Determination of Parameters of Zero-Sequence Equivalent Circuits for Three-Phase Three-Legged YNynd Transformers Based on Onsite Low-Voltage Tests

2013 ◽  
Vol 28 (3) ◽  
pp. 1618-1625 ◽  
Author(s):  
A. Ramos ◽  
J. C. Burgos ◽  
A. Moreno ◽  
E. Sorrentino
Keyword(s):  
Low Voltage ◽  
Equivalent Circuits ◽  
Three Phase ◽  
Zero Sequence ◽  
Determination Of Parameters

On-Site Low Voltage Determination of Zero-Sequence Impedances for Power Transformers

2020 ◽  
Vol 35 (2) ◽  
pp. 1048-1057
Author(s):  
Haytham Saeed ◽  
Mariana Kamel ◽  
Abdelrahman Karrar ◽  
Ahmed H. Eltom ◽  
Mark Bowman
Keyword(s):  
Low Voltage ◽  
Power Transformers ◽  
Zero Sequence

scholarly journals DETERMINATION OF OPTIMAL CHARACTERISTICS OF DEVICES FOR VOLTAGE UNBALANCE REDUCING IN LOW VOLTAGE ELECTRIC NETWORKS

2020 ◽  
Vol 2020 (6) ◽  
pp. 43-46
Author(s):  
A.F. Zharkin ◽  
◽  
S.O. Palachov ◽  
A.G. Pazieiev ◽  
D.O. Malakhatka ◽  
...  
Keyword(s):  
Simulation Modeling ◽  
Low Voltage ◽  
Electric Energy ◽  
Electrical Safety ◽  
Electric Networks ◽  
Voltage Unbalance ◽  
Zero Sequence ◽  
Unbalanced Loads

Ways of searching for optimal ways to improve the quality of electric energy in electric networks with dispersed unbalanced loads using zero-sequence current filters are considered, which take into account the possibility of ensuring the desired performance with minimal cost and taking into account the peculiarities of operation in emergency network conditions and ensuring electrical safety of consumers. Corresponding calculations were carried out using simulation modeling. References 6, figures 4.

On-site low voltage determination of zero sequence impedances for station auxiliary transformers

2016 ◽  
Author(s):  
Mariana Kamel ◽  
Haytham Saeed ◽  
Abdelrahman Karrar ◽  
Ahmed Eltom ◽  
Mark Bowman ◽  
...  
Keyword(s):  
Low Voltage ◽  
Zero Sequence

Leakage Failure and Principle of Underground Low Voltage Grid

2012 ◽  
Vol 214 ◽  
pp. 254-258
Author(s):  
Jun Mei Geng ◽  
Chun Guang Li
Keyword(s):  
Low Voltage ◽  
Leakage Detection ◽  
Grounding System ◽  
Arc Suppression Coil ◽  
Detection Program ◽  
Three Phase ◽  
Zero Sequence ◽  
Power Direction ◽  
Leakage Failure ◽  
Zero Sequence Voltage

To describe the leakage protection of underground low voltage grid are based on zero-sequence voltage and zero sequence power direction of the current leakage protection and earth leakage protection based on the additional DC power supply two kinds. The paper gives the theoretical analysis of these two kinds of leakage, and unified the three-phase neutral point grounding system and by arc suppression coil grounding the under compensation leakage detection program, that provides a new approach for underground leakage detection.

scholarly journals Voltage Unbalance Reduction of a Local Transformer Area with Domestic Asymmetrical Inverter and Optimal Control Design

2015 ◽  
Vol 12 (2) ◽  
Keyword(s):  
Low Voltage ◽  
Distribution Networks ◽  
Point Of View ◽  
Voltage Transformer ◽  
Voltage Unbalance ◽  
Three Phase ◽  
Sequence Components ◽  
Zero Sequence ◽  
Source Voltage ◽  
Energy Transportation

The three-phase unbalance problem can introduce additional losses in distribution networks due to both negative and zero sequence components, which leads to inefficient power consumption and increased CO2 emission of low voltage transformer area, moreover it causes safety possible malfunction of energy transportation networks. The aim of this paper is to introduce a new voltage unbalance indicator and a control algorithm that compensates source voltage unbalances. To examine the available measures of voltage asymmetry and make a comparison from the transient behaviours point of view. Analytical and simulation, results are presented to illustrate the effectiveness of the new techniques.

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