Influence of the ground impedance on the earth fault current calculation in lengthy electrical networks containing harmonic sources

2008 ◽  
Author(s):  
A. Novitskiy ◽  
H. Schau
Keyword(s):  
Fault Current ◽  
Electrical Networks ◽  
Earth Fault ◽  
The Earth ◽  
Current Calculation

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.

Analysis of the Earth Fault Distance Measuring Units Algorithms Operation

2019 ◽  
Author(s):  
Tatjana Lomane ◽  
Kristina Berzina ◽  
Inga Zicmane ◽  
Sergejs Rubcovs ◽  
Renata Varfolomejeva ◽  
...  
Keyword(s):  
Earth Fault ◽  
The Earth ◽  
Distance Measuring
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