Results 41 to 50 of about 488,244 (193)

Pilot protection for flexible HVDC transmission lines based on transient voltage ratio characteristics

International Journal of Electrical Power & Energy Systems
To address the problems of poor speed performance and the large influence of the distributed capacitance of traditional pilot differential protection, a pilot protection scheme based on the characteristics of the transient voltage waveform is proposed ...
Zhijie Wang, Haifeng Li, Haotian Jin, Hainan Liu, Yuansheng Liang, Gang Wang   +5 more
doaj   +1 more source

Over Voltage Protection for Household Equipments

International Journal for Research in Applied Science and Engineering Technology
This paper identifies the development of an over voltage protection in order to avoid damage in load side. Most of home appliances are expensive also more sensitive. This may get damaged due to the instabilities in ac mains supply. It can also lead to losses in the electrical circuit. These losses lead to low power factors and wastage of so much power.
openaire   +1 more source

Artifical Excitation of Ferro-Resonance for Testing Electrotechnical Equipment in Distribution Devices with Increased Voltage

Известия высших учебных заведений и энергетических объединенний СНГ: Энергетика, 2006
On the basis of the developed device for protection against of ferro-resonant and high-frequency cumulative over-voltages an algorithm for obtaining a voltage imitating ferro-resonant over-voltages is proposed in the paper.
Ye. V. Dmitriev, A. M. Hashimov, S. I. Hasanova   +2 more
doaj  

On-Site Protection Scheme for Microgrid with High Penetration Rate of Grid-Forming Inverter Interfaced Distributed Energy Resources

EAI Endorsed Transactions on Energy Web
INTRODUCTION: Renewable energy represented by grid forming inverter interfaced distributed energy resources is increasingly connected to microgrids that can operate independently and have various modes, resulting in traditional relay protection schemes ...
Yubo Yuan, Juan Li, Yunlong Jiang, Sudi Xu, Haiou Cao   +4 more
doaj   +1 more source

A Novel Solution for Overcoming Conflicts Between Line Protection and LVRT in MV Solar PV Interconnections

IEEE Access
The implementation of low-voltage-ride-through (LVRT) requirements for distributed generation (DG) sources in medium voltage (MV) distribution networks introduce challenges for the existing protection systems.
Anoop V. Eluvathingal, K. Shanti Swarup
doaj   +1 more source

1.7 kV IGBT Driver Based on Electromagnetism Isolation

Kongzhi Yu Xinxi Jishu, 2015
The basic characteristics of IGBT driver were analyzed and an IGBT driver based on electromagnetism isolation was designed. Chopping and short-circuit test researches on the driver were executed.
XIE Shunmeng, YANG Guang, OUYANG Liu, WEI Haishan, ZHANG Donghui   +4 more
doaj  

Protection of Transistors against over Voltage in Video Amplifiers

The Journal of the Institute of Television Engineers of Japan, 1963
映像機器にトランジスタが多用されるに従い, トランジスタ機器では真空管機器で従来あまり経験されなかった事故がしばしば発生することがある.このような問題点の一つである入力過大電圧によるトランジスタ増幅器の破損を取り上げ, 保護回路の設計要旨と実際についてのべる.
Marubayasi, Hiroshi, Ikeda, Hiroaki, Wakui, Kotaro   +2 more
openaire   +2 more sources

Optimization Method for Combination of Residual Current Protection and Coincidence Brake Logic in a Low-Voltage Distribution System

Shanghai Jiaotong Daxue xuebao
Low-voltage distribution systems frequently experience leakage current accidents. However, it is challenging to distinguish fault characteristics in abnormal operating conditions, such as electric shock to biological organisms and three-phase imbalance ...
XU Han, ZHU Sanli, ZHANG Tengfei, CHEN Shu, LIU Mingxiang
doaj   +1 more source

Over voltage protection device for ROV

, 2014
Supplying power to equipment always imposes a risk of damaging it. This risk is apparent in every application whether it be an industrial or a home appliance. One of these harmful occurrences is something like lightning which introduces a potentially harmful voltage in the system.
Kantzon, David, Lahti, Sebastian
openaire   +1 more source

A pilot protection scheme based on similarity comparison of voltage waveforms for active distribution networks

International Journal of Electrical Power & Energy Systems
In active distribution networks with a high penetration of distributed generation, the electrical characteristics of phase-to-phase short-circuit faults are significantly affected by factors such as distributed generation capacity and control strategy ...
Wei Cong, Shuang Liang, Fangyuan Wang, Yongliang Liang, Fang Peng, Zhexuan Shuai   +5 more
doaj   +1 more source