Figure 1 - uploaded by Ya Ping Du
Content may be subject to copyright.
Diagram of the railway TPS MW-message wire CW-contact wire AFW-auxiliary feeder wire AJW-auxiliary jumper wire FCRW-fault current return wire the substation. The rails are insulated from the earth and other trackside conductors to avoid the flow of the load current through the earth.
Source publication
This paper presented a modeling procedure for a DC traction power system (TPS) of electrified railway to study lightning transients with EMTP. The TPS included overhead lines, electric cables on the ground, masts and other associated components. The nonlinear ionization characteristic of earth resistance and the flashover characteristic of insulato...
Contexts in source publication
Context 1
... a DC traction power system of electrified railway, the locomotive is powered from overhead contact wires (CWs). These CWs are suspended from a messenger wire (MW) via droppers, which is supported on the hinged cantilever assembled to masts distributed along the track, as illustrated in Figure 1. Figure 1 shows the profile view and section view of a typical TPS in open track. ...
Context 2
... CWs are suspended from a messenger wire (MW) via droppers, which is supported on the hinged cantilever assembled to masts distributed along the track, as illustrated in Figure 1. Figure 1 shows the profile view and section view of a typical TPS in open track. The overhead line system is fed by the transformer rectifier units in a trackside substation via auxiliary feeder wires (AFWs) and auxiliary jump cables (AJWs). ...
Context 3
... fault current return wire (FCRW) runs along the trackside as well for connecting all the masts to the earth terminal of the substation. Both AFWs and FCRW are made of electric cables, and are laid in trough on the ground, as illustrated in Figure 1. ...
Similar publications
Estimation of the minimum lightning current causing backflashover of line insulation is of great importance for the calculation of the backflashover rate of overhead transmission lines. The minimum backflashover current can be estimated through simplified expressions or, more accurately, through computer simulations. The latter allow for the detail...
Railway transport dynamics cause rails in general to experience a time varying rolling contact load to add shear strain to that from traction and normal strain from the axle loads. These loading conditions together with the frictional heat at the contact interface alters the microstructure in the near-surface region of the rails and wheels. This pa...
In this paper, the procedures for evaluating the High Voltage (132kV, 275kV and 500kV) overhead lines performance due to lightning in TNB transmission is discussed. The historical tripping data is analysed and compared from the international standard IEC 60071-1 and other utility practices. Approaches for evaluating the performance i.e. software si...
The path of the lightning discharge shows characteristics of branching and tortuosity, and the lightning shielding failure of the transmission line also has statistical features. In this paper, an improved leader progression model using a fractal approach is introduced, which considers both the deterministic and stochastic features of the downward...
This paper presents a new method to harmonics elimination in AC electric railway system by single-phase active filter. In order to create the virtual phase, the Hilbert transform is employed and single-phase system transformed to two-phase symmetrical system. In this study, AC electric railway system consists of the Scott-transformer, autotransform...
Citations
... A disruption in transit operation and apparatus arises due to lightning surge voltages and electromagnetic interference that surely creates traffic havoc, and it is necessary to provide an appropriate lightning protection set-up. Such set-ups always result in the improvement and revision of existing surge arresters, earthing electrodes or earth mesh worthy for LRT traction power supply equipment and substations, and telecommunication and signalling systems [11][12][13][14][15][16][17][18][19]. At the end of the day, all these discussed insulation coordination studies primarily focus on the overhead wire system that most metro transits in the world employ. ...
This paper presents a study on the performance of a fourth rail direct current (DC) urban transit affected by an indirect lightning strike. The indirect lightning strike was replicated and represented by a lightning-induced overvoltage by means of the Rusck model, with the sum of two Heidler functions as its lightning channel base current input, on a perfect conducting ground. This study aims to determine whether an indirect lightning strike has any influence with regard to the performance of the LRT Kelana Jaya line, a fourth rail DC urban transit station arrester. The simulations were carried out using the Electromagnetic Transients Program–Restructured Version (EMTP–RV), which includes the comparison performance results between the 3EB4-010 arrester and PDTA09 arrester when induced by a 90 kA (9/200 µs). The results demonstrated that the PDTA09 arrester showed better coordination with the insulated rail bracket of the fourth rail. It allowed a lower residual voltage and a more dynamic response, eventually resulting in better voltage gradient in the pre-breakdown region and decreased residual voltage ratio in the high current region.
... And also did not analyze that lightning effect on the line upon its occurrence. Reference [12] noted in their work that earthing of an open track mask successfully reduces the voltage surge on the cable and stated that in the event where there is no dedicated earthing for the mast; the majority of the lightning current spreads through to the overhead wire. Reference [13] noted that it is very important to determine how the outcome of lightning stroke is, which depends majorly on the tower footing resistance and the wave impedances. ...
... d is length of the arrester column, (m); and n is number of parallel columns of meta-oxide disks. (12) eA = the discharged voltage, V, and then iA = the arrester current, A; τ is time constant, s. ...
