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.

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