Influence of Series Choke on Damping of Switching Transients in Distribution Transformers

作     者：Marek Florkowski Marek Fulczyk Wojcicch Piasecki Magdalena Ostrogorksa Pawet Klyrs Jakub Furgat Marek Florkowski;Marek Fulczyk;Wojciech Piasecki;Magdalena Ostrogórksa;Pawel K(l)ys;Jakub Furga(l)

作者机构：ABB Corporate Research Center 31-038 Krakow Poland ABB Distribution Transformers 91-205 Lodz Poland Department of Electrical Engineering and Electrical Power AGH University of Science and Technology 30-059 Krakew Poland 

出 版 物：《高电压技术》 (High Voltage Engineering)

年 卷 期：2013年第39卷第10期

页      面：2492-2499页

核心收录：

学科分类：080801[工学-电机与电器] 0808[工学-电气工程] 08[工学] 

主　　题：配电变压器 扼流圈 瞬变 开关 阻尼 切换操作 网络经营 绝缘系统 

摘      要：Distribution transformers operating in modern system grids or in industrial networks are subjected to many switching transients,which may occur due to routine operations,network reconfigurations or as reaction on protection *** on the network configuration and parameters,such events may lead to external overvoltages and result in additional stresses on the insulation *** paper presents the influence of a series choke on damping of switching transients in distribution *** impact of the choke is assessed by both amplitude and rise time *** suppression of the transient rise time is shown for a test configuration involving distribution transformers connected to low loss cable lines and a medium voltage *** phenomena are especially typical for industrial networks where switching operations are very *** simulation and experiment results are *** results as well as measurement results confirmed that switching events can lead to high dU/dt and in consequence,can have adverse impacts on insulation *** escalation during switching event is strongly related with system *** results obtained for presented mitigation method are promising and indicate significant dU/dt reduction as well as number of ignitions and voltage peak *** protection of distribution transformers with a series choke is a new approach dedicated to environments prone to the occurrence of transients with high *** results show that the application of serial choke with suitable parameters realizes the reduction of dU/dt at the machines terminal from 24 kV/μs to 5 kV/μs,as well as the reduction of voltage peak value from 10 kV to 5 *** number of ignitions is also reduced.