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Investigation of grounding resistance effect on the MV grid of Hellenic electromotive railway during lightning strikes

机译：雷击期间Hellenic电动机铁路MV网格接地抗性影响的研究

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The paper discusses the effect of the grounding resistance on the transient response of MV railway grid during lightning strikes. For study purposes were modelled the electrified railway MV grid (ERMV) that the Hellenic electromotive suburban railway makes use, including the masts, consoles, the rails and the overhead medium-voltage transmission grid of 25kV dedicated for this purpose. For the simulation of the understudied model time-domain solver was adopted in ATP-EMTP software. The model Volt-Time Curve is used for the modeling of the insulator, but it was necessary to create a new equation for the specific model, because of the short length of the insulator in such projects. Two types of lightning are used for the simulation purposes, for fast and slow signal, with current value in lOOkA and one measurement in 30kA. For fast signal, the values of front and tail time are 1.2/50μs and for the slow signal 10/350μs. In addition, for the ground resistance: 10?, 70? and 245? are used.
机译：本文探讨了雷击过程中耐射对MV铁路网瞬态响应的影响。对于学习目的，建模了Hellenic电动郊区铁路使用的电气化铁路MV网格（ERMV），包括桅杆，控制台，轨道和架空介质 - 电压传输网格为此目的。对于ATP-EMTP软件采用了仿真所清楚的模型时域求解器。模型电压曲线用于绝缘体的建模，但是由于在这些项目中的绝缘体短的长度短的长度，所以必须为特定模型创建新的方程。两种类型的闪电用于模拟目的，用于快速和慢速信号，在LIGHA中具有电流值和30kA的一个测量。对于快速信号，前部和尾时间的值为1.2 /50μs，并且对于慢速信号10 /350μs。另外，对于地电阻：10？，70？和245？使用。

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