Overvoltages After Current Chopping in a Three-Phase Inductive Circuit with Isolated Neutral

1981 ◽  
Vol PER-1 (12) ◽  
pp. 27-28
Author(s):  
W. M. C. van den Heuvel
Keyword(s):  
Three Phase ◽  
Inductive Circuit ◽  
Isolated Neutral

scholarly journals Differential method for damage location determining in 10 kV distribution networks with isolated neutral

2019 ◽  
Vol 124 ◽  
pp. 01003
Author(s):  
V. Kozlov ◽  
E. Kirzhatskikh ◽  
R. Giniatullin
Keyword(s):  
Transmission Lines ◽  
Short Circuit ◽  
Distribution Networks ◽  
Differential Method ◽  
Medium Voltage ◽  
Damage Location ◽  
Damage Repair ◽  
Three Phase ◽  
Isolated Neutral ◽  
Emergency Mode

Half of the length of all transmission lines (TL) are medium voltage networks. Single-line-to-ground short circuit (SLGSC) in distribution networks is the most common type of damage, accounting up to 70% of all types of damage. Faults in damage repair leads to an overvoltage of two healthy phases, resulting in double shorts, two-, three-phase shorts, which contributes to consumers’ disconnection. Remote damage location (DL) determination in tree-type networks is considered to be the most relevant, since these networks are spread over large areas, crossing rivers, ravines, lakes, forests, etc. This paper presents a differential method for DL determining based on steady-state voltage of damaged phase frequency. Measuring the parameters of emergency mode at the beginning and at the ends of 10kV TL allows compact stand-alone sensors using without their synchronization.

Inrush current mitigation in three-phase transformers with isolated neutral

2015 ◽  
Vol 121 ◽  
pp. 14-19 ◽  
Author(s):  
Ramón Cano-González ◽  
Alfonso Bachiller-Soler ◽  
José Antonio Rosendo-Macías ◽  
Gabriel Álvarez-Cordero
Keyword(s):  
Inrush Current ◽  
Three Phase ◽  
Isolated Neutral

STUDY OF ELECTROCUTION HAZARDS IN THREE-PHASE ELECTRICAL NETWORKS WITH GROUND-ISOLATED NEUTRAL POINT

2012 ◽  
Vol 11 (7) ◽  
pp. 1267-1271 ◽  
Author(s):  
Vlad Pasculescu ◽  
Dragos Pasculescu ◽  
Leonard Lupu ◽  
Ioan Inisconi ◽  
Marius Suvar
Keyword(s):  
Neutral Point ◽  
Electrical Networks ◽  
Three Phase ◽  
Isolated Neutral

scholarly journals The numerical method of inverse Laplace transform for calculation of overvoltages in power transformers and test results

2014 ◽  
Vol 11 (2) ◽  
pp. 243-256 ◽  
Author(s):  
Jovan Mikulovic ◽  
Tomislav Sekara
Keyword(s):  
Laplace Transform ◽  
Numerical Method ◽  
Power Transformer ◽  
Neutral Point ◽  
Inverse Laplace Transform ◽  
Method Of Calculation ◽  
Distributed Parameters ◽  
Three Phase ◽  
Calculation Results ◽  
Isolated Neutral

A methodology for calculation of overvoltages in transformer windings, based on a numerical method of inverse Laplace transform, is presented. Mathematical model of transformer windings is described by partial differential equations corresponding to distributed parameters electrical circuits. The procedure of calculating overvoltages is applied to windings having either isolated neutral point, or grounded neutral point, or neutral point grounded through impedance. A comparative analysis of the calculation results obtained by the proposed numerical method and by analytical method of calculation of overvoltages in transformer windings is presented. The results computed by the proposed method and measured voltage distributions, when a voltage surge is applied to a three-phase 30 kVA power transformer, are compared.

Test of the stability of a three-phase contact line with negative line tension

1999 ◽  
Vol 96 (9) ◽  
pp. 1335-1339 ◽  
Author(s):  
ALAN E. VAN GIESSEN, DIRK JAN BUKMAN, B.
Keyword(s):  
Contact Line ◽  
Line Tension ◽  
Phase Contact ◽  
Three Phase ◽  
The Stability
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