Pantograph Arcing's Impact on Locomotive Equipments

Li, Tianzhi; Wu, Guangning; Zhou, Lijun; Gao, Guoqiang; Wang, Wangang; Wang, Bo; Liu, Donglai; Li, Dajian

doi:10.1109/holm.2011.6034812

Cited by 15 publications

(9 citation statements)

References 2 publications

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“…A wide range of injected electromagnetic frequencies have been observed during arc occurrence where some of them can excite resonant frequencies of the employed network components (such as filters and contact lines) [10,30], together with DC components induced in AC signals as a result of current interruption due to arcing [18]. Other conducted electromagnetic disturbances resulting from arcs are voltage transients and oscillations [8,30,31]. Low and high frequency oscillations spanning up to hundreds of MHz due to arcing phenomenon [7,22] have been electromagnetically radiated to nearby circuits, and potentially interfering with signaling and radio communications systems [7,8,[10][11][12]32].…”

Section: Definition Mechanism Of Occurrence and Impact Of Electric Armentioning

confidence: 99%

A Novel Arc Detection Method for DC Railway Systems

et al. 2021

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Electric arcing due to contact interruption between the pantograph and the overhead contact line in electrified railway networks is an important and unwanted phenomenon. Arcing events are short-term power quality disturbances that produce significant electromagnetic disturbances both conducted and radiated as well as increased degradation on contact wire and contact strip of the pantograph. Early-stage detection can prevent further deterioration of the current collection quality, reduce excessive wear in the pantograph-catenary system, and mitigate failure of the pantograph contact strip. This paper presents a novel arc detection method for DC railway networks. The method quantifies the rate-of-change of the instantaneous phase of the oscillating pantograph current signal during an arc occurrence through the Hilbert transform. Application of the method to practical pantograph current data measurements, demonstrates that phase derivative is a useful parameter for detecting and localizing significant power quality disturbances due to electric arcs during both coasting and regenerative braking phases of a running locomotive. The detected number of arcs may be used to calculate the distribution of the arcs per kilometre as an alternative estimation of the current collection quality index and consequently used to assess the pantograph-catenary system performance. The detected arc number may also contribute to lowering predictive maintenance costs of pantograph-catenary inspections works as these can be performed only at determined sections of the line extracted by using arcing time locations and speed profiles of the locomotive.

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Section: Definition Mechanism Of Occurrence and Impact Of Electric Armentioning

confidence: 99%

A Novel Arc Detection Method for DC Railway Systems

et al. 2021

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“…Although often neglected, MV connecting cables between TPS and the traction line may give a significant additional capacitance, which can bring the "natural" resonance of the supply section to a lower frequency (see considerations on the relevance of such parameters for exact fitting of measured frequency response in [29]). Similarly, adding capacitance to the train, as for the roof's HV cable joining the two pantographs or a separate capacitor for arcing emission reduction [28], reduces the resonance frequency.…”

Section: Network Resonancementioning

confidence: 99%

“…HFOs, along with causing overvoltages, are sometimes interpreted as a PQ problem, where network resonances are excited by the rolling stock harmonic emissions and by transient phenomena, such as the electric arc at pantograph [28]. Network resonances are of course subject to variability depending on loading and the relative position and the type of trains in the supply section, although the theory of the one-dimensional transmission line suggests that main resonances do not depend on train position [9,14].…”

Section: Introductionmentioning

confidence: 99%

Detection of Harmonic Overvoltage and Resonance in AC Railways Using Measured Pantograph Electrical Quantities

Mariscotti

Sandrolini

2021

Energies

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Harmonic resonances are part of the power quality (PQ) problems of electrified railways and have serious consequences for the continuity of service and integrity of components in terms of overvoltage stress. The interaction between traction power stations (TPSs) and trains that causes line resonances is briefly reviewed, showing the dependence on infrastructure conditions. The objective is monitoring of resonance conditions at the onboard pantograph interface, which is new with respect to the approaches proposed in the literature and is equally applicable to TPS terminals. Voltage and current spectra, and derived impedance and power spectra, are analyzed, proposing a compact and efficient method based on short-time Fourier transform that is suitable for real-time implementation, possibly with the hardware available onboard for energy metering and harmonic interference monitoring. The methods are tested by sweeping long recordings taken at some European railways, covering cases of longer and shorter supply sections, with a range of resonance frequencies of about one decade. They give insight into the spectral behavior of resonances, their dependency on position and change over time, and the criteria needed to recognize genuine infrastructure resonances from rolling stock emissions.

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“…Ref. [24] can suppress the overvoltage caused by pantograph arcing by paralleling a capacitance in the high-voltage side of the traction transformer, but it fails to provide detailed design of such a capacitance in practice. Different from ref.…”

Section: Introductionmentioning

confidence: 99%

A Supercapacitor-Based Method to Mitigate Overvoltage and Recycle the Energy of Pantograph Arcing in the High Speed Railway

Xu¹,

Chen²,

Cheng³

et al. 2019

Energies

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The pantograph arcing phenomenon may shorten the service life of a pantograph and even destroy onboard devices and instruments, due to the irregular motions of the train and the intermittent line–pantograph disconnection. This paper points out that abrupt inductive energy from the magnetizing inductance of the traction transformer can lead to an electromagnetic transient process with unexpected overvoltage across it. Further, a supercapacitor-based power electronic system is proposed, which can not only redirect the inductive energy to the supercapacitor pack through bidirectional converters but also mitigate the overvoltage across the main electrical equipment when pantograph arcing occurs. Simulation results show the overvoltage could be reduced and the energy stored in the supercapacitor which could also be used to provide energy for sensors or other devices.

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Pantograph Arcing's Impact on Locomotive Equipments

Cited by 15 publications

References 2 publications

A Novel Arc Detection Method for DC Railway Systems

A Novel Arc Detection Method for DC Railway Systems

Detection of Harmonic Overvoltage and Resonance in AC Railways Using Measured Pantograph Electrical Quantities

A Supercapacitor-Based Method to Mitigate Overvoltage and Recycle the Energy of Pantograph Arcing in the High Speed Railway

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