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 A Novel Overcurrent Suppression Strategy during Reclosing Process of MMC-HVDC

2019 ◽  
Vol 9 (9) ◽  
pp. 1737 ◽  
Author(s):  
Bin Jiang ◽  
Yanfeng Gong
Keyword(s):  
Transmission Lines ◽  
Short Circuit ◽  
Current Method ◽  
Short Circuit Current ◽  
Simulation Software ◽  
Fault Current ◽  
Overhead Lines ◽  
Hvdc System ◽  
Electromagnetic Transient Simulation ◽  
Current Calculation

A modular multilevel converter based high-voltage DC (MMC-HVDC) system has been the most promising topology for HVDC. A reclosing scheme is usually configured because temporary faults often occur on transmission lines especially when overhead lines are used, which often brings about an overcurrent problem. In this paper, a new fault current limiter (FCL) based on reclosing current limiting resistance (RCLR) is proposed to solve the overcurrent problem during the reclosing process. Firstly, a mesh current method (MCM) based short-circuit current calculation method is newly proposed to solve the fault current calculation of a loop MMC-HVDC grid. Then the method to calculate the RCLR is proposed based on the arm current to limit the arm currents to a specified value during the reclosing process. Finally, a three-terminal loop MMC-HVDC test grid is constructed in the widely used electromagnetic transient simulation software PSCAD/EMTDC and the simulations prove the effectiveness of the proposed strategy.

The Building of Offshore Facilities Power System’s Equivalent Circuit Model

2011 ◽  
Vol 219-220 ◽  
pp. 648-651
Author(s):  
Hong Zhang ◽  
Xu Hui Ma ◽  
Xiu Ye Yin
Keyword(s):  
Power System ◽  
Equivalent Circuit ◽  
System Development ◽  
Short Circuit ◽  
Recursive Algorithm ◽  
Equivalent Circuit Model ◽  
Short Circuit Current ◽  
Circuit Model ◽  
Calculation Process ◽  
Current Calculation

With the development of technology, the power system of offshore facilities (for short: power system) is increasingly complex, short-circuit current calculation process also becomes more complex. The simple recursive algorithm can not meet the requirements of short-circuit current calculation in complex power system. The paper, basing on the principle of short-circuit current calculation, taking modeling ideas, created an equivalent circuit model of power system for short-circuit current calculation. The equivalent circuit model can be used to simplify the progress of calculation and meet the needs of the power system development.

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