scholarly journals Voltage distribution indices method to analyse the performance of various structures of stray current collectors in direct current transit lines

2021 ◽  
Author(s):  
Ebrahim Zare Juybari ◽  
Reza Keypour ◽  
Mohsen Niasati
Keyword(s):  
Direct Current ◽  
Voltage Distribution ◽  
Stray Current ◽  
Current Collectors

scholarly journals Voltage Protection and Harmonics Cancellation in Low Voltage Distribution Network

2018 ◽  
Vol 7 (04) ◽  
pp. 01-07
Author(s):  
Prof. Amruta Bijwar, Prof. Madhuri Zambre
Keyword(s):  
Direct Current ◽  
Current Distribution ◽  
Low Voltage ◽  
Distribution Network ◽  
Control Unit ◽  
Future Generation ◽  
Distribution Networks ◽  
Current Control ◽  
Voltage Distribution ◽  
Monitor Function

Nowadays low voltage distribution network is considered as worldwide future generation distribution network. But the major concern is harmonics generation and steps taken to cancel those harmonics. In our proposed work, low voltage distribution network is designed with low voltage and harmonics are cancelled in our method. The combination of current control unit and voltage control unit will give extra reliable power solution to increase the required capacity of low voltage grids. The high voltage protection gears are used in worst environment for low voltage and low current distribution network test is preferable to assess a variety of operation uniqueness. Therefore, it has few restrictions in implementation of economic in addition to process methodologies. In our work a 48V direct current base up-scale low voltage distribution network test is urbanized to allow the copy and surveillance of a variety of phenomenon of direct current distribution networks. The proposed system provide stretchy pattern ability by introduce S-connectors and T-connectors module that will be proscribed distantly, and near real time monitor function through by means of a data acquisition system associated toward the nodes. Each connector be able to calculate Power, Voltage and current with up to 250 kHz frequency. To calculate power quality and to understand the performance of the distribution network, frequency analysis is required along with collected data.

scholarly journals Analysis of rail potential and stray current in MVDC railway electrification system

2021 ◽  
Author(s):  
Salman Aatif ◽  
Haitao Hu ◽  
Fezan Rafiq ◽  
Zhengyou He
Keyword(s):  
Quantitative Analysis ◽  
Simulation Model ◽  
Direct Current ◽  
High Speed ◽  
Safe Distance ◽  
Stray Current ◽  
Long Distance ◽  
Medium Voltage ◽  
Traction Substations ◽  
Train Loading

AbstractIn contrast to the conventional direct current railway electrification system (DC-RES), the medium voltage direct current (MVDC)-RES is considered promising for long-distance high-speed corridors. In the MVDC-RES, traction substations (TSSs) are placed much farther and train loads are much heavier than in the conventional DC-RES. Hence, the MVDC-RES brings a drastic change in catenary voltage, TSS spacing, and train loading, which affects rail potential and stray current. In this connection, this work performs some significant quantitative analysis of rail potential and stray current in the MVDC-RES environment. An MVDC simulation model is proposed and different grounding schemes are analyzed for a single-train and two TSSs scenario as well as for a multi-train multi-TSS scenario. According to the simulation and analysis, the maximum values of rail potential and stray current at MVDC-RES distances and the maximum safe distance between adjacent TSSs are determined.

Study on interference and protection of pipeline due to high-voltage direct current electrode

2019 ◽  
Vol 37 (3) ◽  
pp. 273-281 ◽  
Author(s):  
Yang Chao ◽  
Li Jianliang ◽  
Li Zili ◽  
Zhang Shouxin ◽  
Dai Long ◽  
...  
Keyword(s):  
High Voltage ◽  
Direct Current ◽  
Cathodic Protection ◽  
Current Source ◽  
Buried Pipelines ◽  
Stray Current ◽  
Current Electrode ◽  
Protective Measures ◽  
High Voltage Direct Current ◽  
Pipe Section

AbstractTo study the rules of interference and protective measures on buried pipelines of high-voltage direct current (HVDC), the influence of different factors, including current into soil, soil resistance, damaged rate of coatings, and electrode-to-pipe distance, on pipe-to-soil potential deviation were simulated. Based on the simulated results, the fitted equations and interference judgment pattern were also obtained. The protective measures of insulation and cathodic protection can be performed for buried pipelines to prevent the interference, but the cathodic protection in the isolated area may become the stray current source of the other pipe section. This study can provide suggestions for the evaluation of interference and protective measures of pipelines of HVDC.

Artificial Insulating Joints for Stray Current Mitigative Measurements★

CORROSION ◽  
1957 ◽  
Vol 13 (10) ◽  
pp. 18-20
Author(s):  
G. H. CANTWELL
Keyword(s):  
Direct Current ◽  
Carrying Capacity ◽  
Current Source ◽  
Electrical Measurements ◽  
Stray Current ◽  
The Earth

Abstract In making electrical measurements pertinent to determining stray current mitigative measures, it is often desirable to determine the effect of a proposed insulating joint at a predetermined location. By applying a direct current source between the structure and the earth in the manner described in this paper, simulation of an insulating joint is achieved. Since the method is entirely electrical, the placing of temporary insulating joints for test purposes is eliminated. This method can be applied to any structure carrying stray DC earth currents. In addition to simulating an insulating joint, the associated current and potential measurements are used to determine (1) the resistance to earth of the structure on each side of the point of application, (2) the potential to earth that would exist on each side of a permanent insulating joint, (3) the potential across the permanent insulating joint. They also provide data for determining the resistance and current carrying capacity for a bridging resistor. 4.5.3

Stray Current Simulation Models for Direct Current Transit System: An Industry Perspective

2015 ◽  
Author(s):  
Saud Memon ◽  
Paul Fromme
Keyword(s):  
Direct Current ◽  
Simulation Models ◽  
Stray Current ◽  
Transit System ◽  
Transit Systems ◽  
Current Leakage ◽  
The Impact ◽  
Modeling Principles

This paper presents and evaluates the different modeling principles developed, and in use, to control stray current leakage for Direct Current (dc) powered transit systems. The aim is to understand the stray current simulation models, explain their limitations, and to understand the impact on stray current leakage due to different grounding schemes adopted by the dc powered transit operators.

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