Results 61 to 70 of about 17,685 (234)

Dynamic Behaviour of Bubbles in Oil Under Electrothermal Ageing

High Voltage, EarlyView.
ABSTRACT During long‐term operation of converter transformers, the internal oil–pressboard insulation undergoes irreversible degradation. Partial discharge in the weakened insulation will cause the formation of a large number of bubbles in the insulating oil.
Hongbin Wu, Zhaoyang Kang, Ze Li, Zhongyu Zhao, Shuqi Li, Fuqiang Ren, Hongshun Liu, Qingquan Li   +7 more
wiley   +1 more source

Type Tests for Hybrid HVDC Breakers: a Technical Feasible Solution

, 2023
In the coming years, the use of the HVDC circuit breakers will become a necessity in the “grids of the future” (basically multi-terminal HVDC grids). An obliged step is to test such equipment before to install it on the grids.
Roy Maarten Nijman, Shankar Subramany, Sino Patti, Giuseppe Pelliccione, Massimo Marzinotto   +4 more
core  

Development of ± 550 kV DC GIS Basin Insulator

High Voltage, EarlyView.
ABSTRACT The basin insulator is a core component of the insulation system for ± 550 kV gas‐insulated switchgear (GIS). This paper, using a finite element method for multi‐physics simulations of electric–thermal coupling, determines a geometry suitable for the industrial production of ± 550 kV GIS basin insulators.
Shaohua Cao, Chengwei Jing, Siqiong Zhang, Zuodong Liang, Zehao Zhang, Fangwei Liang, Yong Yang, Geng Chen, Jinliang He, Chuanyang Li   +9 more
wiley   +1 more source

About the Ageing‐Induced Modifications of Physical‐Chemical and Electrical Properties of Polyimide (PMDA‐ODA) Under Gamma Radiation and High Temperatures

High Voltage, EarlyView.
ABSTRACT This study investigates the effects of radiation‐induced ageing on the physical, chemical, mechanical and electrical properties of Poly[4,4′‐oxydiphenylene‐ pyromellitimide] (PMDA‐ODA) polyimide, a high‐performance insulation material widely used in aerospace applications.
Simone Vincenzo Suraci, Jizhu Jin, Davide Mazza, Davide Fabiani   +3 more
wiley   +1 more source

Voltage Source Converter based High Voltage Direct Current Transmission: A Comprehensive Review of Control Strategies, Developments and Trends [PDF]

E3S Web of Conferences
The continuous increasing progress in high power and high voltage semiconductor devices leads to have a substantial impact on optimization and effective management of electric grids. These developments have great influence on High Voltage Direct Current (
Gangikunta Manohar, B Pakkirayya, Murugan A.S.S., Kar Rajib Kumar   +3 more
doaj   +1 more source

Design and tests of reinforcement-learning-based optimal power flow solution generator

Energy Reports, 2022
Optimal power flow (OPF) is a very traditional problem in the research field of power systems. In this paper, an OPF solution generator based on reinforcement learning (RL) is proposed. The solution process of OPF is modeled as a one-step Markov Decision
Hongyue Zhen, Hefeng Zhai, Weizhe Ma, Ligang Zhao, Yixuan Weng, Yuan Xu, Jun Shi, Xiaofeng He   +7 more
doaj   +1 more source

New HVDC technology in Pan-European power system planning

, 2019
High Voltage Direct Current (HVDC) technology will play a more central role in the future grid development than it had in the past due to the technological developments, the increasing use of renewable energy resources and the more ambitious European ...
Aluisio, B., Calcara, L., G. Donnini, C. Giordano, S. Lauria, A. L'Abbate, B. Aluisio, Scavo, F., L. Michi, E.G. Luciano, Ch. Vergine, Luciano, E. G., Michi, L., Donnini, G., Pompili, M., Giordano, C., Lauria, S., L. Calcara, Vergine, C., M. Pompili, F. Scavo, L'Abbate, A.   +21 more
core   +1 more source

Configurations and earthing of HVDC grids [PDF]

2013 IEEE Power & Energy Society General Meeting, 2013
HVDC grids are considered to be essential building blocks for the future upgrade of the existing AC power system and as a means to transport the expected massive amounts of renewable energy from remote sources to the load centers. HVDC systems exist for over 50 years, yet meshed DC grids do not exist so far.
De Boeck, Steven, Tielens, Pieter, Leterme, Willem, Van Hertem, Dirk   +3 more
openaire   +1 more source

A Novel Converter Transformer DAM‐LSTNet Vibration Generation Model for Data Imbalance Identification

High Voltage, EarlyView.
ABSTRACT Converter transformer vibration failures, primarily because of winding and core vibrations, severely impact the safe operation of high voltage direct current (HVDC) systems. These vibrations are influenced by voltage and current, and are transmitted through transformer oil and structural components to the tank. Current numerical models fail to
Peiyu Jiang, Fanghui Yin, Liming Wang
wiley   +1 more source

Mechanism of Damage and Micro‐Characterisation of Irradiation‐Induced Free Radicals on the Epoxy Insulation of the Bridge Arm Reactors at High Altitude

High Voltage, EarlyView.
ABSTRACT Damage degradation of epoxy resin insulating materials by free radicals triggered by the ultraviolet irradiation environment at high altitude has become a key issue that restricts the reliability of the bridge arm reactor at high altitude.
Liang Zou, Xinya Luo, Zhiyun Han, Zhen Li, Xiaofeng Ding, Kejie Huang   +5 more
wiley   +1 more source