Normally in directly earthed and effectively earthed systems every available neutral point is earthed. Deviations from this occurs when the transformers neutral points are left unearthed. This is done to… Read more
Secondary injection tests are always done prior to primary injection tests. The purpose of secondary injection testing is to prove the correct operation of the protection scheme that is downstream… Read more
Distribution transformers (commonly mineral-oil-immersed type) are output rated and their loading and sizing guidelines of many utilities are based on ANSI/IEEE C57.91. Distribution transformers can deliver their rated kVA without…...
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This technical article explains how to calculate and draw a single line diagram of the three-phase, 60-Hz system power system with generators, motors, transformers and lines. The following components comprise… Read more