Overview of stray current control in DC railway systems

Niasati, Mohsen; Gholami, Ahmad

doi:10.1049/ic:20080043

Cited by 49 publications

(30 citation statements)

References 12 publications

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“…The fields in LV structures are too low to generate space charge injection and partial discharges in the normal way, and moisture ingress is likely to be a dominate issue. The effect of corrosion must be also considered since it is several times more severe under DC than AC [28].…”

Section: Discussionmentioning

confidence: 99%

Transition from alternating current to direct current low voltage distribution networks

Antoniou

Tzimas

Rowland

2015

IET Generation, Transmission & Distribution

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Maximising the capacity of the existing alternating current (AC) distribution network infrastructure by conversion to direct current (DC) may hold significant advantages. In particular it may provide a greater flow of electrical energy within urban areas, allowing a lower investment cost for adoption of electrical vehicles and domestic heating. Integration with Smart Grid applications will require maintained levels of reliability, and improved efficiency and flexibility. The transition of the cable infrastructure from the legacy low voltage AC system to low voltage DC is considered in this study. In particular this study investigates the limitations of DC supplied through the existing distribution network without major reconstruction , and proposes optimal configurations that could be adopted in a smart-DC distribution network. The implications for power flow in the network are considered with regards to existing cable limitations. It is concluded that a better understanding of cable and joint reliability is required before such changes are made to existing LV networks.

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Section: Discussionmentioning

confidence: 99%

Transition from alternating current to direct current low voltage distribution networks

Antoniou

Tzimas

Rowland

2015

IET Generation, Transmission & Distribution

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“…32 Moreover, the touch voltage and the stray currents by the means of grounding resistance are inversely proportional to each other. 33 As a result, it is hard to set these values for an optimal grounding. 34,35 Simultaneously setting the best values for both touch voltage and stray current for any grounding system is difficult.…”

Section: Groundingmentioning

confidence: 99%

Distributed generation hybrid AC/DC microgrid protection: A critical review on issues, strategies, and future directions

2020

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Summary The integration of distributed energy resources (DERs) with conventional systems emerges as an intelligent solution for providing uninterrupted and secure power even at times of high load demand. Better load management with a mature fault handling mechanism makes AC a viable option which has an efficiency of 78.24%. In contrast with less power loss and slightly better efficiency of 84.6%, DC microgrid is a reliable option in a low power environment. In order to accommodate all operating conditions and load types, a hybrid system can be designed with a theoretical efficiency of more than 90%. Bidirectional power flows, low inertia, the transition between different modes of operations are the challenges for the protection of alternating current (AC) and direct current (DC) microgrid systems. Power balance fluctuation, absence of zero‐crossing currents, selection of suitable grounding, and coordination between different rating devices restrict the hybrid system to achieve the said efficiency constantly. This paper reviews in detail of existing protection along with grid‐connected algorithms for both modes of operation. Finally, the limitation, major hurdles, and future course of action for a reliable, efficient, and secure hybrid grid system are figured out.

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“…The performance of a stray current collection system is highly dependent on the conductivity of the system Brought to you by | Bibliotheek TU Delft Authenticated Download Date | 12/11/17 2:40 PM itself and of the neighboring soil. Extremely high efficiencies can be achieved when the material surrounding the stray current collection system is highly resistive (Niasati & Gholami, 2008). The arrangement of a reinforcement mat, being bonded electrically back to the substation through parallel conductors, has therefore a dual function: (1) to prevent the corrosion of the reinforcement bars themselves and (2) to act as a secondary level of protection against stray currents penetrating the surrounding earth and possibly into buried services (Niasati & Gholami, 2008).…”

Section: Stray Current Collection Systemmentioning

confidence: 99%

“…Reprinted with permission from IEEE. (Niasati & Gholami, 2008). Reprinted with permission from IEEE.…”

Section: Railway Earthing Systemsmentioning

confidence: 99%

“…Therefore, by diverting most of the current into the bond rather than into the soil, the amount of corrosion of the metal structure will be reduced. A drainage bond ( Figure 21) is a metallic joint between the structure and rail that provides an alternative path for the stray current to return to the rail (Niasati & Gholami, 2008 In practice, for complex systems, the design of bonds is not a simple matter. The drainage bond connection to the underground structure should be located where the railway and the structure cross or where they are closest together.…”

Section: Electrical Drainage Bondmentioning

confidence: 99%

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A review on stray current-induced steel corrosion in infrastructure

2017

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Metallic corrosion can cause substantial damage at various levels and in almost all types of infrastructure. For metallic corrosion to occur, a certain external environment and the presence of corrodents are the prerequisites. Stray current-induced corrosion, however, is a rather underestimated issue in the field of corrosion and civil engineering. Stray current arising from power sources and then circulating in metal structures may initiate corrosion or even accelerate existing corrosion processes. The most frequent sources of stray current are light rail transits and subways, which are also main traffic tools with continuously accelerating urbanization all over the world. Stray currents from these systems may easily flow into nearby metallic structures, making stray current-induced corrosion the most severe form of damage of buried structures, such as tunnels, pipelines, and various underground reinforced concrete structures. The objective of this paper is to critically review stray current-induced steel corrosion in infrastructure with regard to sources of stray current and the characteristics and mechanism of stray current corrosion in view of electrochemical aspects. The methods and techniques for the evaluation, monitoring, and control of stray current-induced corrosion for steel and reinforced concrete structures are also presented and discussed.

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Overview of stray current control in DC railway systems

Cited by 49 publications

References 12 publications

Transition from alternating current to direct current low voltage distribution networks

Transition from alternating current to direct current low voltage distribution networks

Distributed generation hybrid AC/DC microgrid protection: A critical review on issues, strategies, and future directions

A review on stray current-induced steel corrosion in infrastructure

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