NDLI: Switching transients in a 2 × 15 kV 16.7 Hz autotransformer railway system

Content Provider	IET Digital Library
Author	Chmielewski, Tomasz Oramus, Piotr Koska, Krzysztof
Abstract	This study presents the analysis of transient states generated along the traction catenary during switching operation in the main supply substation unit. For this purpose, a Swedish autotransformer railway system operating at 15 kV and 16.7 Hz has been chosen as a reference. The simulations of abovementioned system were conducted using EMTP-ATP software. This study presents results of simulations for various conditions and at different loads. The main outcome of the analysis is determination of transient currents and voltages in the system during catenary energisation and de-energisation process. Due to the presence of saturable autotransformers along the catenary the flow of excessive inrush current may lead not only to the overloading and as a consequence main breaker tripping but may also cause slow-front overvoltages. In order to represent the worst case conditions parametric study was performed. It includes variable tripping time of the main circuit breaker and pre-existing residual core flux. The results of the analysis show that the system response is strongly dependent on the breaker closing and opening times. As a consequence, it is possible to determine safe switching conditions in order to avoid large overvoltages or accidental tripping.
Starting Page	235
Ending Page	240
Page Count	6
ISSN	17518687
Volume Number	12
e-ISSN	17518695
Issue Number	Issue 1, Jan (2018)
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/iet-gtd/12/1
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/10.1049/iet-gtd.2017.0808
Journal	IET Generation, Transmission & Distribution
Publisher Date	2017-08-18
Access Restriction	Open
Rights Holder	© The Institution of Engineering and Technology
Subject Keyword	Accidental Tripping Catenary Energisation Process Circuit Breaker Deenergisation Process EMTP-ATP Software Frequency 16.7 Hz Inrush Current Main Breaker Tripping Main Circuit Breaker Main Supply Substation Unit Mathematical Analysis Overvoltage Preexisting Residual Core Flux Railway Electrification Safe Switching Condition Slow-front Overvoltages Substations Swedish Autotransformer Railway System Switch Switching Transients System Response Traction Transient Analysis Transient Current Transient State Transportation Variable Tripping Time Voltage 15 KV
Content Type	Text
Resource Type	Article
Subject	Control and Systems Engineering Energy Engineering and Power Technology Electrical and Electronic Engineering

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