Results 41 to 50 of about 2,108,671 (167)

Probe on Problems of Combined Overvoltage Protector in Lightning Protectio

Gong-kuang zidonghua, 2012
The paper analyzed accidents in application of combined overvoltage protector in a substation in Yangquan mining area of Shanxi province and a pumped storage power station in Hubei province. It introduced principle and working characteristics of combined
YI Xiao-fei, KANG Xiang, TENG Jin-zuo, LI Shan-shan   +3 more
doaj  

Mechanism of Quasi‐Power‐Frequency Resonant Overvoltage Triggered by Multiple Lightning Strikes in High‐Voltage Alternating Current Systems Equipped With Shunt Reactor

High Voltage, EarlyView.
ABSTRACT This paper investigates the generation mechanism of quasi‐power‐frequency resonant overvoltage triggered by multiple lightning strikes in high‐voltage alternating current (HVAC) systems equipped with shunt reactors. Based on field measurements from a 500 kV AC system, equivalent and simplified circuit models have been established to analyse ...
Tao Liang, Tao Cui, Zhengxi Wang, Tongwei Guo, Xiaohui Wu, Hong Zeng, Jie Guo, Yanzhao Xie   +7 more
wiley   +1 more source

Study on overvoltage of hybrid LCC-VSC-HVDC transmission

The Journal of Engineering, 2018
Hybrid line commutation converter-voltage-source converter high-voltage direct current transmission (LCC-VSC-HVDC) power transmission has unique technical advantages, but its overvoltage study is not sufficient at present.
Dizhen Xu, Xiaobin Zhao, Yuxin Lu, Kang Qin, Long Guo   +4 more
doaj   +1 more source

Induced voltage at the closest pole on parallel line due to direct triggered lightning on 10 kV double circuit distribution line

IET Generation, Transmission & Distribution, 2023
In 2019, triggered lightning was used to directly strike phase C of a 1.5 km, 10 kV double‐circuit distribution line in Guangzhou, China, with 2 flashes (13 return strokes) recorded.
Yating Zhao, Jianguo Wang, Li Cai, Quanxin Li, Yuqian Fang, Rui Su, Shoupeng Wang, Mi Zhou   +7 more
doaj   +1 more source

The Impact of Various Contact Structures on the Microscopic Surface Condition of Vacuum Interrupters During Capacitive Switching

High Voltage, EarlyView.
ABSTRACT The double‐break vacuum circuit breakers (VCBs) that utilize series break technology effectively increase the switching capability for capacitive currents, elevate the withstand voltage level, and reduce the likelihood of restrike, all without compromising the breaking capacity for short‐circuit currents.
Yun Geng, Xiaofei Yao, Pu Chen, Rong Jia, Hannan Shan, Yingsan Geng, Zhiyuan Liu   +6 more
wiley   +1 more source

Protection against transient overvoltage in precision AC-DC measurement system [PDF]

, 2020
: Reduction in size and improvement of sensitive margins in modern semiconductor devices makes them increasingly susceptible to stress and subsequent damage caused by the overvoltage.
Kgakatsi, Thato E., Golovins, Eugene, Dan-Valentin, Nicolae, Venter, Johan   +3 more
core   +1 more source

Transient stability enhancement of DC-connected DFIG and its converter system using fault protective device

Journal of Modern Power Systems and Clean Energy, 2017
Transient stability of doubly-fed induction generators (DFIGs) is a major concern in both AC and DC grids, and DFIGs must stay connected for a time during grid faults according to the power grid requirements.
Shaomin YAN, Aimin ZHANG, Hang ZHANG, Jianhua WANG, Bin CAI   +4 more
doaj   +1 more source

Zero‐Current Switching Based Model Predictive Control of a Double‐Extended Overlapped Alternate Arm Converter Used in the VSC–HVDC System

High Voltage, EarlyView.
ABSTRACT The alternate arm converter (AAC) is one of the most efficient multilevel topologies based on voltage source converters (VSCs), which has recently gained attention in various applications, particularly in high voltage direct current (HVDC) systems.
Ehsan Akbari, Milad Samady Shadlu
wiley   +1 more source

Application of Proportional Integral Derivative (PID) Control in Overvoltage Protection Systems for Low Voltage Network Loads

Emitor: Jurnal Teknik Elektro
Electricity is a very essential need for every element of society in this modern era, with electricity, various kinds of work can be easily done. However, in electricity distribution, there are often disturbances that can be detrimental to consumers, One
Abdul Muis Prasetia, Linda Sartika, Tirvan   +2 more
doaj   +1 more source

Comprehensive Design and Experimental Validation of 30 kV Ultra‐Fast Flexible Controllable Arresters for HVDC Systems

High Voltage, EarlyView.
ABSTRACT To effectively suppress transient overvoltages in HVDC systems, the design and experimental validation of a multi‐module series controllable arrester are presented. The voltage‐limiting performance, series voltage equalisation capability, and robustness under fault conditions in high‐voltage scenarios require further research.
Tai Yang, Xiangyu Zhang, Sihang Wu, Lei Qi, Xiang Cui   +4 more
wiley   +1 more source