Occurrence and Countermeasures for High-frequency Reignition Oscillation in Vacuum Switch for Shinkansen Changeover Section.

Mochinaga, Yoshifumi; Ajiki, Kohji; Ishikawa, Sakae; Okada, Tadayoshi; Funaji, Takuo

doi:10.1541/ieejias.111.777

Cited by 5 publications

(4 citation statements)

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“…The resistor's power loss is reduced to 0.95 kW. Compared to the methods in [21] and [22], the power loss is reduced by at least 20.8%. This is helpful to reduce the burden on the cooling system and increases the service life of the resistors.…”

Section: Simulation and Experimental Resultsmentioning

confidence: 97%

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Electromagnetic transient suppression for thyristor switch‐based auto‐passing neutral section system

Liran,

Mingli,

Qiujiang

et al. 2023

IET Power Electronics

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The auto‐passing neutral section (ANS), applied in the traction substation or section post (SP), is one of the effective methods to improve the continuity of power supply, and the electromagnetic transient is the key issue impacting its application value. An equivalent switching circuit is established to reveal the causes of the electromagnetic transient. The suppression methods for reducing transient overvoltage and inrush current are proposed, adopting an improved RLC filter to suppress the transient overvoltage with low active power loss, and a switching strategy to minimize magnetic flux variation. The correctness of the proposed methods has been confirmed by simulation and experimental results, which can improve the transient performance and increase the practicality of the ANS.

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Section: Simulation and Experimental Resultsmentioning

confidence: 97%

“…[21] proposed an RC method, but the resistive power loss amounts to 6.5 kW, which is too high for the cooling system. An RLC method was introduced in [22], this helps to reduce power losses to 1.2 kW, but the parameter calculation process is unknown and the power loss still needs to be reduced. Ref.…”

Section: Introductionmentioning

confidence: 99%

Electromagnetic transient suppression for thyristor switch‐based auto‐passing neutral section system

Liran,

Mingli,

Qiujiang

et al. 2023

IET Power Electronics

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show abstract

“…There are some similar cases in a number of instances where the transient overvoltage by the resonance phenomena exceeds transformer BIL, resulting in failures. For examples, Shinkansen railway power system in Japan and railroad substation in USA [12][13][14] had gone through similar failures.…”

Section: Evaluation On System Resonancementioning

confidence: 99%

Detailed Study on Insulation Coordination of a 25kV Power System Connected with a VCB and Transformer

Baek¹,

Kim²

2017

Journal of Electrical Engineering and Technology

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Recently, unusual transformer failures have been reported in 25kV power systems connected with a VCB and transformer. In this study, performance of the protection system, dielectric strength of the transformers, characteristics of switching surges and resonance phenomena were analysed and assessed. All investigations regarding the insulation breakdown of the transformers were carried out by simulations, laboratory tests, factory tests and on-site measurements in order to thoroughly investigate the root causes. Furthermore, experimental methods for investigating the resonance phenomenon were derived and tests were conducted applying the derived method to recreate the phenomenon in the transformer. It is found that resonance between the transformer and switching surge generated by closing a VCB can initiate the breakdown of internal windings of a transformer.

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“…As a transient surge phenomenon concerning to the changeover section, a surge caused by the high frequency reignition oscillation in vacuum switchgear was investigated in detail more than 10 years ago (2) by a group of RTRI (Railway Technical Research Institute). The phenomenon happened, however, when the switchgear was closed with train load ("Procedure 3" in Fig.…”

Section: Measurement Of the Discharge Currentmentioning

confidence: 99%

Investigation of Closing Surge in Shinkansen Power System and Proposal of a Novel Power Electronics Application for Changeover Section

et al. 2006

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In this paper, the closing surge phenomena of the Shinkansen changeover section is described based on the detail measurements on the operational substations. In Shin-Tabata substation, the frequent work of the lightning arrester for changeover section is observed and it becomes the slight anxiety for daily maintenance. Fig. 1 shows the measured discharge current of the lightning arrester. The example of the voltage waveform which causes the arrester work is also shown in Fig. 2. It is clarified that the closing surge up to 100 kV leads to the 100 A discharge current. Following the description of the surge phenomena, a novel power supply system for Shinkansen changeover section (CSPS: changeover section power system) is proposed as one of the solutions to avoid such a over-voltage. By applying this system, the Shinkansen train is able to pass the changeover section without electrically transient phenomena including the closing surge and instantaneous power failure. Fig. 3 shows the configuration of the CSPS.Three special control methods, those are voltage and phase shift control, load transfer control and output restriction control, are proposed to make the inverter output stable. Its efficiency is conformed by both the computer simulation and the mini-model experiments. Such a power electronics application will be one of the idealistic devices for the advanced power system of the high speed railway transportation in the future. Paper Investigation of Closing Surge in Shinkansen Power System and Proposal of a Novel Power Electronics Application for Changeover SectionHitoshi Hayashiya * MemberYoshinobu Ueda * * MemberKoji Ajiki * * * MemberHideo Watanabe * * MemberMasato Ando * MemberMakoto Nakajima * Non-memberThe transient surge measurements at the changeover sections of Shinkansen power feeding system were carried out in some substations and sectioning posts. The detail of the surge voltage phenomena was investigated and the reason of the frequent discharge of the lightning arrester was clarified. As one of the solutions to avoid such a severe transient phenomena, a novel power supply system for a changeover section substitution for the conventional system with a pair of the vacuum switchgear was proposed. To realize a stable running through the changeover section where two power sources with phase difference are faced, some special control methods were introduced and their validities are confirmed by not only the computer simulations but also the mini-model experiments.

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Occurrence and Countermeasures for High-frequency Reignition Oscillation in Vacuum Switch for Shinkansen Changeover Section.

Cited by 5 publications

References 0 publications

Electromagnetic transient suppression for thyristor switch‐based auto‐passing neutral section system

Electromagnetic transient suppression for thyristor switch‐based auto‐passing neutral section system

Detailed Study on Insulation Coordination of a 25kV Power System Connected with a VCB and Transformer

Investigation of Closing Surge in Shinkansen Power System and Proposal of a Novel Power Electronics Application for Changeover Section

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