Power system fault analysis
Power system fault calculations are invariably undertaken using the mathematical technique termed `symmetrical components' analysis (alternatively termed `phase-sequence components' analysis). A wealth of literature exists on this subject and therefore the purpose of this text is to provide an abbreviated, concise and relevant explanation focusing on fundamental concepts and practical requirements relevant to power network construction. There are numerous computer-based systems available for undertaking power system fault calculations, but instances arise in practice of where it is much quicker and convenient to undertake hand calculations (with the aid of a calculator), or even to carry out hand calculations as a rough check to provide assurance that a computer calculation is correct (since computer output depends on correct data input). Furthermore, the ability to undertake hand calculations most importantly requires a mastery of the principles and concepts involved. This in turn leads to an in-built understanding of comparative equipment impedances and the typical current flows that arise on the power system, i.e. an appreciation of numbers, scale and size. Suffice it to say that where an analysis of an extensive or complex part of the power system is concerned - then in those instances recourse to a computer-based solution is invariably essential.
Power system fault analysis, Page 1 of 2
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