Development of Wavelength Converter for Arc Light Detection

Hayasaka, Takamasa; Shimizu, Mitsuaki; Akagi, Hirofumi

doi:10.1541/ieejias.134.618

Cited by 4 publications

(4 citation statements)

References 1 publication

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“…An arc discharge occurs in a pantograph because of the opening of the contact wire and contact strip. The contact wire and contact strip are melted by the arc discharge . A decrease in equipment efficiency occurs because of the erosion of the electrode .…”

Section: Re‐strike Phenomenon Analysis For DC Circuit Breaker and Elementioning

confidence: 99%

Review of Thermal Plasma Simulation Technique

Tanaka

Fujino

Iwao

2019

IEEJ Transactions Elec Engng

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The thermal plasma is widely used for power applications such as circuit breakers, welding, cutting, material processing, waste treatment, and recycling. Transient and three-dimensional simulations have recently been conducted, assisting in the understanding of physical phenomena through new developments in computers and calculation methods. In this review, a thermal plasma simulation technique is described. Specifically, the modeling of a new type of inductively coupled thermal plasma, a radiation transfer analysis of thermal plasma in a gas circuit breaker, and plasma movement of arc welding, DC circuit breakers, electric trains, vacuum circuit breakers, and surface treatment affected by an electromagnetic force are described.

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Section: Re‐strike Phenomenon Analysis For DC Circuit Breaker and Elementioning

confidence: 99%

Review of Thermal Plasma Simulation Technique

Tanaka

Fujino

Iwao

2019

IEEJ Transactions Elec Engng

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“…There are various types of arc-detection measurement systems currently on the market in Japan. They include, for example, a visible-light detecting system that uses a plastic optical fiber for the arc light path, and an ultraviolet-detecting system that uses a wavelength converter with an interference filter and fluorescent glass attached to the head of a plastic optical fiber 6 (referred to as the unit type here after), and an ultraviolet detection system without any plastic optical fiber (referred to as the UV detection type here after). Ultraviolet detection systems are becoming increasingly popular because they are not influenced by sunlight.…”

Section: Arcing Due To Contact Loss and Measurement Systemmentioning

confidence: 99%

An arc-light-based method for estimation of contact strip wear

Hayasaka

Shimizu

Akagi

2015

Proceedings of the Institution of Mechanical Engineers, Part F:

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A measured contact-loss ratio is used to estimate current-collection performance. There are two types of methods used to estimate the contact-loss ratio. One is to measure all the contact losses, including small ones; the other is to measure only contact losses that are greater than 5 ms in duration. The extent of wear of a contact strip caused by arc discharges varies as a function of the amount of electric charge. This fact makes it possible to manage the wear on a contact strip. This paper shows a calculation method for the amount of electric charge based on the output of a contact-loss measurement as well as the expected lifetime of the contact strip and the creation of a maintenance threshold level for of the contact strip.

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“…Separation between contact strip and contact wire is called pantograph bounce; when pantograph bounce happens during current collection, arc discharge occurs between contact strip and contact wire. This discharge is a high‐temperature free arc with complex movement of positive column, cathode spot, and anode spot; as a result, melting and evaporation occur in the contact strip, contact wire, and other current collection parts to cause erosion 1,2 . Such erosion contributes to wear of the current collection parts; in the worst case, cracks in the pantograph or breakage of contact wire may occur 3 …”

Section: Introductionmentioning

confidence: 99%

“…This discharge is a hightemperature free arc with complex movement of positive column, cathode spot, and anode spot; as a result, melting and evaporation occur in the contact strip, contact wire, and other current collection parts to cause erosion. 1,2 Such erosion contributes to wear of the current collection parts; in the worst case, cracks in the pantograph or breakage of contact wire may occur. 3 In order to avoid such erosion and breakage, one needs to clarify underlying mechanisms, and research has been conducted toward explanation of physical phenomena that occur before and after disconnection arc.…”

Section: Introductionmentioning

confidence: 99%

Development of calculation method for melting amount mass of contact wire caused by melting and evaporation of molten metal bridge and arc generation

Morishita

Maeda

Ren

et al. 2022

Electrical Engineering Japan

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As the mileage of the electric railway increases, the unevenness of the contact wire may separate the contact wire and the contact strip. Simultaneously, a disconnection arc discharge is generated by the molten metal bridge. This causes the contact wire to melt and evaporate causing it to break. A few studies have conducted experiments to prevent the contact wire from disconnecting. Based on the results thus obtained, they presented their hypotheses considering conditions sch as the current and time required for melting and evaporation of molten metal bridge and arc generation. In this study, a calculation method for the melting and disconnection phenomenon of the contact wire. Its mass increased when the currents from both sides of the contact wire were taken into consideration. Therefore, we obtained that the convection and radiation play an improtant role for calculation of the melting amount mass of contact wire.

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Development of Wavelength Converter for Arc Light Detection

Cited by 4 publications

References 1 publication

Review of Thermal Plasma Simulation Technique

Review of Thermal Plasma Simulation Technique

An arc-light-based method for estimation of contact strip wear

Development of calculation method for melting amount mass of contact wire caused by melting and evaporation of molten metal bridge and arc generation

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