... And also did not analyze that lightning effect on the line upon its occurrence. Reference [12] noted in their work that earthing of an open track mask successfully reduces the voltage surge on the cable and stated that in the event where there is no dedicated earthing for the mast; the majority of the lightning current spreads through to the overhead wire. Reference [13] noted that it is very important to determine how the outcome of lightning stroke is, which depends majorly on the tower footing resistance and the wave impedances. ...
... d is length of the arrester column, (m); and n is number of parallel columns of meta-oxide disks. (12) eA = the discharged voltage, V, and then iA = the arrester current, A; τ is time constant, s. ...
132 kV Transmission line shielding failure occurs when a lightning stroke escape the sky wire and hit the phase conductor thereby causing induced over voltage resulting to unplanned outage and possible equipment failure. Considering the economic cost of 132 kV transmission line outage on power companies and the inconveniences it has on the energy user, the need for improved protection is of paramount importance. By applying line meta-oxide surge arrester along the line to damp the over voltage effect of the shielding failures and Modeling the transmission line using PSCAD-EMTDC 4.5, the lightning response was improved and the lightning over voltage reduced to its barest minimum hence keeping the line healthy to the benefit of the power companies and the end users.
... And also did not analyze that lightning effect on the line upon its occurrence. Reference [12] noted in their work that earthing of an open track mask successfully reduces the voltage surge on the cable and stated that in the event where there is no dedicated earthing for the mast; the majority of the lightning current spreads through to the overhead wire. Reference [13] noted that it is very important to determine how the outcome of lightning stroke is, which depends majorly on the tower footing resistance and the wave impedances. ...
... Modeling of Meta-Oxide Line Surge Arrester (11) d is length of the arrester column, (m); and n is number of parallel columns of meta-oxide disks. (12) eA = the discharged voltage, V, and then iA = the arrester current, A; τ is time constant, s. ...
132kV Transmission line shielding failure occurs
when a lightning stroke escape the sky wire and hit the phase
conductor thereby causing induced overvoltage resulting to
unplanned outage and possible equipment failure. Considering the
economic cost of 132kV transmission line outage on power
companies and the inconveniences it has on the energy user, the need
for improved protection is of paramount importance. By applying
Line Meta-Oxide Surge Arrester along the to damp the overvoltage
effect of the shielding failures and Modeling the transmission line
using PSCAD-EMTDC 4.5, the lightning response was improved and
the lightning overvoltage reduced to its barest minimum hence
keeping the line healthy to the benefit of the power companies and
the end users.
Keywords---Mitigate, Shielding Failure, Lightning Phenomenon,
32kV, Transmission Line, Meta-Oxide Surge Arrester, PSCAD-EMTDC, Overvoltage
... The power from the traction system substations is delivered to the moving trains by an overhead catenary system [2,3] at voltage between 600 and 1500V. During this operation, the rail passenger vehicles are facing surge transient events [4][5][6][7] that can seriously damage the on-board equipment and cause major service interruption. These surges [8] can be predictable or unpredictable. ...
... These surges [8] can be predictable or unpredictable. In DC traction systems, surge transients are mainly the consequence of vehicle regenerative braking action [5], lightning strikes [6], [9][10][11] rectifier AC-side capacitor bank switching [12], and stored magnetic energy release [13] at fault clearing. The waveform and the energy level of the surge depend on the nature of the surge transient. ...
This paper presents an overvoltage analysis of the DC catenary in the DC powered railway system. The main objective is to study the sources of damages of on-board equipment and cause service interruption by the occurrence of the surge transients in rail passenger vehicles in the DC express traction system during the operation stage. During the testing phase, vehicle manufacturers must demonstrate the performance of the vehicles under the specified transients, but testing generally not available during design. Certain engineering analysis must be performed to ensure that the design will meet the transient requirements by using matlab. Meanwhile, the designer will meet the transient conditions such as the over voltages and over current protection devices which is coordinated at the system level. In response to these design challenges, detailed time-domain simulation models of a switching surge transient generator and the vehicle equipment is developed and compared with the experimental results. These models are used to evaluate vehicle system parameter sensitivity as well as to provide design guidelines like increased vehicle power system safety, reliability and availability. A maiden attempt is made for analyzing switching surge in express traction vehicles. Furthermore, this analysis can be extended to the Indian railway traction system.
During the operation of dc rapid transit systems, the rail passenger vehicles are subjected to surge transient events that can damage the on-board equipment, and cause service interruption. During the testing phase, vehicle manufacturers must demonstrate the performance of the vehicles under the specified transients. However, system testing is generally not available during design. Engineering analysis must be performed to ensure that the design will meet the transient requirements and that the overvoltage and overcurrent protective devices are coordinated on a system level. In response to these design challenges, detailed time-domain simulation models of a switching surge transient generator, and the vehicle equipment have been developed and validated experimentally. These models are used to evaluate vehicle system parameters sensitivity, as well as to provide design guidelines for increased vehicle power system safety, reliability and availability.
The study presents a railway system simulation model aimed to evaluate the safety requirements about touch voltage in the railway lines fed by 3 kV DC. In particular, the model analyses the transient period during a fault and the dynamic behavior of the DC circuit breaker. The graphical preprocessor ATP Draw of the ATP version of the Electromagnetic Transients Program (EMTP) has been used to develop the model.
