Application of controlled switching to 500-kV shunt reactor current interruption

Kobayashi, Takayuki; Tsukao, S.; Ohno, Isamu; Koshizuka, Tadashi; Nishiwaki, S.; Miyake, N.; Matsushita, K.; Saida, Toshiyuki

doi:10.1109/tpwrd.2003.809611

Cited by 17 publications

(3 citation statements)

References 6 publications

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“…Referring to the technical data provided by the manufacturer [23] and the investigation of the controlled switching performances [24], it is known that for the EHV CB, the rated opening time is 20 ms, and the reliable arcing time is above 9 ms, and the operating time dispersion can be limited within 1. (considering the safetymargin as 1.5 ms).…”

Section: Simulation Resultsmentioning

confidence: 99%

A Novel Fault Soft Interruption Scheme Suitable for Smart Circuit Breakers

2022

Proceedings of WCSE 2022 Spring Event: 2022 9th International Conference on Industrial Engineering and Applications

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With the rapid development of smart substations, the application of smart circuit breakers (CB) has acquired a substantial technical basis. One of the key issues is that the short-circuit current (SCC) and arcing duration time in fault interruption have great impacts on the life of CB. To this end, a novel fault soft interruption (FSI) scheme is proposed in this paper. First, a novel phaselet-based estimation algorithm is put forward, utilizing samples in an ultra-short time window, and thus the current zero-crossing points of the coming several cycles can be predicted accurately. Then, the earliest feasible zero-crossing point is determined, by which the CB is controlled to separate its contacts at the favorable instant when SCC descends below the interrupting rating (IR) safely while keeping the arcing time minimized. The simulation testifies the performance of the proposed scheme under various fault scenarios, such as time constants and fault inception angles. The results show that compared with the conventional way, the proposed scheme can prolong the life cycle of CB and cope with the potential excessive SCC risks at relatively less cost.

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Section: Simulation Resultsmentioning

confidence: 99%

A Novel Fault Soft Interruption Scheme Suitable for Smart Circuit Breakers

2022

Proceedings of WCSE 2022 Spring Event: 2022 9th International Conference on Industrial Engineering and Applications

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“…Phenomenon of overvoltage and inrush current usually occurred when locomotives passing the neutral section were introduced and analyzed and some solutions were proposed in papers (Takayuki et al, 2003;Eduardo, Sudip, & Ignacio, 2015;Marjan & Enrique, 1999;John & Klaus, 2001). One scheme was proposed to eliminate overvoltage and inrush current when passing the neutral section by way of controlling primary current to zero before disconnecting the locomotive's main breaker (Eduardo et al, 2015).…”

Section: Auxiliary Winding Of Electric Locomotivementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Research on uninterruptable power supply technology for auxiliary winding of electric locomotive while passing the neutral section

2024

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PurposeAuxiliary power system is an indispensable part of the train; the auxiliary systems of both electric locomotives and EMUs mainly are powered by one of the two ways, which are either from auxiliary windings of traction transformers or from DC-link voltage of traction converters. Powered by DC-link voltage of traction converters, the auxiliary systems were maintained of uninterruptable power supply with energy from electric braking. Meanwhile, powered by traction transformers, the auxiliary systems were always out of power while passing the neutral section of power supply grid and control system is powered by battery at this time.Design/methodology/approachUninterrupted power supply of auxiliary power system powered by auxiliary winding of traction transformer was studied. Failure reasons why previous solutions cannot be realized are analyzed. An uninterruptable power supply scheme for the auxiliary systems powered by auxiliary windings of traction transformers is proposed in this paper. The validity of the proposed scheme is verified by simulation and experimental results and on-site operation of an upgraded HXD3C type locomotive. This scheme is attractive for upgrading practical locomotives with the auxiliary systems powered by auxiliary windings of traction transformers.FindingsThis scheme regenerates braking power supplied to auxiliary windings of traction transformers while a locomotive runs in the neutral section of the power supply grid. Control objectives of uninterrupted power supply technology are proposed, which are no overvoltage, no overcurrent and uninterrupted power supply.Originality/valueThe control strategies of the scheme ensure both overvoltage free and inrush current free when a locomotive enters or leaves the neutral section. Furthermore, this scheme is cost low by employing updated control strategy of software and add both the two current sensors and two connection wires of hardware.

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