power systems loss

PARALLELING TRANSFORMER’S LOADING CONSIDERATIONS Paralleling transformers has been practiced mostly in commercial and industrial facilities along with electric utilities where reliability and the quality of power is the main objective. For many years, it has been a practice that transformers installed for paralleling have the same kVA, turns ratio and impedances which served also as a reason why most of the engineers today is having a hard time understanding load sharing and circulating currents. Often times during transformer replacement or upgrades, they tend to not know the impact of paralleling transformers with different parameters and could later result to transformer failures. Simple transformer paralleling with the same kVA, turns ratio and impedance is not enough in practicing this kind of activity. An engineer must consider all possible scenarios and simulate the effects of his decisions. The most appropriate type of transformers that should be use in paralleling must have t...

TRANSFORMER PARALLELING TUTORIAL & DOWNLOAD In actual electrical engineering application, sometimes an engineer would sacrifice logic in order for him to achieve a greater purpose. Unlike in theory, actual engineering practice requires decision making situations where we base our decisions on more than just what we compute and what we think as the most correct action. Say for instance in paralleling tansformers, generally, it is not recommended to use two smaller size transformers, to be used in one circuit by paralleling in replacement for using a single full-size transformer with the same capacity with latter set-up. Logically speaking, utilizing two transformers will be more expensive compared to using a single unit transformer both with the same transformation capacity. Not to mention the fact that the combined losses of two transformer will be higher to that of a single transformer especially when it comes to its no-load loss  considerations. Also...