Coordinated Surge Protection System in a TT Wiring System: A Comprehensive Analysis of Performance

Gomes, Chandima; Gomes, Ashen

doi:10.1109/sipda47030.2019.8951659

Cited by 3 publications

(2 citation statements)

References 8 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The installation of coordinated surge protection devices has been specified comprehensively elsewhere 49 . Further discussions on the subject can be found in Gomes 32 and Gomes and Gomes 50 .…”

Section: Ssl Imentioning

confidence: 99%

Defining lightning-safe structures for all socio-economic communities

Gomes

2022

S. Afr. J. Sci.

Self Cite

View full text Add to dashboard Cite

Four levels of lightning-safe structures are defined based on the protection expected from various lightning injury mechanisms under thunderstorm conditions. This work, therefore, provides clarification for the long-standing issue of determining the most suitable recommendation for lightning safety in various socio-economic layers of society, especially in underprivileged communities. These globally uniform and consistent guidelines will help standard development committees, lightning safety seekers and donors of protection systems, state policy developers on disaster management, the insurance sector and industries that provide lightning protection, in determining the most appropriate lightning safety measures for a given target, based on the safety requirements, societal behaviour and affordability.

show abstract

Section: Ssl Imentioning

confidence: 99%

Defining lightning-safe structures for all socio-economic communities

Gomes

2022

S. Afr. J. Sci.

Self Cite

View full text Add to dashboard Cite

show abstract

“…Note that although the positive stroke has the highest allocated peak currents, the negative current, especially the negative subsequent strokes poses the highest risk of induced over-voltages that could be harmful, due to the fast-rising edge. However, in this study, as our focus is direct strikes we confined only to the positive stroke, which could dissipate a significant amount of energy in victimized equipment [5,6].…”

Section: Introductionmentioning

confidence: 99%

Design of a Lightning Protection System for an Overhead 3 kV DC Electrified Railway Line: A Case Study from South Africa

Radhalal

Gomes

2021

IJEEI

Self Cite

View full text Add to dashboard Cite

A protection scheme is proposed for the 3 kV DC railway, in Kwa-Zulu Natal province, a region with a high lightning occurrence density. The surge protection was sought by implementing three metal-oxide surge arresters and an overhead ground wire. The purpose of these arresters is determined by their location in the circuit and the points that are vulnerable to adverse lightning effects: an arrester is installed to protect insulators between overhead lines and the supporting metallic mast, an arrester is installed to protect the point of contact between a stationary power supply wire and the train, and an arrester is installed to protect apparatus associated with the running tracks (return rail). An isolated earthing system is explored, and the effects of surge impedances and footing resistances are discussed. The voltage dropped across relevant vulnerable components and energy absorbed by the system components are determined by the simulation software Simulink. Lightning currents are injected into the system using Heidler function where the parameters comply with lightning protection standards. It is observed that the protection mechanisms defend susceptible components to a specified level. This demonstrates the success of the design in accordance with arrester protection levels (73.3 kV) and equipment withstand capabilities (a basic insulation level of 143 kV). This offers a protection margin of 95%. The largest percentage overshoot in the system is 39%, and this value is substantiated using reflection phenomena.

show abstract