Technical Analysis of Vehicle Shutdown Accident Caused by Short Circuit of Filter Capacitor in Traction System

2021 ◽  
Keyword(s):  
Short Circuit ◽  
Technical Analysis ◽  
Traction System ◽  
Filter Capacitor

scholarly journals Inductive influence of 25 kV, 50 Hz electrified single rail traction system

2018 ◽  
Vol 180 ◽  
pp. 06004
Author(s):  
Bosko Milesevic ◽  
Ivo Uglesic
Keyword(s):  
Short Circuit ◽  
Short Circuit Current ◽  
Induced Voltage ◽  
Metallic Structures ◽  
Railway System ◽  
Supply Current ◽  
Traction System ◽  
Current Calculation ◽  
Inductive Interference

The paper presents the methodology for calculation and measurement of induced voltage caused by railway system operation on the sensitive metallic structures. The arrangement and characteristics of railway system 25 kV, 50 Hz are provided. The procedures of short-circuit current calculation and supply current measurement in the railway system are described. The basic theoretic background of inductive interference is explained. The reduction factors of the communication cable, railway system and environment are mentioned and clarified. On a case study, the results of the induced voltage calculation and measurement is compared. It is proved that induced voltage directly depends of supply current or shortcircuit value.

scholarly journals Sistem Proteksi Power Supply Modul Praktikum Teknik Digital

2015 ◽  
Vol 2 (3) ◽  
pp. 156
Author(s):  
Anwar Mujadin
Keyword(s):  
Response Time ◽  
Power Supply ◽  
Electronic Circuit ◽  
Short Circuit ◽  
Protection System ◽  
Capacitor Discharge ◽  
Voltage Comparator ◽  
Filter Capacitor ◽  
Experiment Module

<p><em>Abstrak<strong> – </strong></em><strong><em>Dalam melakukan praktikum teknik digital berbasis protoboard kadangkala pihak pengguna melakukan kesalahan fatal yaitu terjadi hubung singkat power supply dalam interkoneksi. Untuk menghindari kerusakan power supply akibat hubung singkat dalam modul praktikum digital, diperlukan sebuah rangkaian elektronika yang mampu mendeteksi dan memutus arus  sumber (power supply) dengan segera pada saat terjadi hubung singkat.</em></strong> <strong><em>Modul praktikum teknik digital dalam penelitian ini telah dilengkapi dengan sistem proteksi power supply dari hubung singkat dengan waktu tanggap kurang dari 5 ms, menggunakan teknis waktu jeda pengosongan kapasitor dan opamp pembanding tegangan.</em></strong><strong><em> </em></strong></p><p><strong><em> </em></strong></p><p><em>Abstract<strong> – When conducting experiments practicum in digital protoboard base project, users often made a fatal mistake that cause short circuit interconnection. To avoid damaging the power supply of experiment module (hardware), it requires an electronic circuit that is able to detect and cut off the main power supply immediately. In research the modular lab has been equipped with an electronics short circuit protection system with a response time of less than 5 ms, using capacitor discharge and opamp voltage comparator technique. </strong></em></p><p><strong><em> </em></strong></p><p><strong><em>Keyword – </em></strong><em>RC Transient, Power Supply Protection</em><em> Systems, Bypass Filter Capacitor.</em></p>

scholarly journals Interrupting Short-Circuit Direct Current Using an AC Circuit Breaker in Series with a Reactor

2012 ◽  
Vol 2012 ◽  
pp. 1-14 ◽  
Author(s):  
Saurabh Kulkarni ◽  
Surya Santoso
Keyword(s):  
Direct Current ◽  
Selection Criteria ◽  
Short Circuit ◽  
Circuit Breaker ◽  
Fault Current ◽  
Overcurrent Protection ◽  
Dc Fault ◽  
Rlc Circuit ◽  
In Series ◽  
Filter Capacitor

This paper describes and demonstrates the principle and efficacy of a novel direct current fault interruption scheme using a reactor in series with a controlled rectifier and a conventional AC circuit breaker. The presence of the series reactor limits the capacitive discharge current from the DC filter capacitor at the output terminals of the phase-controlled rectifier. In addition, the series reactor along with the filter capacitor forms an underdamped series RLC circuit which forces the fault current to oscillate about zero. This synthetic alternating current can then be interrupted using a conventional AC circuit breaker. The selection criteria for the series reactor and overcurrent protection are presented as well. Using the proposed scheme for an example case, a DC fault current magnitude is reduced from 56 kA to 14 kA, while the interruption time is reduced from 44 ms to 25 ms.

Structural Imperfections in thin Oxide Films Formed on Some Fe- and Ni-Base Alloys

1970 ◽  
Vol 28 ◽  
pp. 510-511
Author(s):  
L. P. Lemaire ◽  
D. E. Fornwalt ◽  
F. S. Pettit ◽  
B. H. Kear
Keyword(s):  
Oxide Scale ◽  
Oxidation Process ◽  
Short Circuit ◽  
Protective Oxide ◽  
Protective Oxide Scale ◽  
Thin Oxide Films ◽  
Diffusion Paths ◽  
Oxidation Resistant ◽  
Structural Imperfections ◽  
Short Circuit Diffusion

Oxidation resistant alloys depend on the formation of a continuous layer of protective oxide scale during the oxidation process. The initial stages of oxidation of multi-component alloys can be quite complex, since numerous metal oxides can be formed. For oxidation resistance, the composition is adjusted so that selective oxidation occurs of that element whose oxide affords the most protection. Ideally, the protective oxide scale should be i) structurally perfect, so as to avoid short-circuit diffusion paths, and ii) strongly adherent to the alloy substrate, which minimizes spalling in response to thermal cycling. Small concentrations (∼ 0.1%) of certain reactive elements, such as yttrium, markedly improve the adherence of oxide scales in many alloy systems.

Short Circuit Currents of Normal and Crohn's Diseased Human Colonic Mucosa

Endoscopy ◽  
2006 ◽  
Vol 38 (11) ◽  
Author(s):  
A Patel ◽  
DL Bovell ◽  
AD Corbett ◽  
RJ Holdsworth
Keyword(s):  
Colonic Mucosa ◽  
Short Circuit ◽  
Short Circuit Currents
Sign in / Sign up

Export Citation Format

Share Document