The development of and field tests on different types of high-voltage overhead traction equipment

1962 ◽  
Vol 109 (4S) ◽  
pp. 257
Author(s):  
C.E. Allen ◽  
A.H. Emerson
Keyword(s):  
High Voltage ◽  
Field Tests ◽  
Different Types ◽  
Traction Equipment

scholarly journals Determination of dV/dt and dI/dt characteristics for high voltage 4H-SiC Schottky diodes with different types of metal-polymeric packages

2020 ◽  
Vol 1679 ◽  
pp. 022045
Author(s):  
S B Rybalka ◽  
E A Kulchenkov ◽  
A A Demidov ◽  
N A Zhemoedov ◽  
A Yu Drakin ◽  
...  
Keyword(s):  
High Voltage ◽  
Schottky Diodes ◽  
Different Types

scholarly journals dV/dt testing of high voltage 4H-SiC Schottky diodes with different types of metal-polymeric packages

2020 ◽  
Vol 1695 ◽  
pp. 012160
Author(s):  
D A Knyginin ◽  
S B Rybalka ◽  
E A Kulchenkov ◽  
A A Demidov ◽  
N A Zhemоedоv ◽  
...  
Keyword(s):  
High Voltage ◽  
Schottky Diodes ◽  
Different Types

scholarly journals State-of-the-Art-Review of Collapsible Soils

2000 ◽  
Vol 5 ◽  
pp. 115 ◽  
Author(s):  
A. A. AL-Rawas
Keyword(s):  
Field Tests ◽  
Clay Content ◽  
Field Testing ◽  
Dry Density ◽  
Foundation Design ◽  
Treatment Methods ◽  
Collapse Potential ◽  
Collapsible Soils ◽  
Different Types ◽  
Compaction Control

Collapsible soils are encountered in arid and semi-arid regions. Such soils cause potential construction problems due to their collapse upon wetting. The collapse phenomenon is primarily related to the open structure of the soil. Several soil collapse classifications based on parameters such as moisture content, dry density, Atterberg limits and clay content have been proposed in the literature as indicators of the soil collapse potential. Direct measurement of the magnitude of collapse, using laboratory and/or field tests, is essential once a soil showed indications of collapse potential. Treatment methods such as soil replacement, compaction control and chemical stabilization showed significant reduction in the settlement of collapsible soils. The design of foundations on collapsible soils depends on the depth of the soil, magnitude of collapse and economics of the design. Strip foundations are commonly used when collapsing soil extends to a shallow depth while piles and drilled piers are recommended in cases where the soil extends to several meters. This paper provides a comprehensive review of collapsible soils. These include the different types of collapsible soils, mechanisms of collapse, identification and classification methods, laboratory and field testing, treatment methods and guidelines for foundation design.

scholarly journals Investigation on the Breakdown Characteristics of Different Types of Lightning Rods

2018 ◽  
Vol 17 (2) ◽  
pp. 1-5
Author(s):  
Noor Azlinda Ahmad ◽  
Rosniza Zainal ◽  
Zuraimy Adzis
Keyword(s):  
Breakdown Voltage ◽  
High Voltage ◽  
Horizontal Distance ◽  
Different Types ◽  
Series Of Experiments ◽  
Voltage Breakdown

This paper investigates the voltage breakdown characteristics of three types of lightning rods - blunt, sharp and flat. The objectives of this study are to determine the voltage breakdown characteristics of various types of lightning rods and to obtain the striking distance of each rod. A series of experiments were conducted in the high voltage laboratory consisting of individual testing rod, competitive testing rod and also horizontal distance changing. All three types of rods have been tested in each experiment in order to obtain a comprehensive result. The blunt rod has been proven as the best strike receptor in comparison to sharp and flat rod. This is because breakdown voltage for blunt rod is much lower (199 kV) than that of flat and sharp rod. Therefore, replacement of widely used sharp rod with the blunt one should be considered in order to provide better protection for buildings from lightning activities. 

scholarly journals Researched the wear resistance of hardened plowshares by electroarc and spot welding

2019 ◽  
pp. 189-196
Author(s):  
M. Vаsylenko ◽  
D. Buslаiev ◽  
O. Kаlinin ◽  
Yu. Kononogov
Keyword(s):  
Wear Resistance ◽  
Wear Rate ◽  
Spot Welding ◽  
Field Tests ◽  
Sandy Soils ◽  
Clay Soils ◽  
Basic Principles ◽  
Data Field ◽  
Different Types ◽  
Analytical Processing

Purpose. The researched of the wear resistance of hardened plowshares by electroarc and abrasion-resistant electrodes, when they are used in soils of different types. Methods. Conducting and planning an experiment, mathematical statistics and analytical processing of experimental data, field tests of experimental plowshares using the basic principles of the theory of friction and abrasive wear. Results. The characteristic defects of shares operating in different types of soils are determined. According to the proposed hardening technology, the wear rate of experimental shares is reduced. Conclusions 1.It has been established that the nature of the parts of tillage machines wear is significantly different when operating on various types of soils. 2.It was found that the wear rate of hardened plowshares for sandy soils is 1.2–1.6 times less than that of serial parts; hardened plowshares for clay soils also have a wear rate of 1.2–1.3 times less than serial ones. Keywords: exploitation, hardfacing, plowshares, soils of different types, wear, wear resistance.

scholarly journals Different Types of Maculopathy in Eyes after a High-Voltage Electrical Shock Injury

2019 ◽  
Vol 10 (1) ◽  
pp. 19-23 ◽  
Author(s):  
Hye Rim Choe ◽  
Un Chul Park
Keyword(s):  
Optical Coherence Tomography ◽  
Visual Acuity ◽  
High Voltage ◽  
Electrical Current ◽  
Final Visit ◽  
Electrical Injury ◽  
Electrical Shock ◽  
Retinal Atrophy ◽  
Different Types ◽  
The Right

Background: We report a case of different types of maculopathy in eyes after a high-voltage electrical shock injury. Case Report: A 43-year-old male suffered high-voltage electrical injury through his left arm. He underwent cataract surgery in both eyes 3 months after the injury, but there was no vision improvement. Ocular examination, including spectral domain optical coherence tomography, revealed diffuse retinal atrophy in the left eye which did not change until the final visit. In the right eye, an impending macular hole was observed but regressed spontaneously 9 months after the injury, and the visual acuity improved to 20/32 at the final visit. Conclusion: Two different types of maculopathy can occur in each eye after high-voltage electrical shock injury, and this might be due to asymmetric pathogenesis of the eyes according to the proximity to the route of electrical current.

Hong Kong Metro's Traction Equipment: The Drive for Efficiency

1992 ◽  
Vol 206 (1) ◽  
pp. 67-74
Author(s):  
A D Moyes
Keyword(s):  
Energy Efficiency ◽  
Hong Kong ◽  
Life Cycle ◽  
Energy Saving ◽  
Mass Transit ◽  
Life Cycle Costs ◽  
Design Features ◽  
Different Types ◽  
Multiple Unit ◽  
Traction Equipment

This paper describes the evolution of the electric multiple unit traction equipment of the Hong Kong Mass Transit Railway Corporation (MTRC). Traction energy efficiency is particularly important to the MTRC and has been improved by 46 per cent on the most recently supplied cars. The justification for the conversion of the existing camshaft cars to chopper control and the relative merits of different types of drives in MTRC's application are discussed. The utilization of energy, the method used to optimize coasting for energy saving, life-cycle costs and the design features of the gate turn-off thyristor chopper cars are described.

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