bo Liu, Lei Wang, Jiaqi Qu   +9 more
wiley   +1 more source

A Novel Power Transformer Condition Monitoring System Based on Wide-Band Measurement of Core Earth Signals and Correlation Analysis With Multi-Source Data

IEEE Access, 2019
On-line condition monitoring and real-time fault detection are essential to protect power transformers from unscheduled outage of services. The core earth signals (CES) are valuable for fault detection and diagnosis of power transformers, as they are ...
Xuezhi Ke, Lisheng Pang, Xiang Dong, Zhaohui Li   +3 more
doaj   +1 more source

Defect recognition of oil‐pressboard insulation based on frequent arc reignition phenomenon under switching impulse voltage

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, Yukun Zhang, Yunfei Jia, Shengchang Ji, Yanhua Han, Wensen Wang   +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

A high speed and sensitive protection for distribution network with DGs using ferrite rings as line boundary

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, Jifei Yan, Chenhao Zhang, Guobing Song   +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, Hongshun Liu, Dongyang Hu, Xinghua Liu, Tianxi Xu, Xiaoshuai Yang, Liang Ji   +6 more
wiley   +1 more source

Analyses on an electronic voltage transformer's failure by its resonance with very fast transient overvoltage and suppression

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, Qing Chen, Hongbin Li, Yue Tong, Linshan Han, Yang Jiao   +5 more
wiley   +1 more source

Modeling of Common Mode Interference of Secondary Side of Potential Transformer in VFTO Excitation

Shanghai Jiaotong Daxue xuebao
Very fast transient overvoltage (VFTO) is generated during the operation of isolation switches and circuit breakers in substations, which can affect the safe and reliable operation of power secondary equipment through cable transmission and spatial ...
PANG Fubin, JI Jianfei, WU Xianqiang, ZHOU Mengxia, YAN Wei, XU Dong
doaj   +1 more source